220 J. HOPKmsox — the climate of st. albaits. 



The annual mean daily range of temperature, 14°*4, varied from. 

 13°-0 in 1888 to 16°-6 iii 1898. 



Autumn is warmer than spring by l°-2, almost entirely owing to 

 the colder nights in spring; but the excess of the temperature of 

 summer over that of winter is more due to the warm days in 

 summer than to the cold nights in winter. Spring is 10°*8 wanner 

 than winter, and summer 12°"2 warmer than spring; autumn is 

 11°"0 colder than summer, and winter 12°'0 colder than autumn. 

 Thus winter passes more slowly into spring than does spring into 

 summer, while summer passes rather more slowly into autumn than 

 does autumn into winter. 



The mean daily range of temperature is greatest in summer and 

 least in winter, and greater in spring than in autumn ; but the 

 absolute range has been greatest in spring and least in winter, and 

 greater in autumn than in summer. The nights are much colder in 

 spring than in autumn, while the days have very nearly the same 

 temperature in each season ; in summer they are not nearly so 

 much warmer than in autumn as are the days. 



January is on the average the coldest month, and July the 

 warmest. The temperature increases from January to July, and 

 decreases from July to January, as follows : — 

 Increase : ^ 



Jan. to Feb. TO 



Feb. to March 4-0 



March to April 5-2 



April to May 6-3 



May to June 6-4 



June to July 1"6 



Assuming that the mean temperature of each month occurs about 

 the middle of the month, it would appear that the increase of 

 temperature is most rapid during the month of May, or from the 

 middle of April to the middle of June ; and that the decrease is 

 much the most rapid during the months of September and October. 



Both the days and the nights are coldest in January and warmest 

 in July. 



The mean daily range of temperature is least in January and 

 greatest in June. The increase and decrease are as follows : — 



o o 



Jan. to Feb. +1-4 July to August — 0-5 



Feb. to March +2-4 August to Sept. — 0-8 



March to April +3-0 Sept. to Oct. —2-1 



April to May +0-7 Oct. to Nov. —2-7 



May to June +0-6 Nov. to Dec. 0-0 



June to July — 1-7 Dec. to Jan. — 0-3 



Thus the mean daily range increases in the early part of the year 

 ■January to June) more rapidly than it decreases in the rest of the 

 year (June to January). The greatest increase (March to April) is 

 due to the cold nights (not to warm days) in April. 



Temperatures below freezing-point (32°) have occurred in every 

 month but the three months of summer and the first month of 

 autumn — June to September. Only once has the temperature been 



