
| Month | Low | High |
|---|---|---|
| Jan | 9.5°F | 26.1°F |
| Feb | 9.7°F | 28.2°F |
| Mar | 18.7°F | 37.3°F |
| Apr | 30.2°F | 50.3°F |
| May | 40.0°F | 64.3°F |
| Jun | 48.8°F | 73.8°F |
| Jul | 54.5°F | 79.0°F |
| Aug | 52.9°F | 76.1°F |
| Sept | 45.2°F | 67.4°F |
| Oct | 35.6°F | 55.6°F |
| Nov | 27.0°F | 42.2°F |
| Dec | 16.9°F | 31.2°F |
Alpena's coldest month is January when the average temperature overnight is 9.5°F. In July, the warmest month, the average day time temperature rises to 79.0°F.

| Month | Precipitation |
|---|---|
| Jan | 1.76in. |
| Feb | 1.35in. |
| Mar | 2.13in. |
| Apr | 2.31in. |
| May | 2.61in. |
| Jun | 2.53in. |
| Jul | 3.17in. |
| Aug | 3.50in. |
| Sept | 2.80in. |
| Oct | 2.33in. |
| Nov | 2.08in. |
| Dec | 1.83in. |
The driest month in Alpena is February with 1.35 inches of precipitation, and with 3.50 inches August is the wettest month.