MONTHLY TEMPERATURE AT OLD TRAFFORD. 



275 



Table II. contains the difference of the mean tempera- 

 ture of each month from that of the whole period, 1849 

 to 1868 ; but unfortunately the month of August is almost 

 entirely deficient in the earlier series, and this is a gap I 

 see no chance of filling with observations made at any sta- 

 tion which would be at all fairly comparable with the re- 

 mainder of the series. 



The mean temperatures of the months of the various 

 periods have been as follows : — 



January 



1849 to i860. 



1861 to 1868. 



1849 to 1868. 





 38-3 

 37-8 

 41-3 

 46-6 

 51-8 



57-5 

 6o'5 



55"2 

 48-5 



41'2 



38-9 







37-2 

 38-9 



40-1 



46-8 



517 

 56-4 



58-3 

 57-6 



55-1 

 49-0 

 411 



40-4 





 37-8 

 38-2 

 40-8 

 46-6 



517 

 57-0 

 59-6 

 587* 



55-1 

 48-7 

 41*2 

 40-4 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 





Mean 





47'3 



47*9 





The mean of the period 1861 to 1868 appears to have 

 been on the whole rather colder than the average of the 

 last twenty years, and apparently chiefly owing to the 

 lower mean temperature of the month of July — July only 

 exceeding 6o°'0 in two years, 1865 and 1868, whilst in 

 the earlier period July in six years exceeded 60'^- o, viz. in 

 1850, 1852 (67°-9), 1854, 1855, 1857, 1859. 



On examination of the mean variations of temperature 

 for each month (Table II.), we find that the greatest 

 amount of variation of the mean monthly temperature 

 may be expected in February, and the least in October ; 



* From 9 years only. 



T 2 



