METEOROLOGICAL OBSERVATIONS AT WISLEY IN 1907. 517 



REPORT ON THE METEOROLOGICAL OBSERVATIONS MADE 

 AT THE SOCIETY'S GARDEN AT WISLEY IN 1907. 



By R. H. Cuktis, F.R.Met.Soc. 



The observations at the Society's^ Climatological Station at Wisley 

 continued to be made daily without break throughout the year. The 

 instruments were as usual examined and verified in the Spring, and were 

 all found to be in good order, whilst a detailed inspection of the obser- 

 vations themselves show them to have been very carefully made. During 

 the year the instrumental equipment of the station was further improved 

 by the addition of a mercurial barometer. 



The principal features of the year's weather are as follows : 

 January. — During the first three weeks of the month a fairly steady 

 type of mild, open, and generally dry weather was experienced, with 

 relatively warm nights ; but during the last week a spell of cold easterly 

 winds, which sometimes blew with considerable strength, set in, and in 

 most parts of the kingdom produced bitterly cold weather. There were 

 a few thunderstorms, and a slight amount of snow ; and over Great 

 Britain rather more than the average amount of sunshine, but rather less 

 than the average amount in Ireland. Slight earthquake shocks were 

 reported at the beginning, and again in the middle of the month. 

 During the last week of the month the barometer rose to a remarkable 

 height over Western Europe, and exceeded 31 inches over the North of 

 England and over Scotland. The month was generally free from very 

 strong winds and gales. 



Observations made at Wisley : 



Mean temperature of the air in shade ... ... ... ... 38°-0 



Highest „ „ „ 51°-3 on the 1st 



Lowest „ „ „ ... 20°-9 „ 24th 



Lowest „ on the grass 10 o, 9 „ 27th 



At 1 ft. At 2 ft. At 4 ft. 

 deep. deep. deep. 



Mean temperature of the soil at 9 a.m. ... 38°-4 40°6 43°-0 



Highest „ „ „ 41°-9 43°-0 44°-0 



Lowest „ „ „ 34°-2 37°-5 41°-1 



Mean relative humidity of the air at 9 a.m. (complete saturation being 



represented by 100) 86% 



Rain fell on 7 days to the total depth of 0-64 in. 



(Equivalent to about 3 gallons of water per square yard.) 



Heaviest fall on any day 0*34 in. on the 1st 



The prevailing winds were westerly. 



The average velocity of the wind was 1\ miles per hour. 



There were 58-7 hours of bright sunshine, equal to 23 per cent, of the greatest 

 possible amount. There were 13 days on which no sunshine was recorded. 



February. — The weather throughout this month was generally quiet 

 and dry, with temperature rather below the average, and with frequent 

 ground frosts which very much retarded the progress of vegetation, and 



