142 PROCEEDINGS COTTESWOLD CLUB 1913 



happened to be several very dry years, with the result that 

 the annual average for that period was no more than 25-3 

 inches. The extremes of annual rain measured in the whole 

 35 years are represented by the minimum of 19-4 inches in 

 1892, and 37-9 inches in 1882. 



The number of days upon which rain fell averaged for 

 the 21 years 177 days per annum, and in the 35 years 195 days. 



The Humidity of the Atmosphere. — The percentage 

 humidity has been recorded twice daily at 9 a.m. and 9 p.m. 

 during 35 years in Cheltenham, 25 years by the late Mr Tyrer 

 at Southam House, Prestbury Road, and 10 years by Mr Saxby 

 at the MontpelHer Gardens. The difference in these locations, 

 the first-mentioned being near the Wyman's brook, which 

 expanded into a pond in Mr Tyrer's garden, and the latter 

 being on slightly higher ground, not near to any expanse of 

 water, apparently caused a difference in the humidity averaging 

 I per cent. This fact shows that variations in humidity may 

 occur in the same town in different parts, and I should expect 

 a greater difference than noted as between the two stations 

 above mentioned would be obtained between a part thickly 

 covered with trees and a part bare of trees upon some days in 

 summer time. 



The mean annual humidity at 9 p.m. invariably worked 

 out to a higher figure than at 9 a.m., though this may not 

 mean that it was so upon every day of every year, but only 

 that it was usually so. 



The normal annual humidity for a long period of years is 

 82 per cent, in the morning at 9 o'clock and 85 per cent, in the 

 evening at 9 o'clock, with daily minimums occasionally well 

 below 70 per cent., and daily maximums occasionally well 

 over 90 per cent., after the means between morning and 

 evening reckonings have been struck. 



The relative humidity of the air is greater in the winter 

 than in the summer months when temperatures are higher. 

 This observation, like many of those above, is in no way 

 peculiar to this or any other limited district, being practically 

 of universal application in this country. 



