238 Meteorological Observations for January 1830. 



MKTEOUOLOGICAL OBSERVATIONS FOR JANUARY 1830. 



Gosport. — Numerical Results Jbr the Month. 



Barom. Max. 30-59. Jan. 1. WindN.E.—Min. 28-60 Jan. 20. WindE. 

 Range of the mercury 1-99. 



Mean barometrical pressure for the month 29-969 



Spaces described by the rising and falling of the mercury 7*060 



Greatest variation in 24 hours 1-050. — Number of changes 22. 

 Therm. Max. 44° Jan. 7- Wind N.W.— Min. 17° Jan. 31. Wind N.E. 

 Range 27°.— Mean temp.of exter. air 32°-98. For 30 days with in VJ 30-30 

 Max. var. in 24 hours 21°. — Mean temp, of spring-water at 8 A.M. 48-15 



De Luc's Whalebone Hygrometer, 



Greatest humidity of the atmosphere in the evening of the 24th ... 96° 

 Greatest dryness of the atmosphere in the afternoon of the 10th... 56 



Range of the index 40 



Mean at 2 P.M. 79°-5.— Mean at 8 A.M. 82°-8.— Mean at 8 P.M. 82-3 



of three observations each day at 8, 2, and 8 o'clock 81*5 



Evaporation for the month 0-78 inch. 



Rain in the pluviameter near the ground 2-81 inches. 



Prevailing wind, N.E. 



Summary of the Weather. 



A clear sky, 3 ; fine, with various modifications of clouds, 6 ; an over- 

 cast sky without rain, 14 j foggy, l\; rain and snow, 6j. — Total 31 days. 



Clouds. 



Cirrus. Cirrocumulus. Cirrostratus. Stratus. Cumulus. Cumulostr. Nimbus. 



4 2 30 1 9 19 



Scale of the prevailing Winds. 



N. N.E. E. S.E. S. S.W. W^ N.W. Days. 

 7 12| 2 3 J 2 4 31 



General Observatio?is.— The weather this month has been very cold, ge- 

 nerally cloudy and humid, with frequent heavy falls of snow, which be- 

 tween the 11th and 20th appear to have been unprecedented. Here 

 the moats and marshes were ice-bound till the 23rd, and the houses 

 and ground most of the time covered with snow; but the ice was rugged, 

 from the snow-water having frozen upon it. It snowed more or less on 

 fifteen days, and the whole depth upon a plane surface was sixteen inches ; 

 but forty or fifty miles inland the depth exceeded four feet, and in several 

 dales in Gloucestersliire and Somerpetshire it was found the square of that 

 number in depth, in consequence of the great drifts from off the hills, which 

 rendered the roads impassable for nearly two days, till passages for the 

 coaches, &c. were cut through it. In the night of the 18th snow fell here 

 seven inciies in depth; but assuming its specific gravityat one-tenth the weight 

 of water, the quantity received in the rain-gauge on being dissolved, gave 

 eight inches in depth ; the snow, however, was very moist and adhesive, 

 and weighed down the branches of short trees and shrubs to the ground. 

 A remarkable circumstance accompanied this heavy fall of snow, namely, a 

 depression of TOo inch of mercury in the barometer in twenty-four hours, 

 notwithstanding the wind blew very strong from the N.E. most of the time. 



The 



