Years. TABLE XVII. Comparative view of the Annual Temperature, &c.* 1795 50.00 96 -10 106 1796 48.00 94 -20 114 44.85 51.83 48.39 48.35 87 2 22 44 89 195.5 169.5) 57 25 16.52 43 120 3 84 71.5 1814 45.92 53.85 49.77 49.84 86 53 92187 178 74 28.5 9 2 42 124.5 5 55 99 1820 43.24 56.31 47.40 48.98 100 64 105 154.5 211.5 85 28 44 1821 42.62 54.53 47.11 48.09 93-14 62 107 180.5 184.5 83 10 7.5 63.5 89 12 33.5 8.56.5 58.5 82.5 21 1822 43.85 56.00 47.69 49.18 90 -14 52 104 189 176 91 38 15.55 63 107 9.5 78 49 S. 1823 42.04 53.46 46.43 47.31 941 55 100 198.5 166.5 64 32 42 13 3 83 64.5 13 82 64.5 SE. 1824 42.71 54.26 46.69 47.88 89 3 30 60 92 187.5 178.5 82 19 1 31 17 3 100.5 48.5 39 51.5 75.5 SE. 6 30 12 36 54 104 209 156 56 13 59 19 3 48 83.5 40 48 64.5 65 104 209.5 155.5 77 21 333.12 46.5 13 2 60.5 84.5 34 70.5 54 108 215.5 149.5 79 22 97 13 649.80 64.5 10 2.5 23 114 31 66 54 S. 22.5 140 29.5 66 59.5 S. 11.53 35 106 26 80 74.5 S. 67 109 225.5 139.5 93 25 841.85 30 12 2 36.5 102.5 28 50 104 NW. 1831 49.15 94-10 65 1832 48.10] 911 111 61 104 206.5 158.5 89 25 439.52 21.5 9 102200.5 165. 22 944.45||32 17 1 29.5 117 31.5 70.5 85 S. .5 34 126 17.5 52.5 86.5s. * It will be well again to mention that Dr. Eights' mid-day observations were at 3 P. M. and mine at 2 P. M. Humboldt, in his interesting and most valuable memoir on “ Isothermal Lines* and the Distribution of Heat over the Globe,"† when remarking on the number of daily observations best calculated to ascertain the mean temperature, says, "Experience proves that the mean temperatures of the year, obtained by two or three observations, do not differ sensibly, if the intermediate observation is sufficiently distant (four or five hours) from the observation of maximum and minimum." I was desirous of verifying the correctness of this remark by the preceding table, and have been gratified with the result, which is as follows. The results deduceable from table XVII. may here be given. Highest point of the thermometer, do. 100° (in 1820.) Lowest do Greatest range, do do -20° (in 1796.) 120° Isothermal. Lines of equal hoat in various parts of the globe. +Edinburgh Philosophical Journal, vols. 3 and 4. He recommends (vol. 3, p. 18,) that in taking means in order to find the quantity of heat divided between the day and the night, we must couple the maximum of one day with the minimum of the day following. The directions of the Regents of the University would seem to be in comformity to this advice. WEATHER, as observed for 15 years, Fair days, 2997). Cloudy days, 2481; being an annual average of nearly 200 fair days. Rain. No. of days on which it fell, 1194. Annual av. 79 days. The following may be added as illustrative of the variety of the seasons. * On the 21st of February, 1822, there was a thunder storm in the evening. + October 25, 1823, a fall of rain commenced early in the morning, which at 11 A. M. changed to heavy snow, and this continued until 4 P. M. There were seve ral flashes of lightning, with severe thunder, during the snow storm. I add to these, as an important and necessary supplement, the periods of the opening and closing of the river in each year, so far at least as I have been enabled to obtain them. I copy them principally from an article which appeared some time since in the "New-York Daily Advertiser." Those marked * are derived from authentic records, or my own observations; (some of the last years are confirmed by extracts from the diary of my friend, Jas. Stevenson, Esq.) * All these were of course noticed at the morning's observations, while those of the heat at the mid-day one. A shower followed a short time after 2, and at its conclusion the thermometer was at 80, with a west wind. The 22d of June in this year (1820) appears to have been very generally warm. It was 94 at Albany; at Hudson, (N. Y.) 100; at Hartford (Conn.) 988; at Portland 94°; at Newburyport 1019, and at Quebec 98. |