RESULTS OF METEOROLOGICAL OBSERVATIONS. 223 



in direction from the cloud winds occurred only 32 times, while the surface 

 and cloud winds were 55 times from the same point. 



In the following August, of the 93 observations by the clouds, 83 were 

 between northwest and southwest, and only 10 from different directions ; 

 and the surface winds from a different point than that of the clouds were 

 26. 



January was colder than usual in England, France, &c. At Suez, Kgypt, 

 in latitude near 30"^, a notice, dated January 26, 1864, states that ice was 

 formed a few days before; a phenomenon previously unknown there. 



February 17. Another cold period and storm from the west, and, like the 

 preceding, colder at the west : Begun at Chicago on the 16th, snowstorm, 

 8° below zero; Muscatine, 7° below; Milwaukee, 10° below; Desnioines, 

 7° below; Springfield (Illinois), 2° below; at Rochester, on the 17th, 1° 

 below, and 2° below on the 18th ; on the 18th, reached Belfast, Maine, and 

 the cold there was 15° below zero. The more severe weather in the valley 

 of the Mississippi, beginning with the frost of August 1863, has continued 

 in cold periods through 1864. 



June 6. Snowstorm on Mount Washington, New-Hampshire ; the snow 

 6 inches. June 11 & 12, some frost, slight. 



The Hot Period, from June 16 to 26, was peculiar ; not that the heat was 

 so great in midday as often occurs in summer, but was great through the 

 night as well as the day, so that this period was more like the hot weather 

 of Virginia or Georgia. This hot period extended widely over the country, 

 and was remarked at the south and west. At this city the heat at 2 p.m. 

 ranged from 80° to 93°, the daily means varied from 71°. 3 to 83°. 7, and 

 the average of the means was 78°. 3. If the average exceeds 70°, the day is 

 warm ; if it exceeds 80°, hot or very hut, as the excess may be. 



The hottest weather is commonly in the last half of June, in the month 

 of July, or in the first half of August. For comparison, I give the following 

 abstract (Table vii) for these three periods, of the highest mean, and the 

 highest temperature at 2 p.m. (See next page). 



In this Table, the variety and the uniformity of the hottest part of the 

 summer are distinctly shown. 



In the 28 years, the higheft daily mean, or hotteft day, was 85°./, July 17, 1856; 

 at 2 p.m., the mercury fhowed 102°, July 16, 1845; and 

 for very hot days, the range below this varies from 99 to 90°. 

 In the 28 years, the hotteft day in June, 85°.o, was the 30th in 1855 ; 



" " )uly, 85.7, " 17th in 1856; 



" " Auguft, 84.3, " 12th in 1853. 



In June 1864, the hotteft day, 83°. 7, was the 25th ; 

 July " " " 81.3, " 31ft; 



Auguft" " " 83.3, " ift. 



The hottest day in 85 years at Yale College in New-Haven, Connecticut, 

 was June 26, 1864, being 102° at 2 p.m. It would probably have been the 

 hottest day at Rochester, had not a thunder-shower at 8 p.m. with its wind 

 and rain and hail, cooled the air several degrees. Hot indeed was this sab- 

 bath, the 26th ; and had the temperature kept up in the evening only to 

 that of the night before, it would have given the highest mean or hottest 

 day in the 28 years; for it would have been 87°, while that of July 1856 

 was only 85°. 7. 



The hottest day at Amherst College in 28 years was August 1, 1864. 



