Average annual temperature is 10.1 °C
Absolute maximum temperature: 35.3 °C
Absolute minimum temperature: -20.4 °C
Number of sunny days: 162 days
Number of rainy days: 177 days
Number of snow days: 26 days
Look at detailed online map of Grattan
* Weather data for Grattan 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) | 7.4 | 12.3 | 15.7 | 26.7 | 33.6 | 35.3 | 32.6 | 31.6 | 31.4 | 28.4 | 16.0 | 13.6 |
| Average daytime temperature (°C) | 2.2 | 3.3 | 6.4 | 15.0 | 22.4 | 27.4 | 27.5 | 25.7 | 22.9 | 15.5 | 8.1 | 5.9 |
| Average temperature (°C) | -0.8 | -1.6 | 1.4 | 8.6 | 15.1 | 20.5 | 21.9 | 20.0 | 17.8 | 11.2 | 3.6 | 2.9 |
| Average night temperature (°C) | -3.2 | -6.0 | -2.7 | 3.4 | 8.6 | 14.4 | 16.8 | 15.5 | 13.5 | 7.8 | 0.1 | 0.7 |
| Absolute minimum temperature (°C) | -20.4 | -19.5 | -11.2 | -4.4 | 1.4 | 8.9 | 13.0 | 9.4 | 7.2 | -0.3 | -8.2 | -5.3 |
| 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 | 9.1 |
| 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) | 2.8 | 6.2 | 6.5 | 9.0 | 10.5 | 11.6 | 12.0 | 10.3 | 8.1 | 5.5 | 5.8 | 3.3 |
| Precipitation (mm) | 65 | 99 | 100 | 84 | 33 | 56 | 142 | 121 | 35 | 114 | 69 | 53 |
| Sunny days | 9 | 12 | 12 | 12 | 20 | 19 | 10 | 15 | 15 | 7 | 17 | 14 |
| Rainy days | 12 | 11 | 15 | 17 | 11 | 11 | 21 | 16 | 15 | 23 | 9 | 16 |
| Snow days | 10 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 1 |
The best time to visit Grattan during the most sunny months:
Months with the longest average daylight duration in Grattan:
The largest precipitation sum in Grattan is at