S
M
T
W
T
F
S
29
37°
20°
30
33°
16°
1
30°
18°
2
31°
19°
3
32°
18°
4
31°
17°
5
32°
19°
6
32°
17°
7
31°
14°
8
29°
13°
9
26°
15°
10
25°
12°
11
25°
13°
12
29°
5°
13
24°
3°
14
15°
11°
15
20°
11°
16
25°
-4°
17
26°
-5°
18
22°
0°
19
11°
-6°
20
13°
-7°
21
8°
-3°
22
9°
5°
23
12°
10°
24
19°
11°
25
20°
10°
26
24°
11°
27
27°
10°
28
Hist. Avg.
16°
0°
29
Hist. Avg.
15°
0°
30
Hist. Avg.
15°
0°
31
Hist. Avg.
15°
-1°
1
Hist. Avg.
14°
-1°
2
Hist. Avg.
14°
-1°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Thief River Falls
Thief River Falls's December 2026 forecast shows daily high temperatures ranging from 8° to 37°, with overnight lows between -7° and 20°. The average high for December is 24° with an average low of 9°. 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 Thief River Falls. See also: January | February | March.
