802 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



KEPORT ON THE METEOROLOGICAL OBSERVATIONS MADE 

 IN THE SOCIETY'S GARDENS AT CHISWICK IN 1901. 



By Edward Mawley, Past-President R.Met.Soc. 



There has been no change during the year in the position of any of the 

 instruments, and the readings have been taken regularly, as in the two 

 previous years, at 9 a.m. each day. The observations reflect great credit 

 on the observer, Mr. T. W. Turner. After carefully checking the entries 

 in the observation book I have been able to detect but six entries which 

 appeared to me in any way doubtful, and there were only five instances 

 in which the adding up of any of the columns was inaccurate. In June 

 last I tested all the thermometers and found them in good working order 

 and reading correctly. 



A Brief Monthly Summary of tJic Ohservations taken in the Society's 



Gardens at Chiswick in 1901. 



January. — Warm and dry. The days were as a rule about 1 degree 

 warmer, and the nights about 1 degree warmer, than is seasonable. On 

 the coldest night tlie thermometer on the grass showed 13 degrees of 

 frost. 



The rainfall was light, being less than half the average quantity for 

 the month. 



Mean temperature of the air in shade 

 Highest 



Lowest „ ,, ,, 



Lowest „ on the grass 



39°.0 



54°.6 on the 27th 

 2f)°.5 „ 8th 

 19M „ loth 



At \ It. At 2 ft. At 4 ft. 

 deep deep. deep. 



Mean temperature of the soil at 9 a.m. ... ... ... 40°.5 43°.4 46°. 3 



Highest „ „ „ 44°.4 45°.6 48°.l 



Lowest „ „ „ 37°.3 41°.8 45°.3 



IMean relative humidity of the air ;il 9 a.m. (complete saturation being 



represented by lOOj ... ... ... ... ... ... ... ... 88 



Eain fell on 11 days to the total depth of 0-85 in. 



(Equivalent to about 4 gallons on each square yard of surface in the Gardens.) 

 Heaviest fall on any day ... ... ... ... ... ... 0-17 in. on the 27th 



On the 8th the ground was covered with snow to the average depth of ... 2 ins. 



February. — Very cold and rather dry. The days were, as a rule, about 

 4 degrees colder, and the nights about 3 degrees colder, than is seasonable. 

 On the coldest night the exposed thermometer showed 17 degrees of frost. 



The rainfall was rather light, being about a quarter of an inch less 

 than the average quantity for the month. 



Mean temperature of the air in shade ... ... ... ... 36°.2 



Highest „ „ „ 51"'.6onthe28th 



Lowest „ „ „ 20°.7 „ 14th 



Lowest „ on the grass ... 14^.6 „ 14tli 



