J. HOPKINSON-CLIMATE OF HERTFORDSHIRE. 
127 
and maximum temperatures, very closely agree at Berkhamsted,*' 
St. Albans, and Bennington, but that the mean minimum (or night) 
temperature at New Barnet is considerably lower than it is at 
any of the other four places, and also that the mean maximum 
(or day) temperature at Royston and New Barnet is considerably 
higher than it is at any of the other three places. The low mean 
minimum temperature at New Barnet is probably due in part to the 
kind of stand used, and in part to the nature of the sub-soil, London 
Clay, which retains moisture and induces ground-fogs by which the 
air is rendered colder at night than it would be in a higher position 
and on a drier stratum. The high maximum temperature at 
Royston and New Barnet is fully accounted for by the Glaisher 
stand being used at these two stations. The mean minimum at 
Royston is unaccountably high, taking into consideration the kind 
of stand used there, and it is remarkable that this, the most northern 
station, should have the highest mean temperature. The only other 
point in this table calling for remark is the small number of days 
of rain at New Barnet, which is owing to the omission of slight 
falls of rain and snow; but this does not sensibly affect the amount 
registered, for the water, except perhaps a very small quantity 
which may evaporate, remains in the gauge until measured with 
the next fall. 
Results of Climatological Observations for each Station, 
1887-1898, 
Stations 
Temperature of the Air 
Humidity 
Cloud, 0-10 
Rain 
Means 
Extremes 
Amount 
CQ 
Q 
Mean 
Min. 
Max. 
Range 
Min. 
Max. 
° 
O 
O 
O 
0 
O 
°/o 
ins. 
Royston. 
49-0 
40-8 
57-2 
16*4 
3-5 
93*o 
83 
6*3 
22*21 
161 
Berkhamsted. 
48-0 
40-3 
55-8 
15-5 
7'5 
91-0 
82 
7-2 
25*60 
1 76 
St. Albans. 
48 ’3 
41 -i 
55'4 
147 
io*i 
91-0 
82 
67 
26*00 
181 
Bennington . 
48 ‘O 
407 
55'3 
14*6 
97 
90-9 
81 
7'3 
23*89 
182 
New Barnet .... 
48-2 
38-8 
57-6 
18*8 
I *0 
94'5 
83 
6*2 
23*64 
139 
County.. 
48-3 
40’4 
56*3 
159 
I *0 
94'5 
82 
67 
24*27 
168 
The next table gives the results for the seasons, the year being 
divided as usual. It will be seen that Autumn is warmer than 
Spring chiefly on account of the colder nights in Spring, and that 
although the range of temperature is very much greater in the 
warmest season than it is in the coldest, it is greater in Spring 
than it is in Autumn. The relative humidity follows the same 
rule, the warmest season having the driest atmosphere, but the air 
in Spring being much drier than it is in Autumn. While Winter 
and Spring have about the same rainfall, there are much fewer 
* The actual mean temperature here is 48°*0o. 
