{ "id": "d10490c5b7ae872d80dd9d49d397dd4fc0be1b37", "text": "METEOROLOGICAL JOURNAL,\n\nKEPT BY THE ASSISTANT SECRETARY\n\nAT THE APARTMENTS OF THE\n\nROYAL SOCIETY,\n\nBY ORDER OF\n\nTHE PRESIDENT AND COUNCIL.\n\nMDCCCXXX.\n## METEOROLOGICAL JOURNAL FOR JANUARY, 1830.\n\n| 1830. January | 9 o'clock, A.M. | 3 o'clock P.M. | Dew Point at 9 A.M. in degrees of Fahr. | External Thermometer | Rain, in inches. Read off at 9 A.M. | Direction of the Wind at 9 A.M. | Remarks |\n|---------------|----------------|----------------|----------------------------------------|---------------------|-----------------------------------|-------------------------------|---------|\n| | Barom. Attach. Therm. | Barom. Attach. Therm. | Fahrenheit. Lowest. Highest. | Self-registering. Lowest. Highest. | | | |\n| ♀ 1 | 30.631 | 31.5 | 30.605 | 33.2 | 27 | 31.8 | 33.5 | 28.5 | 33.5 | SE | Overcast—light wind. |\n| ♀ 2 | 30.510 | 32.8 | 30.486 | 34.0 | 24 | 30.8 | 32.8 | 29.4 | 32.8 | NE | Overcast—light brisk wind. |\n| ♀ 3 | 30.426 | 34.9 | 30.412 | 36.2 | 29 | 34.9 | 36.0 | 29.5 | 36.0 | S | Overcast and foggy. |\n| ♀ 4 | 30.273 | 36.0 | 30.237 | 37.0 | 29 | 37.2 | 37.8 | 31.8 | 37.8 | 0.236 | Foggy—light rain. |\n| ♀ 5 | 30.257 | 36.9 | 30.237 | 38.5 | 35 | 36.0 | 40.5 | 34.3 | 40.5 | 0.194 | Overcast and foggy—light wind. |\n| ♀ 6 | 30.367 | 35.3 | 30.248 | 36.4 | 31 | 31.4 | 35.0 | 28.7 | 38.7 | NW | Overcast and foggy—light wind. |\n| ♀ 7 | 29.805 | 38.6 | 29.834 | 40.5 | 38 | 39.7 | 40.8 | 30.3 | 42.7 | 0.017 | A.M. Foggy. P.M. Fine—light haze. |\n| ♀ 8 | 30.055 | 37.3 | 30.039 | 38.5 | 33 | 35.3 | 36.8 | 33.3 | 36.8 | 0.008 | Snow, early A.M. Overcast—light wind. |\n| ♀ 9 | 30.179 | 36.8 | 30.033 | 38.6 | 32 | 34.3 | 36.7 | 32.2 | 38.7 | 0.014 | NNW | Lightly cloudy and hazy. |\n| ♀ 10 | 29.781 | 37.6 | 29.759 | 38.2 | 22 | 35.4 | 37.3 | 33.3 | 37.3 | 0.019 | Clear and cloudless—light brisk wind. |\n| ♀ 11 | 29.690 | 36.3 | 29.576 | 37.8 | 27 | 35.1 | 36.0 | 33.3 | 36.4 | WNW | Fine—light clouds and brisk wind. |\n| ♀ 12 | 29.784 | 34.7 | 29.875 | 36.2 | 29 | 31.9 | 33.0 | 30.4 | 33.0 | 0.025 | Overcast—snow in large flakes. |\n| ♀ 13 | 29.880 | 33.7 | 29.242 | 34.4 | 27 | 31.6 | 31.8 | 29.6 | 31.8 | 0.081 | Snow—light wind. |\n| ♀ 14 | 29.878 | 31.4 | 29.885 | 31.4 | 24 | 29.2 | 29.0 | 25.4 | 31.7 | 0.011 | Overcast—light wind. |\n| ♀ 15 | 29.909 | 33.7 | 29.842 | 34.8 | 30 | 32.6 | 34.8 | 27.7 | 34.8 | E | Overcast—light rain and wind. |\n| ♀ 16 | 29.907 | 33.4 | 29.944 | 34.2 | 30 | 31.7 | 30.8 | 28.3 | 32.4 | 0.033 | Overcast—light rain with brisk wind. |\n| ♀ 17 | 29.880 | 30.2 | 29.883 | 30.7 | 16 | 24.7 | 24.7 | 21.3 | 24.7 | 0.019 | Overcast. |\n| ♀ 18 | 29.970 | 27.8 | 29.911 | 27.2 | 19 | 21.3 | 23.8 | 20.3 | 23.8 | NE | Lightly cloudy and foggy. |\n| ♀ 19 | 29.688 | 25.3 | 29.557 | 27.2 | 19 | 20.4 | 27.5 | 17.2 | 31.4 | ESE | Hazy—light wind. Strong fog A.M. |\n| ♀ 20 | 28.727 | 30.0 | 28.631 | 33.2 | 30 | 32.7 | 35.5 | 19.4 | 35.5 | ESE | Hazy—light wind. Snow early A.M. |\n| ♀ 21 | 29.353 | 32.3 | 29.435 | 34.8 | 32 | 32.5 | 35.8 | 28.7 | 36.0 | SW | Fine—light haze and wind. |\n| ♀ 22 | 29.590 | 37.5 | 29.641 | 37.9 | 34 | 35.3 | 36.2 | 31.6 | 36.2 | 0.017 | Overcast—light wind. Rain A.M. |\n| ♀ 23 | 29.872 | 37.3 | 29.847 | 37.0 | 32 | 32.7 | 35.4 | 31.3 | 35.4 | 0.097 | A.M. Snow. P.M. Rain—light wind. |\n| ♀ 24 | 29.888 | 36.8 | 29.933 | 38.9 | 34 | 35.4 | 38.7 | 31.7 | 38.7 | 0.036 | Foggy. |\n| ♀ 25 | 30.250 | 37.8 | 30.307 | 39.5 | 33 | 35.5 | 38.4 | 34.2 | 38.4 | N | A.M. Hazy. P.M. Fine and clear. |\n| ♀ 26 | 30.316 | 38.3 | 30.332 | 38.5 | 34 | 35.7 | 37.0 | 33.6 | 37.0 | E | Overcast and foggy—light wind. |\n| ♀ 27 | 29.873 | 38.6 | 29.787 | 39.2 | 35 | 35.3 | 37.5 | 34.2 | 37.5 | NW | A.M. Foggy—snow. P.M. Light rain. |\n| ♀ 28 | 30.076 | 39.6 | 30.134 | 39.5 | 35 | 35.3 | 36.7 | 33.6 | 36.7 | 0.278 | Overcast—light haze and wind. |\n| ♀ 29 | 30.211 | 39.5 | 30.202 | 39.8 | 35 | 35.3 | 35.6 | 33.6 | 35.6 | 0.167 | Overcast and foggy—light wind. |\n| ♀ 30 | 29.949 | 38.3 | 29.888 | 39.6 | 34 | 35.0 | 38.2 | 31.6 | 38.2 | NNW | Overcast—A.M. Snow, early. P.M. Light rain. |\n| ♀ 31 | 30.083 | 31.3 | 30.059 | 30.8 | 17 | 22.6 | 23.6 | 21.4 | 23.6 | 0.131 | A.M. Snow. P.M. Fine—light clouds and wind. |\n\n**Mean**\n\n| Mean | Mean | Mean | Mean | Mean | Mean | Mean | Mean | Sum |\n|------|------|------|------|------|------|------|------|-----|\n| 29.970 | 34.9 | 29.926 | 35.9 | 29.2 | 32.5 | 34.4 | 29.3 | 35.0 | 1,919 |\n\nMonthly Mean of the Barometer, corrected for Capillarity and reduced to 32° Fahr. ............... { 9 A.M. 3 P.M. } { 29.966 29.919 }\n\n### OBSERVANDA.\n\nHeight of the Cistern of the Barometer above a Fixed Mark on Waterloo Bridge ......................... =83 feet 2½ in.\n\n.............................................................. above the mean level of the Sea (presumed about) ........ =95 feet.\n\nThe External Thermometer is 2 feet higher than the Barometer Cistern.\n\nHeight of the Receiver of the Rain Gauge above the Court of Somerset House ......................... =79 feet 0 in.\n\nThe hours of observation are of Mean Time, the day beginning at Midnight.\n\nThe Thermometers are graduated by Fahrenheit's Scale.\n\nThe Barometer is divided into inches and decimals.\n## METEOROLOGICAL JOURNAL FOR FEBRUARY, 1830.\n\n| 1830. February | 9 o'clock, A.M. | 3 o'clock, P.M. | Dew Point at 9 A.M. in degrees of Fahr. | External Thermometer | Rain, in inches. Read off at 9 A.M. | Direction of the Wind at 9 A.M. | Remarks |\n|----------------|-----------------|-----------------|----------------------------------------|---------------------|-----------------------------------|-------------------------------|---------|\n| | Barom. Attach. Therm. | Barom. Attach. Therm. | Fahrenheit. Self-registering. | Lowest. Highest. | 9 A.M. | 3 P.M. | NNE | Fine—cloudy—light wind. |\n| D 1 | 29.898 | 26.7 | 29.832 | 27.8 | 17 | 22.6 | 25.2 | 20.1 | 25.2 | 0.014 | NNE | Fine—cloudy—light wind. |\n| D 2 | 29.809 | 25.6 | 29.789 | 26.2 | 17 | 20.3 | 20.0 | 18.6 | 20.6 | E | Continued snow—light wind. |\n| D 3 | 29.820 | 24.5 | 29.843 | 24.8 | 21 | 22.3 | 21.8 | 17.7 | 25.6 | N | Light snow, with brisk wind. |\n| D 4 | 29.848 | 25.3 | 29.775 | 29.2 | 20 | 26.8 | 30.0 | 18.7 | 30.4 | NNE | Cloudy and hazy—light wind. |\n| D 5 | 29.735 | 25.8 | 29.666 | 28.2 | 18 | 22.3 | 24.5 | 18.7 | 24.5 | NNE | Snow—light wind. |\n| D 6 | 29.575 | 23.3 | 29.581 | 24.6 | 17 | 19.6 | 20.8 | 15.3 | 28.8 | N | Overcast and foggy—light wind. |\n| O 7 | 29.400 | 26.7 | 29.369 | 30.3 | 30 | 30.7 | 37.4 | 18.5 | 45.6 | SSE | Overcast—light rain. |\n| D 8 | 29.412 | 36.2 | 29.613 | 42.8 | 44 | 44.8 | 46.4 | 29.4 | 45.4 | SW | A.M. Lowering. P.M. Cloudless—light brisk wind. |\n| D 9 | 29.345 | 41.3 | 29.519 | 43.4 | 45 | 45.2 | 44.8 | 40.2 | 45.8 | SSW | High wind with rain, early A.M.