S
M
T
W
T
F
S
29
46°
38°
30
47°
40°
1
50°
41°
2
50°
40°
3
49°
39°
4
49°
39°
5
47°
38°
6
48°
37°
7
46°
39°
8
45°
38°
9
48°
37°
10
47°
38°
11
46°
37°
12
45°
34°
13
43°
34°
14
42°
36°
15
44°
41°
16
50°
40°
17
50°
40°
18
49°
38°
19
49°
35°
20
48°
33°
21
42°
37°
22
43°
38°
23
44°
38°
24
43°
37°
25
44°
34°
26
45°
32°
27
42°
36°
28
41°
38°
29
47°
37°
30
46°
37°
31
47°
35°
1
44°
34°
2
41°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Sleaford
Sleaford's December 2026 forecast shows daily high temperatures ranging from 41° to 50°, with overnight lows between 31° and 41°. The average high for December is 46° with an average low of 37°. 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 Sleaford. See also: January | February | March.
