Average annual temperature is 11.4 °C
Absolute maximum temperature: 39.4 °C
Absolute minimum temperature: -22.0 °C
Number of sunny days: 237 days
Number of rainy days: 106 days
Number of snow days: 22 days
Look at detailed online map of Rockville
* Weather data for Rockville 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) | 9.8 | 14.2 | 19.6 | 28.3 | 28.5 | 33.1 | 38.2 | 39.4 | 36.1 | 30.6 | 20.0 | 13.9 |
| Average daytime temperature (°C) | 0.1 | 5.1 | 8.9 | 18.4 | 24.8 | 28.5 | 30.3 | 31.7 | 28.0 | 18.1 | 12.2 | 5.8 |
| Average temperature (°C) | -4.3 | -1.9 | 1.6 | 10.7 | 18.5 | 22.3 | 24.0 | 25.1 | 21.4 | 12.1 | 5.8 | 0.8 |
| Average night temperature (°C) | -8.0 | -6.5 | -3.5 | 4.3 | 12.5 | 16.6 | 18.6 | 19.6 | 15.6 | 7.1 | 0.9 | -2.8 |
| Absolute minimum temperature (°C) | -22.0 | -19.3 | -10.4 | -5.6 | 1.9 | 9.9 | 12.5 | 13.0 | 9.2 | -7.7 | -6.4 | -8.3 |
| 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) | 5.3 | 8.1 | 8.7 | 10.8 | 11.0 | 11.9 | 11.9 | 11.5 | 10.5 | 7.8 | 7.1 | 4.5 |
| Precipitation (mm) | 54 | 31 | 26 | 9 | 58 | 115 | 111 | 33 | 43 | 42 | 15 | 39 |
| Sunny days | 22 | 17 | 25 | 25 | 13 | 14 | 16 | 21 | 23 | 17 | 23 | 21 |
| Rainy days | 4 | 5 | 4 | 4 | 18 | 16 | 15 | 10 | 7 | 12 | 5 | 6 |
| Snow days | 5 | 6 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 4 |
The best time to visit Rockville during the most sunny months:
The largest precipitation sum in Rockville is at