REPORT ON METEOROLOGICAL OBSERVATIONS, WISLEY, 1913. 57 



the fall of rain was in excess of the average, but at Wisley and indeed 

 over the greater part of south-eastern England it was below it, and 

 in some districts the fall did not amount to an inch. Conversely^ 

 whilst the amount of bright sunshine experienced in m^ost parts of 

 the kingdom was below the normal, in the south-east it was slightly 

 above it, Wisley having an average of 7 hours per day and London 

 6J hours. 



N 



s 



Fig. 21. — Distribution of Winds during the Year. The Relative 

 Frequency of Calms is shown by the Shaded Circle in the Centre. 



The Wisley records give : 



Mean temperature of the air in shade 





. 54-5° 





Highest „ „ „ „ . . 





. 80° on the 



26th 



Lowest „ „ „ „ . . 





• 35° 



7th 



Lowest „ ,, on the grass 





. 28° 



7th 



Number of nights of ground frost . 







. 5 







At depth of 









I ft. 2 ft. 



4 ft. 



Mean temperature of the soil at 9 a.m. 





. 54-9° 52-8° 



50-8° 



Highest 





. 62° 59° 



55° 



Lowest „ „ 





. 50° 49° 



48° 



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

 represented by 100), 75 per cent. 



Rain fell on 10 days, to the total depth of i'68 in. (equivalent to about 7! 

 gallons of water to the square yard). Heaviest fall on any day o-6i in., on the 

 29th. 



The prevailing winds were southerly. 



The average velocity of the wind was 6 miles an hour. 



There were 219 hours of bright sunshine, equal to 46 per cent, of the greatest 

 possible amount. 



Theie were 3 days on which no sunshine was recorded. 



