GOO 



MK ROBERT COCKBURN MOSSMAN ON 



The following are the monthly extremes : — 





Greatest. 



Date. 



Least. 



Date. 



Difference. 



January, .... 







11-2 



26 



8-8 



31 



o 



2-4 



February, 









11-3 



26 



9-5 



10 



1-8 



March, . 









14-6 



31 



10-5 



3 



4-1 



April, . 









16-1 



29 



13-0 



8 



3-1 



May, . 









17-0 



31 



14-4 



11 



2-6 



June, 









17-0 



20 



14-0 



25 



3-0 



July, . 









16-3 



16, 17 



13-9 



25 



2-4 



August, . 









15-9 



1 



13-1 



21 



2-8 



September, 









15-8 



8 



12-0 



24 



3-8 



October, 









13-3 



1 



10-5 



24 



2-8 



November, 









11-4 



7 



8-7 



20 



2-7 



December, 









12-1 



o 



8-3 



i 



3-8 



The mean daily range of temperature is above the annual average from March 21 

 to October 2, if we except the five days, March 26-28 and September 24-25, when 

 it is slightly under the mean. 



Variability of Temperature. 



The variability of temperature has been computed for each day during the fifty years 

 1840-51, 1857-94. The first stage of the operation was to strike the arithmetical mean 

 of the maximum and minimum temperatures. Then the day to day differences in the 

 mean temperature of successive days were computed and entered into 366 columns corres- 

 ponding to the 365 days in the year, and the extra day in leap year. These values 

 were then added up, the gross totals being given in Table XIII. under the heading of 

 " Cumulative Temperature Variability." Cumulative values have been given instead of 

 means, the variation being extremely small, as will be apparent from the following table 

 showing the highest and lowest mean variabilities in each month. 





Highest. 



Date. 



Lowest. 



Date. 



Range. 



January, .... 



4-2 



1 



2-6 



22 



1-6 



February, 









3-8 



2 



2*2 



25 



1-6 



March, . 









3-5 



17 



2-2 



25 



1-3 



April, . 









3-3 



12 



2-1 



8 



1-2 



May, . 









3-3 



5 



2-3 



12 



1-0 



June, . 









3-6 



4 



2-1 



14 



1-5 



July, . 









3-1 



18 



2-0 



25 



1-1 



Aujni-t, 









2-9 



12, 26, 27 



1-9 



24 



1-0 



September, 









3-1 



27 



2-2 



13 



0-9 



October, 









3-9 



25 



2-2 



7 



1-7 



November, 









4-0 



30 



2-3 



11 



1-7 



1 >' comber, 









3-9 



29 



2-7 



10 



1-2 



