eR EEL 
219 
The Range of Temperature in Bath, considered in connection 
with the two last Tables (iv. and v.), presents the following 
features :— 
First ; the mean monthly range, or the mean difference between 
the absolute highest temperature and the absolute lowest tem- 
perature in each month, is least in February; the months 
of November, December, January, and March, showing no 
very marked difference among themselves in this respect, 
but the range in all greater than that of February—by 
three degrees or more. A considerable rise of the range 
occurs in April and May, in which months, scarcely different 
in this respect from each other, the mean monthly range 
attains its maximum. There is very little difference also in the 
three summer months of June, July, and August,—in none of 
which the range is much less than that of April and May. In the 
two autumnal months of September and October, the range is seen 
to decline further from the maximum, and in November the decline 
is still more marked, the range in this and in the other winter 
months being spoken of above. 
Secondly ; the mean daily range, or the mean difference between 
the highest temperature and the lowest temperature, in each 
twenty-four hours, rises gradually from a minimum in January to 
a maximum in July, then recedes, during the rest of the year, by 
steps nearly as gradual, till it reaches the minimum again. The 
chief circumstance noticeable is—that the greatest rise occurs in 
April ; the daily range of temperature in which month is 3°4 in 
excess of that of March. This rise is followed by a less one in 
May ; the range during that month, and the three following 
summer months, being nearly the same. 
It is, however, the mean daily range of temperature, and not the 
mean monthly range, that is of most consequence in considering 
the conditions of a climate. It is quite natural, however, that 
both these ranges should be greatest in the warmer months 
and lowest in the winter, as we see them to be in Tables iv. and vy. 