—overcast—light rain. |\n| D 10 | 29.807 | 39.6 | 29.938 | 42.2 | 36 | 36.6 | 41.6 | 33.3 | 41.6 | W | A.M. Foggy. P.M. Fine and clear. |\n| D 11 | 30.173 | 38.7 | 30.175 | 42.0 | 36 | 36.7 | 43.2 | 31.2 | 43.2 | W | Lightly overcast. |\n| D 12 | 30.146 | 42.6 | 30.129 | 45.0 | 37 | 37.7 | 41.5 | 35.5 | 42.3 | S | Fine—light clouds and wind. |\n| D 13 | 30.170 | 40.4 | 30.178 | 42.5 | 34 | 34.7 | 40.2 | 32.5 | 40.2 | SSE | Fine—light wind and haze. |\n| O 14 | 30.100 | 38.5 | 30.095 | 39.3 | 32 | 32.3 | 36.5 | 30.2 | 36.5 | SW | Overcast—light fog. |\n| D 15 | 30.314 | 38.6 | 30.330 | 39.4 | 33 | 33.7 | 38.2 | 31.4 | 38.2 | NE | Overcast—light brisk wind. |\n| D 16 | 30.331 | 38.6 | 30.276 | 38.6 | 33 | 33.4 | 34.8 | 31.7 | 34.8 | N | Strong fog—light wind. |\n| D 17 | 29.983 | 36.3 | 29.829 | 36.8 | 30 | 30.3 | 33.5 | 29.3 | 35.5 | NW | Overcast—brisk wind. |\n| D 18 | 29.698 | 37.3 | 29.732 | 39.2 | 35 | 35.7 | 37.0 | 29.4 | 37.3 | NNE | A.M. Overcast. P.M. Fine—light wind. |\n| D 19 | 29.773 | 37.7 | 29.766 | 40.2 | 34 | 34.7 | 37.0 | 29.0 | 37.7 | W | Fine—lightly cloudy. |\n| D 20 | 29.537 | 35.8 | 29.510 | 39.2 | 29 | 30.3 | 38.0 | 26.3 | 38.0 | WSW | Fine—lightly hazy. |\n| O 21 | 29.620 | 37.3 | 29.475 | 41.5 | 35 | 37.0 | 41.0 | 28.4 | 41.0 | SW | Cloudy—light wind. Rain P.M. |\n| D 22 | 29.698 | 37.1 | 29.723 | 39.8 | 31 | 34.6 | 39.5 | 30.0 | 47.7 | 0.342 | WSW | Lightly cloudy. Rain P.M. |\n| D 23 | 29.682 | 42.4 | 29.785 | 45.2 | 48 | 48.3 | 50.5 | 33.7 | 50.5 | 0.075 | WSW | Rain with light brisk wind. |\n| D 24 | 29.970 | 46.9 | 30.062 | 51.5 | 49 | 49.8 | 55.4 | 46.7 | 55.5 | W | Overcast. |\n| D 25 | 30.195 | 50.3 | 30.192 | 53.0 | 49 | 49.4 | 54.2 | 47.0 | 54.8 | SW | Fine and cloudless. |\n| D 26 | 30.076 | 53.3 | 30.068 | 55.5 | 50 | 50.7 | 53.0 | 47.7 | 54.3 | 0.086 | SSW | Light clouds and wind—rain at night. |\n| D 27 | 30.068 | 53.7 | 30.071 | 56.8 | 51 | 51.6 | 55.8 | 48.4 | 56.3 | 0.028 | W | Fine—hazy. |\n| O 28 | 30.070 | 52.7 | 30.139 | 55.8 | 48 | 48.7 | 54.6 | 45.8 | 55.3 | WSW | Fine—lightly overcast. |\n\n**Monthly Mean of the Barometer, corrected for Capillarity and reduced to 32° Fahr.**\n\n\\[ \\text{Mean} = 29.877 \\]\n\\[ \\text{Mean} = 37.6 \\]\n\\[ \\text{Mean} = 29.884 \\]\n\\[ \\text{Mean} = 40.0 \\]\n\\[ \\text{Mean} = 34.2 \\]\n\\[ \\text{Mean} = 35.7 \\]\n\\[ \\text{Mean} = 39.2 \\]\n\\[ \\text{Mean} = 30.9 \\]\n\\[ \\text{Sum} = 40.5 \\]\n\\[ \\text{Sum} = 1.006 \\]\n\n\\[ \\{ 9 \\text{ A.M.} \\quad 3 \\text{ P.M.} \\} \\]\n\\[ \\{ 29.866 \\quad 29.867 \\} \\]\n\n---\n\n### OBSERVANDA.\n\nHeight of the Cistern of the Barometer above a Fixed Mark on Waterloo Bridge.......................... = 83 feet 2½ in.\n\n.........................................................above the mean level of the Sea (presumed about) ............... = 95 feet.\n\nThe External Thermometer is 2 feet higher than the Barometer Cistern.\n\nHeight of the Receiver of the Rain Gauge above the Court of Somerset House.......................... = 79 feet 0 in.\n\nThe hours of observation are of Mean Time, the day beginning at Midnight.\n\nThe Thermometers are graduated by Fahrenheit's Scale.\n\nThe Barometer is divided into inches and decimals.\n## METEOROLOGICAL JOURNAL FOR MARCH, 1830.\n\n| 1830. March | 9 o'clock, A.M. | 3 o'clock, P.M. | Dew Point at 9 A.M. in degrees of Fahr. | External Thermometer | Rain, in inches. Read off at 9 A.M. | Direction of the Wind at 9 A.M. | Remarks |\n|-------------|-----------------|-----------------|----------------------------------------|---------------------|-----------------------------------|-------------------------------|---------|\n| | Barom. Attach. Therm. | Barom. Attach. Therm. | Fahrenheit | Self-registering. | Lowest. Highest. | | |\n| 1 | 30.347 | 49.8 | 30.360 | 53.5 | 47 | 48.3 | 51.4 | 46.3 | 51.4 | W | Fine—hazy. |\n| 2 | 30.430 | 52.3 | 30.421 | 54.4 | 49 | 49.8 | 51.5 | 47.3 | 51.7 | SSW | Lightly cloudy. |\n| 3 | 30.423 | 51.6 | 30.383 | 54.5 | 45 | 48.7 | 52.2 | 46.3 | 52.4 | S | Overcast. |\n| 4 | 30.328 | 46.7 | 30.032 | 49.0 | 34 | 39.4 | 43.0 | 34.7 | 43.3 | E | Clear and cloudless—brisk wind. |\n| 5 | 29.981 | 45.8 | 29.954 | 49.5 | 36 | 40.3 | 48.6 | 34.4 | 