XXIII. 
CLIMATOLOGICAL OBSERVATIONS TAKEN IN HERTFORDSHIRE 
IN 1890. 
Ey John Hopkinson, F.L.S., F.G.S., F.E.Met.Soc., President. 
Read at Watford , 13 th April, 1890. 
Observations were continued during the year 1890 at the five 
stations for which the reports for the three previous years were 
drawn up, and therefore I have only to give similar tables to those 
in my previous reports, and to make a few brief remarks on the 
general result. 
The mean temperature of Hertfordshire in 1890, deduced from 
observations at these five stations, was 0°*6 above that of the 
three previous years, and 0 o, 9 below the mean of 1882-86. The 
mean daily range was 0 o, 8 more than in 1887-89, and 0 o, 2 less than 
in 1882-86. The extreme range was about the same as in 1887, and 
much greater than in 1888 and 1889, this being due to low minima 
in December. The relative humidity, amount of cloud, and rainfall, 
were rather less than in the three previous years; and while the 
rainfall was considerably less than in 1882-86, the number of 
rainy days was rather greater than in those years. While thus 
having about an average temperature and a small rainfall, the year 
1890 had a very wet summer and a very cold December.' 
The observations are made at 9 a.m. at all the stations, maximum 
temperature and rainfall being entered to the previous day. 
HOYSTON. 
(London Hoad.) 
Latitude : 52° 2' 34" N. Longitude : 0° V 8" W. Altitude : 
301 feet. 
Observer: Hale Wortham, F.R.Met.Soe. 
Months 
Temperature of the Air 
Humidity 
Cloud, 0-10 
Rain 
Means 
Extremes 
Am’nt 
Days 
Mean 
Mm. 
Max. 
Range 
Min. 
Max. 
O 
O 
O 
0 
O 
O 
% 
ins. 
Jan.. 
41*6 
36*4 
46-8 
10*4 
23-1 
53-3 
90 
6-9 
1 -8o 
18 
Feb. 
37’i 
3 r6 
427 
11 * 1 
23-0 
510 
89 
6-8 
•80 
9 
March . 
43'i 
34*3 
51-8 
I7'5 
i5'3 
62-8 
85 
6 5 
278 
12 
April.. 
45 A 
36-1 
54’9 
i8-8 
26*2 
647 
82 
5‘3 
•63 
13 
May. 
55*3 
44 - o 
66'6 
22'6 
35'2 
77-0 
77 
5‘o 
1 -84 
12 
June. 
59‘9 
50 0 
69-8 
19*8 
37 9 
78-9 
79 
7‘3 
1-84 
13 
July. 
59‘i 
5 1 ' 1 
6yi 
16 0 
41 - o 
78'9 
77 
6-8 
3-83 
13 
August. 
6 o*2 
5o*3 
70'O 
197 
3 8 *3 
837 
80 
6*o 
1-42 
15 
Sept... 
60-3 
5°'4 
7o'3 
19-9 
38-2 
76-0 
77 
4'5 
•17 
4 
Oct. 
5 0 ’ 1 
42*3 
58*0 
I5‘7 
31-3 
68-i 
80 
5' 1 
1-67 
14 
Nov.. 
42-8 
36-6 
48-9 
127 
15-2 
59'o 
9i 
7‘3 
175 
17 
Dec. 
28-5 
24*1 
32-9 
8*8 
4'3 
42‘3 
88 
8*i 
•55 
11 
Year ..... 
48*6 
40‘6 
56-6 
16-0 
4'3 
83 
6-3 
18*68 
I5i 
