Average annual temperature is 11.0 °C
Absolute maximum temperature: 33.3 °C
Absolute minimum temperature: -14.0 °C
Number of sunny days: 148 days
Number of rainy days: 200 days
Number of snow days: 17 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) | 15.1 | 17.9 | 16.9 | 28.6 | 30.2 | 32.0 | 33.3 | 30.5 | 31.0 | 26.5 | 17.1 | 13.1 |
| Average daytime temperature (°C) | 5.3 | 7.8 | 7.9 | 17.3 | 20.5 | 24.3 | 28.4 | 26.1 | 22.4 | 16.8 | 8.9 | 6.4 |
| Average temperature (°C) | 2.2 | 1.9 | 2.6 | 11.0 | 14.2 | 18.5 | 22.9 | 20.8 | 17.6 | 12.5 | 4.5 | 3.2 |
| Average night temperature (°C) | -0.1 | -2.4 | -1.3 | 5.6 | 8.0 | 13.4 | 18.2 | 16.4 | 13.7 | 9.0 | 0.8 | 0.7 |
| Absolute minimum temperature (°C) | -5.6 | -14.0 | -8.2 | -2.9 | 1.8 | 8.0 | 14.8 | 12.2 | 8.8 | 0.2 | -7.5 | -4.9 |
| 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) | 3.8 | 6.6 | 6.7 | 8.8 | 11.3 | 11.3 | 11.8 | 10.9 | 8.7 | 7.1 | 7.3 | 3.9 |
| Precipitation (mm) | 94 | 54 | 82 | 85 | 26 | 118 | 98 | 145 | 83 | 79 | 54 | 113 |
| Sunny days | 6 | 12 | 9 | 14 | 20 | 10 | 7 | 7 | 16 | 15 | 19 | 13 |
| Rainy days | 18 | 15 | 19 | 16 | 11 | 20 | 24 | 24 | 14 | 16 | 9 | 14 |
| Snow days | 7 | 1 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 |
The best time to visit Rockville during the most sunny months:
The largest precipitation sum in Rockville is at