48.6 | ENE | Fine and clear—light wind. |\n| 6 | 30.030 | 46.3 | 29.987 | 50.0 | 38 | 42.4 | 49.5 | 37.7 | 50.3 | NE | A.M. Light fog. P.M. Fine and clear. |\n| 7 | 30.005 | 43.2 | 30.005 | 46.3 | 36 | 36.7 | 42.8 | 32.7 | 42.8 | NNE | A.M. Light fog. P.M. Clear and cloudless—light wind. |\n| 8 | 30.038 | 42.6 | 29.971 | 46.4 | 36 | 36.3 | 46.4 | 34.6 | 46.4 | E | A.M. Overcast. P.M. Fine and clear. |\n| 9 | 29.675 | 45.3 | 29.562 | 46.6 | 41 | 43.7 | 46.8 | 35.7 | 46.8 | SE | Overcast—light continued rain. |\n| 10 | 29.643 | 46.9 | 29.674 | 50.4 | 46 | 46.3 | 50.2 | 42.8 | 50.6 | 0.081 | A.M. Rain. P.M. Fine. |\n| 11 | 29.667 | 49.7 | 29.809 | 53.4 | 49 | 51.1 | 56.8 | 45.3 | 57.3 | 0.039 | Light clouds and wind. |\n| 12 | 30.116 | 52.3 | 30.014 | 51.2 | 47 | 50.2 | 54.8 | 44.2 | 55.3 | WSW | Fine—lightly cloudy. |\n| 13 | 30.209 | 50.3 | 30.303 | 53.5 | 34 | 44.7 | 51.6 | 40.2 | 51.7 | W | Fine—light clouds. |\n| 14 | 30.167 | 48.7 | 29.983 | 53.5 | 39 | 44.3 | 50.7 | 37.6 | 51.3 | SW | Fine—lightly cloudy. |\n| 15 | 29.472 | 48.6 | 29.390 | 50.4 | 47 | 47.6 | 48.5 | 40.8 | 48.7 | SSW | A.M. Fine—broken clouds. P.M. Rain. Evening clear. |\n| 16 | 29.634 | 46.7 | 29.716 | 49.5 | 36 | 43.3 | 45.8 | 35.8 | 49.8 | 0.019 | Fine and cloudless—light wind. |\n| 17 | 29.792 | 47.8 | 29.930 | 51.6 | 48 | 49.7 | 54.5 | 40.7 | 55.8 | 0.022 | Overcast—light wind. |\n| 18 | 30.152 | 50.7 | 30.209 | 53.9 | 45 | 52.3 | 54.6 | 45.6 | 55.7 | WNW | Light clouds and wind. |\n| 19 | 30.256 | 53.3 | 30.195 | 55.8 | 47 | 50.5 | 54.6 | 48.3 | 54.9 | SSW | Overcast. |\n| 20 | 30.134 | 52.6 | 30.174 | 54.8 | 37 | 46.6 | 52.6 | 44.4 | 53.3 | 0.033 | Fine and cloudless—light wind. |\n| 21 | 30.373 | 51.6 | 30.351 | 55.4 | 44 | 45.5 | 54.7 | 41.7 | 56.3 | W | Fine and clear—light clouds. |\n| 22 | 30.179 | 51.3 | 30.021 | 53.2 | 43 | 48.3 | 49.4 | 43.6 | 50.5 | SSW | Lowering—rain with light wind. |\n| 23 | 30.064 | 50.8 | 30.040 | 53.3 | 36 | 45.7 | 51.2 | 39.4 | 51.7 | WSW | A.M. Overcast. P.M. Fine. |\n| 24 | 30.125 | 52.8 | 30.166 | 54.9 | 49 | 52.2 | 55.8 | 45.4 | 56.4 | W | A.M. Light fog. P.M. Fine. |\n| 25 | 30.377 | 51.5 | 30.366 | 56.5 | 45 | 48.3 | 60.8 | 41.3 | 61.6 | W | Fine—light clouds and wind. |\n| 26 | 30.561 | 54.7 | 30.566 | 59.6 | 45 | 50.7 | 65.0 | 43.5 | 65.7 | WSW | Fine and cloudless—faint haze. |\n| 27 | 30.600 | 55.7 | 30.547 | 60.1 | 45 | 51.3 | 64.8 | 45.7 | 63.3 | W | Fine and cloudless—light haze. |\n| 28 | 30.458 | 53.4 | 30.385 | 59.3 | 42 | 51.3 | 62.5 | 45.4 | 63.3 | N | Clear and cloudless. |\n| 29 | 30.209 | 50.2 | 30.120 | 57.5 | 42 | 43.7 | 61.8 | 40.3 | 63.3 | E | Fine and clear—light wind. |\n| 30 | 30.032 | 53.7 | 30.002 | 58.8 | 43 | 51.4 | 58.3 | 43.3 | 61.5 | N | Clear and cloudless. |\n| 31 | 29.792 | 49.6 | 29.704 | 54.0 | 41 | 44.6 | 53.8 | 40.8 | 56.1 | E | Strong fog—Rain, with brisk wind, at night. |\n\n**Mean**\n\n| Mean | Mean | Mean | Mean | Mean | Mean | Mean | Mean | Sum |\n|------|------|------|------|------|------|------|------|-----|\n| 30.102 | 49.9 | 30.075 | 53.3 | 42.3 | 46.6 | 53.1 | 41.5 | 53.9 | 0.194 |\n\nMonthly Mean of the Barometer, corrected for Capillarity and reduced to 32° Fahr. ............... { 9 A.M. 3 P.M. }\n{ 30.060 30.025 }\n\n### OBSERVANDA.\n\nHeight of the Cistern of the Barometer above a Fixed Mark on Waterloo Bridge ......................... = 83 feet 2½ in.\n.............................................................. above the mean level of the Sea (presumed about) ................. = 95 feet.\nThe External Thermometer is 2 feet higher than the Barometer Cistern.\nHeight of the Receiver of the Rain Gauge above the Court of Somerset House ......................... = 79 feet 0 in.