METEOROLOGICAL OBSERVATIONS MADE AT CHISWICK IN 1900. 353 
EEPORT ON THE METEOROLOGICAL OBSERVATIONS MADE 
IN THE SOCIETY'S GARDENS AT CHISWICK IN 1900. 
By Edwaed Mawley, Secretary R. Met. Soc. 
Since the last Report was issued {see Vol. xxiii. 391) there has been no 
change in the position of any of the instruments, and the observations 
have been taken regularly each day at the same hour as before — 9 a.m. 
I have carefully checked the entries made by the Society's observer, 
Mr. T. W. Turner, in the Meteorological Register, but have been unable 
to detect any errors in the observations themselves. Here and there the 
figures in some of the columns had, I found, been incorrectly added up, 
which had led to slight inaccuracies in some of the mean values. These 
inaccuracies have now been set right, and the Society is, I think, to be 
congratulated upon having a set of standard instruments so exceptionally 
w^ell placed, and also in having their indications so accurately recorded. 
In May last I tested all the thermometers, Sec, and found them in good 
working order and reading correctly. 
A brief monthly summary of the observations taken in the Society's 
Gardens at Chiswick in 1900. 
January. — Very warm and very wet. The days were, as a rule, about 
3 degrees warmer, and the nights about 2 degrees warmer, than is season- 
able. On the coldest night the thermometer on the grass showed 15 degrees 
of frost. 
The rainfall was very heavy, being nearly double the average quantity 
for the month. 
Mean temperature of the air in shade ... ... ... ... 39°.9 
Highest 58°.5 on the 24th 
Lowest 25°.2 „ 13th 
Lowest temperature on the grass 
IG'^.S on the 13th and 14th 
At 1 ft. 
At 2 ft. At 4 ft. 
deep. 
deep. deep. 
Mean temperature of the soil at 9 a.m. 
39°.0 
41°3 44°.3 
Highest 
43°.l 
42°.9 44°.9 
Lowest 
35°.6 
39°.6 43°.5 
Mean relative humidity of the air at 9 a.m. 
(complete saturation being repre- 
sented by 100) 
89 
Rain fell on 20 days to the total depth of 
2-98 in. 
(Equivalent to about 14 gallons on each square yard of surface in the Gardens.) 
Heaviest fall on any day 0*48 in. on the 6th. 
On the 28th the ground was covered with snow to the average depth of in. 
Feb ruary. — Cold and exceptionally wet. The days were, as a rule, 
about 1 degree colder, and the nights about 2 degrees colder, than the 
average. On the coldest night a thermometer placed on the surface of 
the snow showed 26 degrees of frost. 
The rainfall was exceptionally heavy, being more than double the 
average quantity for the month. 
