Average data for 10 years
1 December
Sunday
+5°
+2°
2 December
Monday
+5°
+2°
3 December
Tuesday
+4°
+2°
4 December
Wednesday
+5°
+2°
5 December
Thursday
+4°
0°
6 December
Friday
+2°
−2°
7 December
Saturday
+1°
−2°
8 December
Sunday
+3°
−1°
9 December
Monday
+4°
+1°
10 December
Tuesday
+3°
0°
11 December
Wednesday
+2°
−1°
12 December
Thursday
+1°
−1°
13 December
Friday
+2°
0°
14 December
Saturday
+2°
−2°
15 December
Sunday
+1°
−1°
16 December
Monday
−1°
−3°
17 December
Tuesday
0°
−2°
18 December
Wednesday
+1°
−2°
19 December
Thursday
+1°
−2°
20 December
Friday
+2°
0°
21 December
Saturday
+2°
0°
22 December
Sunday
+2°
−1°
23 December
Monday
+1°
−2°
24 December
Tuesday
−1°
−3°
25 December
Wednesday
−1°
−3°
26 December
Thursday
−2°
−5°
27 December
Friday
−1°
−4°
28 December
Saturday
−1°
−4°
29 December
Sunday
+1°
−2°
30 December
Monday
0°
−3°
31 December
Tuesday
0°
−3°
In December, the weather in Nagano is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Nagano has 19 rainy, 9 snowy, and 3 sunny days in December. The rains are usually heavy. December as well as March, April, June, and July is considered the most uncomfortable time to visit Nagano.