Average annual temperature is 10.4 °C
Absolute maximum temperature: 38.2 °C
Absolute minimum temperature: -25.4 °C
Number of sunny days: 191 days
Number of rainy days: 142 days
Number of snow days: 32 days
Look at detailed online map of Decorah
* Weather data for Decorah United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 6.4 | 8.7 | 16.8 | 25.9 | 31.6 | 32.6 | 34.0 | 38.2 | 34.1 | 29.8 | 17.4 | 12.1 |
| Average daytime temperature (°C) | -0.6 | 2.5 | 6.1 | 15.0 | 23.6 | 28.3 | 28.5 | 28.4 | 25.2 | 16.0 | 8.8 | 5.5 |
| Average temperature (°C) | -4.4 | -3.0 | 1.0 | 8.7 | 17.0 | 22.4 | 22.8 | 23.0 | 19.7 | 11.7 | 4.0 | 1.5 |
| Average night temperature (°C) | -7.6 | -7.3 | -3.0 | 3.8 | 11.0 | 16.7 | 17.5 | 18.3 | 15.3 | 8.1 | 0.4 | -1.1 |
| Absolute minimum temperature (°C) | -25.4 | -24.8 | -13.6 | -6.5 | 1.7 | 9.0 | 11.7 | 12.7 | 8.3 | -5.0 | -13.1 | -7.5 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.4 | 10.5 | 11.9 | 13.4 | 14.7 | 15.3 | 15.0 | 13.9 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 4.0 | 6.9 | 6.8 | 8.8 | 11.8 | 12.3 | 12.2 | 11.5 | 9.6 | 7.0 | 7.1 | 4.2 |
| Precipitation (mm) | 48 | 42 | 67 | 81 | 56 | 36 | 83 | 38 | 87 | 98 | 7 | 30 |
| Sunny days | 17 | 15 | 13 | 16 | 21 | 16 | 12 | 12 | 14 | 15 | 23 | 17 |
| Rainy days | 5 | 8 | 10 | 14 | 10 | 14 | 19 | 19 | 16 | 13 | 6 | 8 |
| Snow days | 9 | 5 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 1 | 6 |
The best time to visit Decorah during the most sunny months:
Months with the longest average daylight duration in Decorah:
The largest precipitation sum in Decorah is at