\nThe hours of observation are of Mean Time, the day beginning at Midnight.\nThe Thermometers are graduated by Fahrenheit’s Scale.\nThe Barometer is divided into inches and decimals.\n## METEOROLOGICAL JOURNAL FOR APRIL, 1830.\n\n| 1830, April | 9 o'clock, A.M. | 3 o'clock, P.M. | Dew Point at 9 A.M. in degrees of Fahr. | External Thermometer. | Rain, in inches. Read off at 9 A.M. | Direction of the Wind at 9 A.M. | Remarks |\n|-------------|-----------------|-----------------|----------------------------------------|----------------------|-------------------------------------|-------------------------------|---------|\n| | Barom. | Attach. Therm. | Barom. | Attach. Therm. | Fahrenheit. Self-registering. | Lowest. Highest. | |\n| 1 | 29.694 | 46.4 | 29.708 | 48.8 | 37 | 37.5 | 42.0 | 34.9 | 42.0 | 0.389 | N | Overcast—rain and snow with brisk wind A.M. |\n| 2 | 29.542 | 45.7 | 29.372 | 45.6 | 38 | 38.7 | 39.8 | 36.2 | 39.8 | 0.250 | E | Rain—brisk wind. |\n| 3 | 29.218 | 44.3 | 29.519 | 45.8 | 39 | 39.3 | 40.0 | 36.3 | 40.0 | 0.583 | N | A.M. Rain. P.M. Overcast—brisk wind. |\n| 4 | 30.112 | 42.3 | 30.152 | 45.7 | 29 | 35.3 | 41.8 | 30.7 | 42.3 | 0.014 | NNW | Fine—lightly cloudy. |\n| 5 | 30.188 | 40.7 | 30.085 | 45.0 | 29 | 34.6 | 46.2 | 29.7 | 46.2 | N | A.M. Overcast. P.M. Fine. |\n| 6 | 29.778 | 43.4 | 29.751 | 47.5 | 31 | 41.3 | 56.0 | 31.4 | 57.3 | W | Fine and cloudless—light haze. |\n| 7 | 29.878 | 48.3 | 29.828 | 51.8 | 42 | 48.4 | 54.2 | 40.3 | 54.7 | SSW | Overcast—light wind. |\n| 8 | 29.620 | 51.3 | 29.552 | 55.0 | 45 | 53.3 | 62.2 | 45.3 | 64.3 | ESE | Fine—light clouds. |\n| 9 | 29.433 | 57.2 | 29.428 | 60.6 | 50 | 57.4 | 62.3 | 48.4 | 62.7 | SSW | Fine and clear—light clouds and wind. |\n| 10 | 29.479 | 51.7 | 29.555 | 57.8 | 48 | 49.6 | 54.6 | 45.3 | 58.7 | W | A.M. Cloudy. P.M. Fine—showers. |\n| 11 | 29.619 | 55.9 | 29.613 | 58.3 | 44 | 52.7 | 56.6 | 45.6 | 56.6 | 0.008 | SSW | Fine and clear—cloudy—light showers. |\n| 12 | 29.451 | 54.7 | 29.492 | 57.2 | 52 | 53.8 | 54.8 | 46.8 | 57.4 | 0.167 | NNW | Cloudy—showers. |\n| 13 | 29.773 | 56.3 | 29.856 | 57.5 | 46 | 53.7 | 57.0 | 43.3 | 57.7 | W | Fine and clear—light brisk wind. |\n| 14 | 30.040 | 53.5 | 29.977 | 58.7 | 44 | 52.4 | 60.2 | 43.2 | 61.6 | W | Fine—lightly cloudy. |\n| 15 | 29.792 | 55.3 | 29.708 | 58.2 | 50 | 53.4 | 58.5 | 49.4 | 59.2 | S | Overcast. |\n| 16 | 29.674 | 58.4 | 29.698 | 61.0 | 56 | 58.5 | 61.4 | 51.3 | 63.8 | 0.042 | WSW | Lightly cloudy—light rain P.M. |\n| 17 | 29.686 | 59.2 | 29.653 | 61.2 | 52 | 56.6 | 58.6 | 52.3 | 61.6 | 0.008 | SSW | Lowering—light brisk wind. |\n| 18 | 29.860 | 60.3 | 29.837 | 60.6 | 45 | 54.0 | 60.4 | 44.6 | 61.6 | 0.075 | W | Fine and clear—light clouds. |\n| 19 | 29.635 | 53.7 | 29.637 | 59.3 | 43 | 52.9 | 55.6 | 47.3 | 59.7 | NNW | Overcast—brisk wind. |\n| 20 | 29.732 | 53.8 | 29.766 | 57.4 | 50 | 50.7 | 55.2 | 43.2 | 58.4 | 0.133 | W | Thunder and lightning with heavy rain and hail. |\n| 21 | 29.898 | 53.6 | 29.779 | 57.8 | 51 | 51.2 | 55.2 | 43.7 | 58.6 | 0.022 | WSW | Overcast—rain A.M. |\n| 22 | 29.567 | 55.7 | …… | …… | …… | …… | …… | …… | …… | WSW | Overcast. |\n| 23 | 29.305 | 58.5 | 29.257 | 60.5 | 55 | 55.7 | 55.5 | 52.3 | 57.3 | SSW | Light rain—strong high wind at night. |\n| 24 | 29.242 | 56.9 | 29.470 | 59.2 | 52 | 52.3 | 55.3 | 49.3 | 57.7 | WSW | A.M. Rain. P.M. Fine and clear. |\n| 25 | 30.017 | 55.3 | 30.098 | 59.3 | 40 | 51.7 | 58.7 | 40.8 | 62.5 | W | Brisk wind. |\n| 26 | 30.221 | 58.6 | 30.210 | 60.6 | 50 | 56.6 | 61.8 | 47.2 | 64.4 | SSW | Fine and clear—cloudy. |\n| 27 | 30.247 | 58.6 | 30.196 | 61.1 | 42 | 57.9 | 62.8 | 44.6 | 63.6 | SSE | Fine and clear—light clouds. |\n| 28 | 30.139 | 59.7 | 30.078 | 61.6 | 50 | 59.4 | 64.4 | 46.6 | 67.3 | ESE | Very clear and cloudless—brisk wind. |\n| 29 | 30.028 | 63.7 | 29.921 | 66.2 | 50 | 62.7 | 69.5 | 51.3 | 70.7 | ESE | Very clear and cloudless—light wind. |\n| 30 | 29.885 | 65.3 | 29.849 | 68.9 | 54 | 64.6 | 70.0 | 52.3 | 72.0 | E | Very clear and cloudless—light wind. |\n\nMean Mean Mean Mean Mean Mean Mean Mean Sum\n\n29.758 53.8 29.760 56.8 45.5 51.3 56.2 44.1 57.9 2,021\n\nMonthly Mean of the Barometer, corrected for Capillarity and reduced to 32° Fahr. ............... { 9 A.M. 3 P.M. } { 29.707 29.701 }\n\n### OBSERVANDA.\n\nHeight of the Cistern of the Barometer above a Fixed Mark on Waterloo Bridge ...................... = 83 feet 2½ in.\n\n.................................................. above the mean level of the Sea (presumed about) .......... = 95 feet.\n\nThe External Thermometer is 2 feet higher than the Barometer Cistern.\n\nHeight of the Receiver of the Rain Gauge above the Court of Somerset House ..................... = 79 feet 0 in.\n\nThe hours of observation are of Mean Time, the day beginning at Midnight.\n\nThe Thermometers are graduated by Fahrenheit's Scale.\n\nThe Barometer is divided into inches and decimals.\n## METEOROLOGICAL JOURNAL FOR MAY, 1830.\n\n| 1830. May | 9 o'clock, A.M. | 3 o'clock, P.M. | Dew Point at 9 A.M. in degrees of Fahr. | External Thermometer. | Rain, in inches, Read off at 9 A.M. | Direction of the Wind at 9 A.M. | Remarks |\n|-----------|----------------|----------------|----------------------------------------|----------------------|----------------------------------|-------------------------------|---------|\n| | Barom. | Attach. Therm. | Barom. | Attach. Therm. | Fahrenheit. | Self-registering. | Lowest. | Highest. | SW | Fine and clear—light clouds and brisk wind. |\n| 1 | 30.002 | 67.3 | 30.005 | 66.3 | 48 | 59.6 | 62.6 | 52.4 | 66.7 | SW | Fine and clear—light clouds and brisk wind. |\n| 2 | 30.152 | 65.7 | 30.128 | 64.5 | 46 | 59.0 | 64.5 | 46.7 | 66.4 | W | Fine and clear—light clouds. |\n| 3 | 30.217 | 58.8 | 30.180 | 61.7 | 40 | 55.3 | 60.4 | 45.7 | 61.7 | N | Fine—cloudy. |\n| 4 | 30.171 | 60.3 | 30.125 | 62.2 | 47 | 57.6 | 62.8 | 43.7 | 63.7 | E | Very clear and cloudless—light brisk wind. |\n| 5 | 30.087 | 60.7 | 30.107 | 63.6 | 49 | 60.4 | 68.8 | 46.4 | 71.6 | E | Fine and clear—light brisk wind. |\n| 6 | 29.933 | 65.5 | 29.824 | 68.2 | 58 | 66.5 | 73.4 | 55.7 | 77.3 | NNE | Fine—cloudy. |\n| 7 | 29.631 | 69.6 | 29.565 | 71.6 | 67 | 69.3 | 72.0 | 58.3 | 75.7 | ESE | Fine and clear—cloudy. |\n| 8 | 29.597 | 68.3 | 29.504 | 66.3 | 55 | 65.3 | 60.2 | 54.7 | 67.3 | ESE | A.M. Fine. P.M. Heavy showers. |\n| 9 | 29.332 | 63.1 | 29.312 | 62.3 | 51 | 54.7 | 53.6 | 52.7 | 53.8 | SSW | Lowering—light rain. |\n| 10 | 29.411 | 58.7 | 29.511 | 60.4 | 47 | 51.7 | 51.8 | 47.8 | 55.7 | WSW | Overcast—light rain. |\n| 11 | 29.699 | 53.7 | 29.732 | 56.3 | 42 | 47.6 | 50.8 | 42.6 | 51.6 | N | Overcast. |\n| 12 | 29.781 | 52.8 | 29.805 | 57.4 | 44 | 48.4 | 53.5 | 43.3 | 56.4 | NNE | Overcast—showery. |\n| 13 | 29.953 | 53.7 | 30.023 | 55.2 | 45 | 48.6 | 53.0 | 45.5 | 53.7 | N | Overcast—light wind. |\n| 14 | 30.181 | 53.8 | 30.142 | 56.8 | 44 | 48.8 | 54.5 | 42.7 | 55.7 | N | Fine—light clouds. |\n| 15 | 30.219 | 56.7 | 30.224 | 61.5 | 46 | 55.7 | 63.0 | 46.3 | 64.7 | SSW | Fine—lightly cloudy. |\n| 16 | 30.329 | 63.7 | 30.292 | 64.2 | 45 | 60.0 | 68.3 | 45.7 | 69.2 | SW | Fine and clear—light clouds. |\n| 17 | 30.240 | 64.2 | 30.175 | 66.2 | 53 | 64.6 | 73.0 | 52.6 | 75.0 | WSW | Fine and clear. |\n| 18 | 30.058 | 67.3 | 29.969 | 68.8 | 48 | 67.3 | 73.4 | 56.3 | 74.7 | SSW | Fine and clear—light clouds. |\n| 19 | 29.931 | 