Contribution to Meteorology. 118 



Providence it reached 32° — , at Quebec 39°. 5 — ; while more 

 south the weather was somewhat moderate, but was accompanied 

 by very heavy snow-storms. 



In Montreal the record of my friend Dr. Hall indicated on the 

 18th a temperature of only 20°— (below zero); on the 23d, 

 27°— ; and on the 24th, 25. 7—. 



The Mean of Humidity for the year was 0.822, and indicated 

 0.008 of moisture above the average of the last seven years. The 

 mean humidity for January was 0.925, for February 0.350, for 

 March 0.826, for April 0.821, for May 0.753, for June 0.786, for 

 July 0.800, for August 0.848, for September 0.823, for October 

 0.859, for November 0.871, and for December 0.800. Complete 

 saturation occurred but at one observation during the year. 



Rain fell on 105 days. It rained 556 hours 8 minutes, 

 and amounted to 48.251 inches on the surface. This depth ex- 

 ceeds by 5.147 inches the mean yearly amount of the last seven 

 years. On 19 days, the rain was accompanied by thunder and 

 lightning. 



Snow fell on 50 days. It snowed 273 hours 15 minutes, and 

 amounted to 86.98 inches on the surface. This amount shows a 

 decrease of 8.78 inches from the mean of the last seven years. 



The greatest amount of rain fell in October, and indicated 

 6.823 inches ; the least amount in January, and was inappre- 

 ciable. 



The greatest amount of snow fell in December, and reached 

 26.81 inches. The least amount fell on the 29th September 

 being the first snow of the autumn. The last snow in spring fell 

 on the 27th of April. 



Evaporation. — The amount of water evaporated from the sur- 

 face during the months of April, May, June, July, August Sep- 

 tember, and October amounted to 20.245 inches, which amount 

 represents very nearly the average of the last seven years. The 

 amount of ice evaporated during the remaining months gives an 

 equivalent of 9.57 inches of evaporation from the surface. The 

 monthly amount of evaporation bears a striking proportion to the 

 bumidity of the air, and to the velocity and the direction of the 

 wind. 



Winds. — The most prevalent wind during the year was the 

 Westerly, and the least was the East. The whole amount of 

 wind for the year was 54,425.10 miles, which shows an increase 

 of 1,363.47 miles over the amount of last year. The mean velo- 



c 



