Average annual temperature is 10.9 °C
Absolute maximum temperature: 38.8 °C
Absolute minimum temperature: -21.2 °C
Number of sunny days: 229 days
Number of rainy days: 116 days
Number of snow days: 20 days
Look at detailed online map of Mason City
* Weather data for Mason City 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) | 6.0 | 13.2 | 18.8 | 27.9 | 28.3 | 32.4 | 37.3 | 38.8 | 36.1 | 29.5 | 18.5 | 13.9 |
| Average daytime temperature (°C) | -1.2 | 4.3 | 8.4 | 17.4 | 23.7 | 27.7 | 30.1 | 31.3 | 27.2 | 17.3 | 11.5 | 5.8 |
| Average temperature (°C) | -4.7 | -2.4 | 1.0 | 10.0 | 17.6 | 21.7 | 23.8 | 24.9 | 20.8 | 11.4 | 5.4 | 0.8 |
| Average night temperature (°C) | -7.8 | -6.8 | -3.8 | 3.7 | 11.7 | 16.2 | 18.5 | 19.4 | 15.2 | 6.6 | 0.9 | -2.8 |
| Absolute minimum temperature (°C) | -21.2 | -20.4 | -10.8 | -5.7 | 1.4 | 9.5 | 11.8 | 13.7 | 9.7 | -8.7 | -7.2 | -8.4 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 5.4 | 8.0 | 9.0 | 10.9 | 11.0 | 12.0 | 12.2 | 11.6 | 10.5 | 7.8 | 7.1 | 4.8 |
| Precipitation (mm) | 60 | 21 | 25 | 7 | 66 | 113 | 126 | 27 | 52 | 104 | 21 | 35 |
| Sunny days | 18 | 18 | 23 | 23 | 11 | 15 | 15 | 21 | 21 | 20 | 23 | 21 |
| Rainy days | 6 | 4 | 6 | 6 | 20 | 15 | 16 | 10 | 9 | 9 | 6 | 9 |
| Snow days | 7 | 6 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 1 |
The best time to visit Mason City during the most sunny months:
The largest precipitation sum in Mason City is at