71.3 | 29.920 | 68.8 | 48 | 63.6 | 65.6 | 51.3 | 69.3 | WNW | Fine and clear—light clouds. |\n| 20 | 29.977 | 70.7 | 29.940 | 70.8 | 52 | 68.6 | 64.6 | 55.7 | 69.5 | ESE | Fine and clear—thunder and lightning at night. |\n| 21 | 29.834 | 65.7 | 29.821 | 67.0 | 50 | 62.0 | 62.8 | 51.7 | 65.4 | E | Fine and clear—thunder and lightning at night. |\n| 22 | 29.810 | 61.5 | 29.914 | 66.8 | 51 | 57.8 | 64.3 | 50.2 | 65.2 | SSW | A.M. Overcast. P.M. Fine and clear. |\n| 23 | 29.906 | 65.8 | 29.834 | 67.7 | 54 | 63.0 | 63.8 | 51.6 | 68.5 | E | Clear—cloudy. At 4 P.M. violent storm during 40 minutes. |\n| 24 | 29.680 | 64.7 | 29.740 | 68.4 | 60 | 64.0 | 66.8 | 55.7 | 68.3 | ESE | Fine—cloudy—heavy rain at 6 A.M. |\n| 25 | 29.660 | 72.3 | 29.581 | 69.6 | 53 | 66.4 | 65.2 | 52.4 | 69.5 | S | Overcast—light clouds. |\n| 26 | 29.445 | 64.8 | 29.449 | 66.2 | 51 | 59.7 | 59.8 | 53.3 | 63.9 | W | A.M. Fine. P.M. Rain. |\n| 27 | 29.525 | 62.3 | 29.554 | 65.8 | 46 | 56.6 | 60.5 | 49.7 | 61.7 | W var. | Fine—cloudy. |\n| 28 | 29.841 | 59.7 | 29.941 | 62.2 | 47 | 52.9 | 53.5 | 50.3 | 58.3 | NNW | Cloudy and showery. |\n| 29 | 30.104 | 66.3 | 30.048 | 64.6 | 41 | 58.4 | 63.5 | 47.8 | 66.0 | NW | Fine—lightly overcast. |\n| 30 | 29.803 | 60.6 | 29.769 | 63.6 | 52 | 56.0 | 59.7 | 52.3 | 60.3 | SW | Broken clouds. Rain A.M. |\n| 31 | 29.901 | 66.0 | 29.978 | 64.2 | 49 | 59.4 | 61.8 | 48.6 | 63.3 | WSW | Fine—cloudy. |\n\n### Monthly Mean of the Barometer, corrected for Capillarity and reduced to 32° Fahr.\n\n- **9 A.M.:** 29.808\n- **3 P.M.:** 29.796\n\n### OBSERVANDA.\n\nHeight of the Cistern of the Barometer above a Fixed Mark on Waterloo Bridge = 83 feet 2½ in.\n\nAbove the mean level of the Sea (presumed about) = 95 feet.\n\nThe External Thermometer is 2 feet higher than the Barometer Cistern.\n\nHeight of the Receiver of the Rain Gauge above the Court of Somerset House = 79 feet 0 in.\n\nThe hours of observation are of Mean Time, the day beginning at Midnight.\n\nThe Thermometers are graduated by Fahrenheit's Scale.\n\nThe Barometer is divided into inches and decimals.\n## METEOROLOGICAL JOURNAL FOR JUNE, 1830.\n\n| 1830. June | 9 o'clock, A.M. | 3 o'clock, P.M. | Dew Point at 9 A.M., in degrees of Fahr. | External Thermometer. | Rain, in inches, Read off at 9 A.M. | Direction of the Wind at 9 A.M. | Remarks. |\n|------------|----------------|----------------|----------------------------------------|----------------------|----------------------------------|-------------------------------|----------|\n| | Barom. Attach. Therm. | Barom. Attach. Therm. | Fahrenheit. | Self-registering. Lowest. Highest. | 9 A.M. | 3 P.M. | |\n| 1 | 30.054 61.8 | 30.071 64.3 | 48 60.0 61.8 54.2 65.3 | WSW | Fine—lightly cloudy. |\n| 2 | 30.161 63.7 | 30.113 65.8 | 49 59.7 67.2 49.3 69.3 | SSW | Fine—light clouds. |\n| 3 | 29.807 64.6 | 29.612 62.8 | 53 61.6 60.5 53.5 62.3 | SSE | Cloudy. Light rain with unsteady wind. |\n| 4 | 29.620 59.6 | 29.789 62.8 | 51 54.3 58.5 51.7 60.4 | SW | Lowering—light brisk wind. |\n| 5 | 30.036 65.4 | 30.002 65.0 | 53 58.5 66.5 48.6 68.3 | W | Lightly overcast. |\n| 6 | 30.036 70.7 | 29.963 68.0 | 50 65.3 66.5 52.8 69.6 | SW | Clear—cloudy. |\n| 7 | 29.908 63.7 | 29.900 67.2 | 55 59.5 60.5 54.5 64.2 | SSW | Overcast—light rain. |\n| 8 | 30.045 62.5 | 30.065 64.3 | 50 55.7 58.9 52.3 59.7 | N | Lightly overcast. |\n| 9 | 30.070 59.4 | 30.024 60.8 | 51 53.7 56.5 51.3 57.5 | N | Overcast—Rain P.M. |\n| 10 | 30.006 57.7 | 29.986 60.2 | 52 52.6 56.8 49.7 59.8 | NNW | Overcast—Light rain P.M. |\n| 11 | 30.002 66.7 | 29.977 65.8 | 53 59.8 63.4 49.8 65.7 | W | Lightly overcast. |\n| 12 | 29.751 62.0 | 29.735 64.8 | 58 58.3 64.2 55.3 65.3 | SSW | A.M. Light