54 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Wisley the amount of sunshine recorded was about one-quarter of 

 the total possible amount. 



The results obtained from the observations taken at the Climato- 



logical Observatory in the gardens at Wisley 



are as follows : 



TVTpfl.n f pTmf^pvfl.f.iTTp nf tVip p.ir in cilifi./lp 



38°'l 



Highest „ „ „ 



53°-2 on the 28th 



Lowest „ ,, ,, 



23°-0 „ 15th 



Lowest „ on the grass 



... 18°-0 on the 15th and 16th 



Number of nights of ground frost 



17 





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





deep. deep. deep. 



Mean temperature of the soil at 9 a.m 



38°-0 39°-5 42°-2 



Highest „ „ „ 



43°-l 41°-8 43°-2 



Lowest „ ,, „ 



32°-9 36°-9 41°-9 



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



represented by 100) 



. ... 89 % 



N 



S 



Fig. 24. — Distribution of Winds during the Year. The relative frequency 



OF CALM is shown BY THE ShADED CiRCLE IN THE CENTRE. 



Eain fell on 13 days to the total depth of 1-11 in. 



(Equivalent to nearly 5J gallons of water to the square yard.) 



Heaviest fall on any day 0*38 in. on the 11th 



The prevailing winds were south-westerly. 



The average velocity of the wind was 5| miles an hour. 



There were 59^ hours of bright sunshine, equal to 23 per cent, of the greatest 



possible amount. 

 There were 15 days on which no sunshine was recorded. 



February.- — The unusually high barometric pressure which 

 governed the weather of January persisted throughout the first half 



