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The tables below display average monthly climate and weather indicators in Boise Idaho.
Temperature by: Fahrenheit / Centigrade
| Boise Temperature |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Avg. Temperature |
-1.7 |
2.2 |
5.8 |
9.5 |
14.2 |
19.2 |
23.3 |
22.5 |
17.0 |
11.0 |
4.4 |
-1.1 |
10.5 |
| Avg. Max Temperature |
2.4 |
6.8 |
11.6 |
16.3 |
21.7 |
27.2 |
32.3 |
31.2 |
25.0 |
18.1 |
9.3 |
3.2 |
17.1 |
| Avg. Min Temperature |
-5.8 |
-2.5 |
-0.1 |
2.6 |
6.6 |
11.2 |
14.3 |
13.8 |
9.0 |
3.9 |
-0.5 |
-5.3 |
3.9 |
| Days with Max Temp of 32 C or Higher |
0.0 |
0.0 |
0.0 |
< 0.5 |
1.0 |
5.0 |
19.0 |
16.0 |
3.0 |
< 0.5 |
0.0 |
0.0 |
44.0 |
| Days with Min Temp Below Freezing |
26.0 |
21.0 |
17.0 |
8.0 |
2.0 |
< 0.5 |
0.0 |
0.0 |
0.0 |
6.0 |
18.0 |
25.0 |
123 |
| | |
| Boise Heating and Cooling |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Heating Degree Days |
1116 |
815 |
701 |
477 |
242 |
75.0 |
6.0 |
20.0 |
160 |
414 |
753 |
1082 |
5861 |
| Cooling Degree Days |
0.0 |
0.0 |
0.0 |
0.0 |
9.0 |
120 |
285 |
252 |
88.0 |
0.0 |
0.0 |
0.0 |
754 |
| | |
| Boise Precipitation |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Precipitation (inches) |
1.4 |
1.1 |
1.3 |
1.2 |
1.1 |
0.8 |
0.3 |
0.4 |
0.8 |
0.8 |
1.5 |
1.4 |
12.1 |
| Days with Precipitation 0.01 inch or More |
12.0 |
10.0 |
10.0 |
8.0 |
8.0 |
6.0 |
3.0 |
2.0 |
4.0 |
6.0 |
10.0 |
11.0 |
90.0 |
| Monthly Snowfall (inches) |
6.5 |
3.7 |
1.6 |
0.6 |
0.1 |
< 0.05 |
< 0.05 |
< 0.05 |
< 0.05 |
0.1 |
2.3 |
5.9 |
20.8 |
| | |
| Other Boise Weather Indicators |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Average Wind Speed |
8.0 |
8.9 |
9.9 |
9.9 |
9.4 |
9.0 |
8.4 |
8.2 |
8.2 |
8.3 |
8.4 |
8.1 |
8.7 |
| Clear Days |
4.0 |
5.0 |
6.0 |
6.0 |
8.0 |
12.0 |
20.0 |
19.0 |
17.0 |
12.0 |
6.0 |
5.0 |
120 |
| Partly Cloudy Days |
5.0 |
6.0 |
7.0 |
9.0 |
10.0 |
10.0 |
7.0 |
8.0 |
7.0 |
8.0 |
6.0 |
6.0 |
90.0 |
| Cloudy Days |
22.0 |
17.0 |
18.0 |
15.0 |
13.0 |
8.0 |
3.0 |
4.0 |
6.0 |
11.0 |
18.0 |
20.0 |
155 |
| Percent of Possible Sunshine |
40.0 |
51.0 |
62.0 |
68.0 |
70.0 |
75.0 |
87.0 |
85.0 |
82.0 |
69.0 |
43.0 |
38.0 |
64.0 |
| Avg. Relative Humidity |
69.5 |
74.5 |
66.5 |
57.0 |
52.5 |
50.0 |
42.0 |
37.0 |
40.5 |
47.5 |
58.0 |
70.5 |
70.0 |
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