ALLISON ON METEOROLOGY. 45 



the pressure decreased, coming down now to a mean of 29.658. 

 The mean amount of cloud was 5.35. N. W. winds still prevail- 

 ing, but very moderate, only averaging 5.99 miles. We had rather 

 more rain than the normal fall — 3.63 inches; but the very slight 

 depth of 3.7 inches of snow. (17.3 is the March average and in 

 March, 1875, we had 14 inches.) There was but one gale, and 

 that not strong ; and sleighing on the first three days only. 



April made small progress towards spring. Its mean tempera- 

 ture was 33°39 — only surpassing that of March by 2°61, and 

 falling short of its 12 years normal by 4°34. On the 1st the 

 thermometer was down to 7°2. The mean barometer rose to 

 29.792. Mean amount of cloud was 6.08. The prevailing wind 

 fell back to S. W., with a mean velocity still light — 6.37 miles per 

 hour. Only 1.90 inches of rain fell, or about 66 percent, of the 

 normal ; but the extraordinary quantity of 26.5 inches of snow was 

 measured, being 17.3 inches above the fall we expect in April. 

 There were 4 gales, and 10 days sleighing, the latest on the 14th 

 of the month. 



May, with a mean temperature of 49° 19, (1°60 above the 

 normal) offered a great contrast to the preceding month. The 

 mean pressure was 29.785. The clouding but 6.0. Wind remain- 

 ing S. W. fell to a mean of 5.38 per hour. The rain fall was 

 abundant, measuring 4.76 inches, though not on many days. 

 0.1 of an inch of snow fell on the 2nd. We average about three' 

 quarters of an inch of snow early in May. The wind blew a gale 

 on the 26th. 



In June we retrograded sadly in mean temperature. It was 

 scarcely warmer than May; 53°66 in place of a normal of 58°80. 

 With considerable vacillation the barometer resulted in 29.767. 

 It was the most cloudy month of the year ; and the prevalent wind 

 was S. E., though remaining with the small mean of 5.37 miles. 

 The normal June rain fall is 3.44 inches. Last June 7.92 inches 

 fell, making 20 wet days. Twice we had thunder and lightning. 



July was more moderate in every respect. 62°45 was the 

 mean temperature — close to its normal. The barometer was high, 

 mean 29.895. The maximum heat of the year, 86°0, was reached 



