Average annual temperature is 11.8 °C
Absolute maximum temperature: 34.3 °C
Absolute minimum temperature: -10.8 °C
Number of sunny days: 161 days
Number of rainy days: 190 days
Number of snow days: 14 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 | 20.7 | 19.3 | 26.8 | 30.3 | 32.8 | 34.3 | 31.7 | 33.0 | 27.6 | 18.4 | 15.3 |
| Average daytime temperature (°C) | 6.4 | 10.3 | 9.5 | 17.6 | 21.8 | 25.8 | 29.2 | 27.2 | 24.5 | 17.7 | 10.6 | 8.3 |
| Average temperature (°C) | 2.3 | 3.3 | 3.9 | 10.8 | 15.1 | 19.5 | 23.0 | 21.3 | 18.8 | 12.8 | 5.4 | 4.3 |
| Average night temperature (°C) | -0.8 | -1.6 | -0.4 | 5.1 | 9.1 | 14.0 | 17.8 | 16.4 | 14.0 | 8.8 | 1.6 | 1.5 |
| Absolute minimum temperature (°C) | -7.0 | -10.8 | -8.7 | -2.3 | 2.0 | 9.1 | 14.2 | 11.6 | 8.0 | -0.5 | -7.4 | -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 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 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) | 2.9 | 6.5 | 6.6 | 8.8 | 10.8 | 11.1 | 11.9 | 11.1 | 8.7 | 6.6 | 6.8 | 4.1 |
| Precipitation (mm) | 148 | 46 | 108 | 117 | 61 | 102 | 137 | 114 | 40 | 76 | 51 | 59 |
| Sunny days | 7 | 14 | 11 | 14 | 20 | 13 | 6 | 10 | 17 | 16 | 20 | 13 |
| Rainy days | 18 | 14 | 14 | 16 | 11 | 17 | 25 | 21 | 13 | 15 | 9 | 17 |
| Snow days | 6 | 0 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Rockville during the most sunny months:
The largest precipitation sum in Rockville is at