rain. P.M. Fine—light clouds. |\n| 13 | 29.784 61.7 | 29.739 64.2 | 46 58.4 58.8 47.7 64.3 | W | Fine—showery. Thunder at noon. |\n| 14 | 29.688 59.3 | 29.637 63.2 | 46 56.3 58.0 51.6 62.7 | NNW | Overcast—Light rain P.M. |\n| 15 | 29.688 63.7 | 29.708 61.0 | 46 55.0 56.5 48.3 59.7 | N | Fine—light clouds and wind. |\n| 16 | 29.671 58.3 | 29.783 61.8 | 50 53.7 59.6 49.2 61.3 | NE | A.M. Overcast. P.M. Fine. |\n| 17 | 29.921 55.8 | 29.930 59.2 | 42 51.2 54.5 47.3 57.6 | N | Overcast—light brisk wind—Rain P.M. |\n| 18 | 29.838 59.4 | 29.756 63.0 | 52 57.7 60.4 46.7 63.6 | WSW | A.M. Fine. P.M. Overcast—light rain. |\n| 19 | 29.658 64.6 | 29.693 64.5 | 40 57.3 62.8 49.7 64.7 | NNW | Fine and clear—light clouds. |\n| 20 | 29.652 71.2 | 29.655 66.4 | 44 59.5 66.6 50.3 67.4 | W | Fine and clear—lightly cloudy. |\n| 21 | 29.549 70.3 | 29.479 66.8 | 54 60.4 62.6 52.7 65.7 | NE | A.M. Fine. P.M. Overcast. |\n| 22 | 29.407 58.7 | 29.523 60.5 | 51 51.3 56.4 48.7 59.3 | N | Overcast—light rain A.M. |\n| 23 | 29.884 66.4 | 29.879 62.5 | 42 58.3 61.6 46.6 64.3 | NNW | Fine—lightly overcast. |\n| 24 | 29.914 68.7 | 29.898 66.2 | 52 62.7 63.8 52.3 67.5 | ESE | A.M. Fine. P.M. Lightly overcast. |\n| 25 | 29.773 62.3 | 29.727 66.3 | 60 60.5 65.8 56.6 67.4 | E | Overcast. |\n| 26 | 29.691 66.7 | 29.760 70.5 | 60 66.4 72.4 60.8 73.8 | SSW | Fine—cloudy. |\n| 27 | 29.849 69.8 | 29.846 71.7 | 57 67.8 73.8 58.3 76.7 | SE | Fine and very clear—light clouds. |\n| 28 | 29.888 70.3 | 29.842 71.2 | 60 66.7 69.4 60.3 72.6 | SSW | Clear—cloudy—brisk wind. |\n| 29 | 29.898 72.6 | 29.939 72.5 | 57 68.6 71.4 58.8 73.2 | W | Fine and clear—light clouds. |\n| 30 | 30.060 73.7 | 30.045 70.6 | 57 65.5 69.0 53.4 69.7 | NNW | Fine and clear—cloudy. |\n\n### Monthly Mean of the Barometer, corrected for Capillarity and reduced to 32° Fahr.\n\n- **9 A.M.:** 29.765\n- **3 P.M.:** 29.756\n\n### OBSERVANDA.\n\nHeight of the Cistern of the Barometer above a Fixed Mark on Waterloo Bridge .................. = 83 feet 2½ in.\n\n................................. above the mean level of the Sea (presumed about) = 95 feet.\n\nThe external Thermometer is 2 feet higher than the Barometer Cistern.\n\nHeight of the Receiver of the Rain Gauge above the Court of Somerset House .................. = 79 feet 0 in.\n\nThe hours of observation are of Mean Time, the day beginning at Midnight.\n\nThe Thermometers are graduated by Fahrenheit's Scale.\n\nThe Barometer is divided into inches and decimals.", "source": "olmocr", "added": "2026-01-12", "created": "2026-01-12", "metadata": { "Source-File": "/home/jic823/projects/def-jic823/royalsociety/pdfs/107916.pdf", "olmocr-version": "0.3.4", "pdf-total-pages": 8, "total-input-tokens": 13694, "total-output-tokens": 17451, "total-fallback-pages": 0 }, "attributes": { "pdf_page_numbers": [ [ 0, 0, 1 ], [ 0, 151, 2 ], [ 151, 9702, 3 ], [ 9702, 16762, 4 ], [ 16762, 23840, 5 ], [ 23840, 33302, 6 ], [ 33302, 39425, 7 ], [ 39425, 43731, 8 ] ], "primary_language": [ "en", "en", "en", "en", "en", "en", "en", "en" ], "is_rotation_valid": [ true, true, true, true, true, true, true, true ], "rotation_correction": [ 0, 0, 0, 0, 0, 0, 0, 0 ], "is_table": [ false, false, true, true, true, true, true, true ], "is_diagram": [ false, false, false, false, false, false, false, false ] }, "jstor_metadata": { "identifier": "jstor-107916", "title": "Meteorological Journal, Kept by the Assistant Secretary at the Apartments of the Royal Society, by Order of the President and Council", "authors": null, "year": 1830, "volume": "120", "journal": "Philosophical Transactions of the Royal Society of London", "page_count": 8, "jstor_url": "https://www.jstor.org/stable/107916" } }