Average data for 10 years
1 December
Monday
+1°
−1°
2 December
Tuesday
0°
−1°
3 December
Wednesday
+1°
−1°
4 December
Thursday
+1°
−1°
5 December
Friday
0°
−1°
6 December
Saturday
+1°
−1°
7 December
Sunday
0°
−1°
8 December
Monday
+1°
−1°
9 December
Tuesday
−1°
0°
10 December
Wednesday
−1°
−3°
11 December
Thursday
−1°
−3°
12 December
Friday
−1°
−3°
13 December
Saturday
−2°
−3°
14 December
Sunday
−3°
−4°
15 December
Monday
−4°
−5°
16 December
Tuesday
−4°
−5°
17 December
Wednesday
−3°
−5°
18 December
Thursday
−3°
−5°
19 December
Friday
−2°
−4°
20 December
Saturday
−2°
−2°
21 December
Sunday
−2°
−4°
22 December
Monday
−1°
−2°
23 December
Tuesday
0°
−1°
24 December
Wednesday
−1°
−2°
25 December
Thursday
0°
−2°
26 December
Friday
0°
−1°
27 December
Saturday
−1°
−1°
28 December
Sunday
−2°
−2°
29 December
Monday
−3°
−4°
30 December
Tuesday
−3°
−5°
31 December
Wednesday
−3°
−5°
December in Sumy is the windiest month of the year. In December, the weather in Sumy is typically freezing. Average daily high temperature in December is about 1 degree below zero. On average, Sumy has 14 snowy, 14 cloudy, 2 rainy, and 1 sunny day in December. The snowfalls are usually moderate.