REt»ORT ON METEOROLOQtCAL OBSERVATIONS AT WISLEy. 139 



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



represented by 100) , 73 % 



Eain fell on 19 days to the total depth of 2-35 in. 



(Equivalent to about 11 gallons of water to the square yard.) 



Heaviest fall on any day ... 0-80 in. on the 27th 



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Fig. 65. — Mean Temperature of the Aiu ; Mean Maximum and Minimum 

 Temperatures of the Air ; and Mean Minimum Temperature on the 

 Grass, for each Month. 



The prevailing winds were south-westerly and westerly. 

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



There were 196 hours of bright sunshine, equal to 40 per cent, of the greatest 



possible amount. 

 There was only 1 day on which no sunshine was recorded. 



August. — The month opened with duU, cool weather, but by the 4th 

 an improvement had taken place, and until the end of the first half 



