METEOROLOGICAL OBSERVATIONS AT WISLEY IN 190G. 231 



point, and in consequence, whilst there were no very warm periods, yet the 

 nights were not very cold, and frosts were infrequent and the range of 

 temperature small. There were a few thunderstorms about the middle 

 of the month, but no snowstorms of importance. There were very few 

 heavy rains, although more than the average amount fell in the course of 

 the month nearly everywhere. The amount of bright simshine was, 

 however, in excess of the average all over the kingdom, and in many 

 places the excess amounted to an average of more than 1^ hour per day. 

 Observations made at Wisley : 



Mean temperature of the air in shade 38°-0 



Highest „ „ „ 50°-3 on the IGth 



Lowest „ „ „ 24°-8 „ 22ncl 



Lowest „ on the grass 18°-8 „ 6th 



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

 deep. deep. deep. 



Mean temperature of the soil at 9 a.m 38°'3 40°-4 42°-2 



Highest „ „ „ 41°-7 42°-6 43°-5 



Lowest „ „ „ 35°-8 38^-8 41°-3 



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



represented by 100) 87% 



Kain fell on 21 days to the total depth of 1-70 in. 



{Equivalent to about 8 gallons of water per square yard.) 



Heaviest fall on any day 0*37 in. on the 17th 



The prevailing winds were south-westerly and westerly. 

 The average velocity of the wind was 8^ miles per hour. 



There were 83*3 hours of bright sunshine, equal to 30 per cent, of the total possible 

 amount. There were 7 days without sunshine, 



Mao'ch.— -The weather of the first half of this month was in marked 

 contrast to that of the latter half. At first the winds were southerly to 

 westerly, the temperature unusually high, with clear skies and a large 

 amount of sunshine. Then towards the middle of the month there came 

 a spell of cold northerly wind, with snow nearly everywhere, followed 

 soon after by heavy rain and a sudden rise in temperature which caused 

 considerable floods in some districts. Following this the type of w^eather 

 became entirely changed, and cold northerly to north-easterly winds 

 became general, wdth only a little rain and with several bright, sunny, 

 but cold periods. The temperature was therefore generally below the 

 average for March, and its range was large ; but the rainfall was slight, 

 and the amount of sunshine greater than is usual in March. 



Observations made at Wisley : 



Mean temperature 



of the air in shade 





41°-8 





Highest ,, 



5) >) • • • 





63°-7onthe 7th 



Lowest ,, 







24°-4 



„ 23rd 



Lowest „ 



on the grass 





170.4 



„ 23rd 







At 1 ft. 



At 2 ft. 



At 4 ft. 







deep. 



deep. 



deep. 



Mean temperature 



of the soil at 9 a.m 



41°-1 



42^-5 



43°-0 



Highest ,, 





45°-2 



45°-0 



440.1 



Lowest ,, 





38° 0 



40°-6 



41^-7 



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



represented by 100 82% 



Eain fell on 18 days to the total depth of 1-25 in. 



(Equivalent to nearly 6 gallons of water per square yard.) 



