TAKEN IN HERTFORDSHIRE IN 1887. 
205 
In the ‘ Elora ’ results are also given of climatological observa¬ 
tions (temperature, humidity, rainfall, and cloud) at Royston, 
Watford, and New Barnet, and also, for comparison, at Greenwich, 
for the 5 years 1882 to 1886, the longest period during which the 
required observations have been made at all these places, Barnet 
having the shortest complete record and consequently giving the 
limit. The table in the ‘Elora’ does not give the mean minimum 
and maximum temperatures, and the mean temperature given is 
not the simple mean of the minimum and maximum readings, the 
mean in Mr. Glaisher’s tables from which the results for Royston 
and Barnet were taken being corrected (reduced to mean values) 
for diurnal range of temperature.* I therefore here substitute for 
this table one giving data with which the results in the present 
report are strictly comparable, the mean temperature being the 
mean of the min. and max. readings. It will be noticed that the 
mean temperature for these five years is one degree higher than 
that deduced above for a longer period, and that the mean rainfall 
is two-tenths of an inch less. It is perhaps scarcely necessary to 
state that the temperature throughout, being that of the air, is the 
temperature in the shade. 
Results of Climatological Observations , 1882-86. 
Stations 
Temperature of the Air 
Humidity 
Cloud, 0-10 
Rain 
Means 
Extremes 
Am’nt 
a 
ft 
Mean 
Min. 
Max. 
Range 
Min. 
Max. 
O 
O 
O 
O 
O 
0 
% 
ins. 
Royston. 
49 -i 
41-2 
57 -o 
15-8 
7.7 
92*2 
84 
6-2 
24-56 
154 
Watford.... 
48-9 
41 ’6 
56-2 
14-6 
137 
90’O 
82 
6 8 
28-82 
181 
Barnet . 
48-4 
39-5 
57 ' 2 
177 
7-0 
90‘8 
83 
6-5 
25-32 
150 
Mean. 
48-8 
40-8 
56-8 
i6*o 
9 5 
91-0 
83 
6-5 
26-23 
162 
Erom the last of the following tables it will be seen that the 
mean temperature of Hertfordshire in 1887, as far as can be deter¬ 
mined from observations at our five meteorological stations, was 
l°-8 lower than the mean of our period of five years, 1882-86, 
that the mean daily range of temperature was 0 o, 2 greater, the 
relative humidity 2 per cent, less, the amount of cloud the same, 
and the rainfall 7*16 ins. less on 11 fewer days. 
The year 1887 therefore appears to have been cold, and dry, not 
only having a small rainfall and a small number of rainy days, but 
also a comparatively dry atmosphere. 
* For the reports for my own meteorological station I have deduced the mean 
temperature from the minimum, maximum, and 9 a.m. readings. The mean at 
9 a.m. for the 5 years 1882—86 being 48 °- 9 , exactly the same as the mean of 
the min. and max., the exclusion of the 9 a.m. values in computing the present 
table makes no difference in the result, the mean temperature for Watford here 
stated thus being the same as that given in the ‘ Flora.’ 
