162 METEOROLOGY. 



The mean temperature of the four seasons was aa follows : 



For the Winter, including Dec., 185*7, 26.29° which is 4.90° higher than that of 

 the preceding "Winter, and 2.08° above the average. 



For Spring, 39.60° which is 2.25° higher than that of the preceding Spring, and 

 1.07° below the average. 



For Summer, 67.21° which is 3.88° higher than that of the preceding Summer, 

 and 2.34.° above the average. 



For Autumn, 47.35° which is 1.48° higher than that of the preceding Autumn 

 and 0.68° above the average. 



The mean temperatures of the several months were in eight instances above and 

 and in four below the averages for those months. July and February were as 

 usual the warmest and coldest months as compared with other months in the year, 

 but estimated by the deviation of their temperatures from their respective averages, 

 January was the warmest month and February the coldest. 



The mean temperature of the warmest day, which was 79.98°, exceeded the 

 nineteen years average by 2.56°. It occurred on June 26, which is 24 days earlier 

 than the average date of the warmest day, but 32 days earlier than its normal 

 date, or date derived from the normal curve of temperature for Toronto, a curve 

 in which by the employment of five day groups accidental irregularities are 

 eliminated. The mean temperature of the coldest day, which was + 1.60°, 

 exceeded the average by l.S"^. It occurred on Feb. 17, which is 22 days later than 

 the average date of the coldest day, and 3 days later than the normal date of the 

 coldest day. 



The highest temperature of the year was 90.2°, or 0.5° lower than the average 

 maximum of 19 years. It occurred on June 26, already mentioned as the warm- 

 est day, and 30 days earlier than the averarge date of its occurrence. The mini- 

 mum temperature of the year was — 7.3° or 3.8° higher than the average minimum. 

 It occurred on Feb. 17, already mentioned as the coldest day, or 24 days later than 

 the date at which, on the average, the absolutely lowest temperature has occurred. 

 The range of temperature for the whole year, 97.5°, was less than the average 

 by 4.2°. 



Humidity. — The mean humidity of the year was 0.73, the greatest monthly 

 humidity being in December, and the least in April, facts which conform very 

 nearly to the experience of the past eighteen years, which give January and May 

 as the dampest and driest months as regards the vapour suspended in the atmos- 

 phere. There were but three instances of perfect saturation, one in November and 

 two in December, and the day when on the whole the atmosphere was most damp 

 was March 15, when the mean humidity was .96. The instance of greatest 

 atmospheric dryness was .08, at 4 p.m. of April 16 ; and the dryest day on the 

 whole was May 3, with a mean humidity of .39. 



Clouds. — The extent of sky clouded was on the average f of the whole hemis- 

 phere, and for nine months the sky was on the average at least half over-cast 

 December was the most cloudy month, and September the month most free from 

 clouds. This harmonises with experience as regards December, but the month in 



hich on the whole clouds usually prevail least is July. Considered with refer- 



