Average annual temperature is 14.8 °C
Absolute maximum temperature: 38.6 °C
Absolute minimum temperature: -0.5 °C
Number of sunny days: 260 days
Number of rainy days: 105 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) | 19.7 | 20.9 | 18.8 | 31.0 | 30.0 | 34.6 | 38.6 | 37.8 | 31.8 | 35.1 | 25.9 | 19.6 |
| Average daytime temperature (°C) | 14.1 | 14.1 | 14.1 | 20.7 | 21.9 | 25.0 | 32.2 | 32.2 | 27.2 | 26.5 | 19.2 | 15.6 |
| Average temperature (°C) | 9.3 | 8.3 | 9.0 | 13.2 | 14.9 | 17.2 | 21.4 | 22.1 | 19.0 | 18.5 | 13.5 | 10.8 |
| Average night temperature (°C) | 6.2 | 4.0 | 5.3 | 7.4 | 10.0 | 11.6 | 13.6 | 15.3 | 13.5 | 12.8 | 8.9 | 7.3 |
| Absolute minimum temperature (°C) | 1.7 | 1.0 | -0.5 | 2.0 | 5.6 | 9.7 | 10.3 | 11.8 | 10.8 | 6.3 | 3.1 | 1.9 |
| 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 | 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) | 5.6 | 7.8 | 7.7 | 11.3 | 11.7 | 13.0 | 13.2 | 12.1 | 11.0 | 9.5 | 8.0 | 5.9 |
| Precipitation (mm) | 361 | 90 | 286 | 8 | 19 | 1 | 0 | 1 | 6 | 14 | 70 | 148 |
| Sunny days | 11 | 15 | 9 | 26 | 23 | 28 | 30 | 30 | 26 | 25 | 21 | 16 |
| Rainy days | 20 | 13 | 22 | 4 | 8 | 2 | 1 | 1 | 4 | 6 | 9 | 15 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Rockville during the most sunny months:
The largest precipitation sum in Rockville is at