GROUND WATER IN NORTH-CENTRAL TENNESSEE

GEOGRAPHY /
The annual range between average monthly mean maximum and
average monthly mean minim am temperature is about 40° F., from
37°-41° in January to 76°-79° in July at the several climatologic
stations. The absolute range in temperature is much greater, how­
ever, the highest recorded temperature being 112° for the month of
September at Clarksville and the lowest being 23° below zero during
February at Johnsonville. For north-central Tennessee as a whole,
therefore, the absolute recorded range of temperature is 135°, although
it does not exceed 131° for any one climatologic station and is rarely
more than 100° during any one year. At Nashville, for example,
temperatures of 100° or higher have been registerd only for 13 out of
57 years, and temperatures of 0° or lower are similarly infrequent.
It is noteworthy that although the average monthly mean minimum
temperature occurs in January and the mean maximum during July,
the absolute minimum and maximum have been recorded during
February and September, respectively, at all stations. The published
temperature data are summarized in the following tables, and the
essential features of local and seasonal variations of temperature are
also shown by Figure 2.
&
*,«
§£
r 32
12
3
2
41
13
26
16
1
20
19
31
15
11
34
33
29
8
35
30
17
37
44
36
38
Average mean monthly and annual temperature at 25 stations in central
o