REPORT OX METEOROLOGICAL OBSERVATIONS, WISLEY, 1918. 91 



year ended with the warmest December experienced in Great Britain 

 for many years. In the British Isles as a whole the mean temperature 

 for the year was slightly above the normal, but nowhere was the 

 departure at all large. 



In the following paragraphs the weather of each month is dealt 

 with in more detail. The results of the daily observations made at 

 the Observatory in the Gardens are summarized for each month in 

 the following table : 



Summary of Results of Daily Observations made at the 

 Climatological Observatory in the Society's Gardens at 

 Wisley. 





Temperature. 



Rainfall. 



Wind. 





atura- 



Sunshine. 





Air. 



Soil. 



a 



;ured. 









Vapour in Air. Complete S: 

 tion = 100. Per Cent 



d 









Mean Temperature. 



Highest Temperature. 



Lowest Temperature. 



Lowest Temperature 

 on Grass. 



jNo. of Ground Frosts. 



No. of Days of Rai 



Amount of Rain meaJ 



Equivalent in Gallc 

 per Sq. Yard. 



Prevalent 

 Direction. 



Mean Hourly Veloc 

 Miles per hour. 



No. of Hours record 



Per Cent, of Possil 

 Amount. 



No. of Sunless Da; 



January . 



0 



39 



56 



0 



18 



0 

 4 



25 



.4 



3-20 



15 



S'ly. 



6 



91 



60 



23 



9 



February . 



43 



57 



20 



9 



14 



18 



0-99 



4* 



S.W. to 

 S.E. 



8 



88 



73 



26 



9 



March 



43 



69 



25 



13 



28 



8 



0-82 



4 



N.E'ly. 



6 



84 



149 



41 



4 



April 



45 



64 



30 



18 



17 



18 



3-72 



17 



N.E'ly. 



5 



88 



85 



16 



9 



May 



56 



83 



39 



27 



8 



9 



1-69 



8 



N.E. & 

 N.W. 



4 



74 



240 



50 



3 



June 





79 



37 



26 



11 



8 



i-34 



6 



N'ly. 



4 



67 



240 



48 



nune 



July 



61 



80 



- 



31 



2 



18 



576 



27 



S.W'lv. 



5 



73 



209 



42 



none 



August 



59 



88 



44 



- 



1 



9 



0-82 



4 



S.W. & 

 N.W. 



4 



75 



194 



43 



1 



September 



56 



72 



35 





3 



20 



563 



26 



S.W'ly. 



7 



81 



159 



. 43 



3 



October . 



50 



63 



30 



20 



15 



14 



1-18 



5* 



S.W'ly. 



4 



89 



79. 



26 



8 



November 



43 



58 



24 



17 



22 



15 



2-39 



4 



S.W'ly. 



3 



* 



9i 



69 



27 



8 



December 



47 



58 





16 



11 



17 



2-02 



9* 



S.W'ly. 



8 



93 



33 



14 



15 



January was unusually cold during its first half, and then remark- 

 ably mild throughout the latter portion, the two periods being 

 respectively quite typical of winter and of spring. A very heavy 

 downpour of rain and sleet on the 13th brought the first period to a 

 close, the fall at the Gardens measuring nearly an inch and a half, 

 and although the wet weather continued for several days afterwards 

 it nevertheless became very mild and spring-like, the temperature 



