REPORT ON METEOROLOGICAL OBSERVATIONS AT WISLEY. 61 



The results from Wisley are as follows : 



Mean temperature of the air in shade 67°-l 



Highest „ „ „ 96°-2 on the 9th 



Lowest „ „ „ 43°-2 „ 31st 



Lowest „ on the grass 37°-2 „ 31st 



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

 deep. deep. deep. 



Mean temperature of the soil at 9 a.m 67°-7 66°-6 64°-2 



Highest „ „ „ 70°-7 68°-3 65°-0 



Lowest „ „ „ 62°-2 63°-7 63°-2 



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



represented by 100) 72 % 



Rain fell on 6 days to the total depth of 0*62 in. 



(Equivalent to nearly 3 gallons of water to the square yard.) 



Heaviest fall on any day 0*28 in. on the 28th 



The prevailing winds were south-westerly, but on several days it blew from south-east 



or north-east. 



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



There were 255 hours of bright sunshine, equal to 58 per cent, of the greatest 



possible amount. 

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



September. — The wonderfully warm weather of July and August 

 continued throughout the first half of September, and on the 8th 

 the screened thermometer at Wisley rose to 91°, and to 93° 

 at Greenwich Observatory and at a few other places in the south-east 

 of England — the highest readings ever recorded there so late in the 

 year. The latter half of the month was much cooler, and night frosts 

 occurred several times, the thermometer on the grass at Wisley falling 

 to 28°, and in the screen to 35° during the night of the 

 28th. The amount of bright sunshine continued to be large; at 

 Wisley it averaged eight hours a day, and it exceeded the average 

 all over the kingdom. The fall of rain was still much below the 

 normal amount, and over the midland and southern counties, and 

 also over the eastern half of Scotland and north-eastern Ireland 

 it was generally well under 2 inches; at Wisley it amounted to 

 only an inch, and fell on nine days. The depth of water in a 

 well at Wisley which is regularly gauged had fallen to 5^ feet in 

 July, and it continued at about that depth till the close of this month, 

 instead of showing about 8 feet, as is usual throughout the summer; 

 this indicated the excessive dryness of the soil, which made it difficult 

 to carry out the ploughing and other operations usual at this season. 



The results from Wisley are as follows : 



Mean temperature of the air in shade 59°-l 



Highest „ „ „ 91°-0 on the 8th 



Lowest „ „ „ 35°-4 „ 22nd 



Lowest „ on the grass 28^-0 „ 22nd 



Number of nights of ground frost 4 



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

 deep. deep. deep. 



Mean temperature of the soil at 9 A.M 60°-3 61°-3 61°-6 



Highest „ „ „ 65°-7 64°-5 63°-l 



Lowest „ „ „ 54°-7 57°-6 59°-0 



