Average annual temperature is 13.7 °C
Absolute maximum temperature: 36.9 °C
Absolute minimum temperature: -9.4 °C
Number of sunny days: 214 days
Number of rainy days: 148 days
Number of snow days: 3 days
Look at detailed online map of Grottoes
* Weather data for Grottoes 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) | 18.8 | 24.3 | 25.3 | 30.1 | 28.3 | 31.3 | 36.9 | 36.4 | 36.0 | 28.2 | 26.0 | 19.7 |
| Average daytime temperature (°C) | 10.1 | 13.1 | 14.1 | 21.9 | 22.6 | 26.5 | 32.4 | 31.0 | 26.9 | 21.2 | 13.9 | 10.9 |
| Average temperature (°C) | 4.9 | 6.9 | 7.1 | 13.8 | 15.9 | 19.7 | 25.1 | 23.8 | 20.1 | 14.3 | 6.9 | 4.9 |
| Average night temperature (°C) | 1.3 | 1.9 | 1.8 | 7.2 | 10.1 | 13.6 | 18.6 | 18.0 | 14.4 | 8.8 | 1.7 | 0.9 |
| Absolute minimum temperature (°C) | -5.1 | -9.4 | -5.7 | -1.4 | 3.1 | 9.4 | 15.3 | 12.2 | 9.8 | 0.6 | -6.5 | -5.2 |
| 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) | 5.7 | 7.0 | 7.9 | 9.9 | 10.4 | 10.7 | 12.5 | 11.1 | 9.5 | 9.0 | 8.1 | 6.2 |
| Precipitation (mm) | 44 | 72 | 50 | 96 | 38 | 108 | 49 | 20 | 48 | 18 | 51 | 106 |
| Sunny days | 13 | 17 | 19 | 21 | 14 | 15 | 13 | 18 | 18 | 23 | 25 | 18 |
| Rainy days | 17 | 11 | 11 | 9 | 17 | 15 | 18 | 13 | 12 | 8 | 5 | 12 |
| Snow days | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Grottoes during the most sunny months:
The largest precipitation sum in Grottoes is at