172 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



a slight predominance of south-westerly winds in most districts, and their 

 force was upon the whole moderate. The temperature was very generally 

 below the average, the highest readings of the thermometer occurring 

 about the middle of the month., and the lowest about a week earlier, the 

 range between the two extremes being considerable. Rainfall was slightly 

 in excess of the normal amount in most districts, but at Wisley it was 

 below the usual amount. Sunshine was everywhere deficient in amount, 

 and especially so over the south-western counties, where the month 

 proved to be an exceptionally dull one. 

 Observations made at Wisley : 



Mean temperature of the air in shade 



46°.8 





Highest „ „ „ ... 



61°-.2 on the 



16th 



Lowest „ „ „ ... 



32°.l „ 



7thA Bth 



Lowest „ on the grass 



21°.7 „ 



7th 





At 1ft. At 2ft, 



At 4 ft. 





deep. deep. 



deep. 



Mean temperature of the soil at 9 a.m. ... 



46°.7 47°.4 



46°.7 



Highest „ „ „ ... 



50°.0 49^.6 



47°.7 



Lowest „ „ „ 



43°.0 45°.7 



45 3 .9 



Mean relative humidity of the air at 9 a.m. 



(complete saturation being 



represented by 100 ) 





80 



Rain fell on IS days to a total depth of 





1-44 in. 



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

 Heaviest fall on any day ... ... ... ... ... 032 in. on the 9th and 30th 



The prevailing winds were south-westerly but winds blew with nearly equal frequency 



from all points. 

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



There were 103 hours of bright sunshine, equal to 25 per cent, of the total possible 

 amount, and — for the third month in succession — there were but 4 entirely sun- 

 less days. 



Afay. — A quiet month, with fine, bright weather, and on the whole 

 rather warmer than usual, although there was a well-marked cold period 

 during the first week and another at the beginning of the fourth week . 

 Thunderstorms traversed the south-east of England on the 80th. 



Northerly to north-easterly and westerly to south-westerly winds were 

 those most generally experienced, but their force was usually moderate or 

 light. The mean temperature nowhere differed greatly from the average, 

 but in most places it was slightly in excess ; the warmest pericd was the 

 third week, and more particularly the latter half of it, when upwards of 

 80" was registered in the south-east of England and 79M at Wisley. 

 The rainfall was generally small, and the number of days on which rain 

 fell was few. At the Garden the fall was less than half an inch — only 

 one-third of the normal amount — and this was spread over seven days. 

 The amount of sunshine was much above the average over the southern 

 counties, but it became less as one proceeded northwards, till in the 

 north-east of England and in Scotland it amounted to less than the 

 average. 



Observations made at Wisley : 



Mean temperature of the air in shade 52 .4 



Highest „ „ „ 79M on the 29th 



Lowest „ „ „ 29°.3 „ 23rd 



Lowest .. on the grass ... ... ... ... ... 22°.0 „ 23rd 



