REPORT ON METEOROLOGICAL OBSERVATIONS AT WISLEY. 131 



whole of the central and eastern parts of England. Over the western 

 and northern parts of the Kingdom there was also experienced an 

 unusual amount of cool w^eather, but at times there were bursts of real 

 summer heat, the thermometer rising to over 80° in Scotland and 

 Wales. The mean temperature w^as, however, generally below the 

 average, although owning to the cloudy skies, which not only intercepted 

 the sun's heat by day but also checked radiation by night, the difference 

 was less than might have been expected. At Wisley the temperature 

 at night rarely fell below 50*^ in the screen, and never below 41° 

 on the grass. Bright sunshine w^as, of course, very deficient, and at 

 Wisley only a quarter of the possible amount was registered. London 

 was still less favoured, having only 20 per cent, of its possible 



Fig. 66. — Distribution of Winds During the Year. 

 The relative frequency of calm is shown by the shaded circle in the centre. 



amount, and some usually very sunny parts of the Norfolk and Suffolk 

 coast received only 16 per cent. On the other hand at many places 

 along the western coast of Britain and in Ireland considerably more 

 tlian the average amount was recorded. Eainfall was not very differ- 

 ent from the average ; there was a deficiency in the extreme north, and 

 also in the south of Ireland, but over a considerable part of the King- 

 dom the fall exceeded the average, although not to a very great degree. 

 The prevailing winds were from between south-w^est and north-west. 

 The results from Wisley are as follows : — 



Mean temperature of the air in shade 58°.7 



Highest „ „ „ ... . ... 74°.4 on the 28th 



Lowest „ „ „ 45°.3 „ 4th 



Lowest ,, on the grass ... 40°. 8 „ 19th 



There were no ground frosts. 



P 2 



