S
M
T
W
T
F
S
29
39°
22°
30
39°
27°
1
40°
27°
2
41°
26°
3
41°
27°
4
42°
25°
5
42°
25°
6
40°
26°
7
38°
21°
8
39°
27°
9
42°
31°
10
44°
29°
11
50°
24°
12
51°
23°
13
Hist. Avg.
39°
21°
14
Hist. Avg.
38°
21°
15
Hist. Avg.
38°
20°
16
Hist. Avg.
38°
20°
17
Hist. Avg.
37°
20°
18
Hist. Avg.
37°
20°
19
Hist. Avg.
37°
20°
20
Hist. Avg.
37°
19°
21
Hist. Avg.
36°
19°
22
Hist. Avg.
36°
19°
23
Hist. Avg.
36°
19°
24
Hist. Avg.
36°
18°
25
Hist. Avg.
36°
18°
26
Hist. Avg.
35°
18°
27
Hist. Avg.
35°
18°
28
Hist. Avg.
35°
18°
29
Hist. Avg.
35°
18°
30
Hist. Avg.
35°
18°
31
Hist. Avg.
35°
17°
1
Hist. Avg.
35°
17°
2
Hist. Avg.
35°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Greencastle
Greencastle's December 2026 forecast shows daily high temperatures ranging from 38° to 51°, with overnight lows between 21° and 31°. The average high for December is 42° with an average low of 26°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Greencastle. See also: January | February | March.
