REPORT ON METEOROLOGICAL OBSERVATIONS, WISLEY, 1913. 61 



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

 represented by 100), 76 per cent. 



Rain fell on 9 days, to the total depth of 1*44 in. (equivalent to about 6| gallons 

 of water to the square yard). Heaviest fall on any day 0-79 in., on the 31st. 



The prevailing winds were north-easterly, and south-westerly. 



The average velocity of the wind was 4 miles an hour. 



There were 143 hours of bright sunshine, equal to 32 per cent, of the greatest 

 possible amount. 



There were 2 days on which no sunshine was recorded. 



September. — After the opening days of this month a welcome change 

 took place in the character of the weather, and the winds, getting round 

 to more easterly and southerly points, brought with them a more 

 seasonable state of things, with the result that the mean temperature 

 for the month was rather above the average, instead of being below it, 

 as in so many previous months. It was also a quiet month, without 

 strong winds ; but the drought was broken, and although some localities 

 still continued to get less than their normal rainfall, the greater part of 

 the kingdom had no cause for complaint in that direction, and several 

 districts had considerably more rain than usual. But the weather 

 was still rather dull, and bright sunshine was less prevalent than is 

 usual in September ; a few places, London being one of them, were 

 favoured with rather more than the normal amount, but some parts of 

 the south-west did not receive much more than half the usual quota. 



The records at Wisley give the following results : 



Mean temperature of the air in shade 



. 58-2 



3 





Highest „ „ „ „ • . 



. 76^ 



on the 



27th 



Lowest „ „ „ „ • . 



. 40° 



)) 



loth 



Lowest „ on the grass 



. 30^ 



>> 



loth 



Number of nights of ground frost . 







I 





At 



depth of 







I ft. 



2 ft. 



4 ft. 



Mean temperature of the soil at 9 a.m. 



. 58-3" 



58-7° 



57-8° 



Highest 



. 61° 



61° 



59' 



Lowest ,, ,, „ 



. 56° 



57" 



57° 



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

 sented by 100), 87 per cent. 



Rain fell on 11 days, to the total depth of 2*25 in. (equivalent to about 10 J 

 gallons of water to the square yard). Heaviest fall on any day i'02 in., on 

 the ist. 



The prevailing winds were south-easterly. 



The average velocity of the wind was 4 miles an hour. 



There were 138 hours of bright sunshine, equal to 37 per cent, of the greatest 

 possible amount. 



There were 3 days on which no sunshine was recorded. 



October. — With the advent of October a somewhat different type 

 of weather set in — ^unsettled, mild, and with frequent and heavy falls 

 of rain. Winds from some southerly point were the most frequent, 

 and the air was unusually soft and mild — indeed, the unusual warmth 

 was the distinctive feature of the month ; there was practically no 

 cold weather, and at Wisley the daily maxima ranged between 53° 



