Average annual temperature is 14.6 °C
Absolute maximum temperature: 37.3 °C
Absolute minimum temperature: -11.4 °C
Number of sunny days: 225 days
Number of rainy days: 133 days
Number of snow days: 7 days
Look at detailed online map of Ottumwa
* Weather data for Ottumwa 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) | 14.5 | 18.4 | 24.3 | 27.6 | 32.1 | 37.2 | 35.8 | 37.3 | 34.7 | 31.4 | 22.7 | 15.6 |
| Average daytime temperature (°C) | 7.5 | 10.0 | 12.6 | 20.8 | 25.7 | 30.3 | 32.3 | 32.3 | 29.1 | 21.0 | 12.9 | 9.5 |
| Average temperature (°C) | 2.0 | 3.3 | 6.7 | 13.8 | 19.9 | 24.6 | 26.5 | 26.6 | 23.0 | 15.6 | 7.7 | 4.9 |
| Average night temperature (°C) | -1.5 | -1.8 | 2.1 | 8.3 | 14.8 | 19.5 | 21.8 | 22.1 | 18.0 | 11.1 | 3.3 | 1.6 |
| Absolute minimum temperature (°C) | -11.4 | -10.4 | -6.5 | 0.2 | 6.3 | 13.8 | 17.2 | 16.7 | 13.8 | -2.7 | -7.0 | -3.5 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.4 | 8.0 | 7.8 | 10.5 | 10.4 | 12.7 | 11.4 | 12.0 | 10.5 | 7.7 | 7.3 | 5.1 |
| Precipitation (mm) | 45 | 56 | 47 | 51 | 47 | 49 | 62 | 45 | 76 | 98 | 44 | 85 |
| Sunny days | 21 | 17 | 17 | 21 | 15 | 14 | 15 | 25 | 21 | 19 | 22 | 18 |
| Rainy days | 9 | 10 | 14 | 9 | 16 | 16 | 16 | 6 | 9 | 12 | 6 | 10 |
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 |
The best time to visit Ottumwa during the most sunny months:
The largest precipitation sum in Ottumwa is at