Average annual temperature is 12.6 °C
Absolute maximum temperature: 35.2 °C
Absolute minimum temperature: -13.9 °C
Number of sunny days: 182 days
Number of rainy days: 179 days
Number of snow days: 4 days
Look at detailed online map of Harrow
* Weather data for Harrow 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) | 18.7 | 17.9 | 17.2 | 30.3 | 29.1 | 35.2 | 33.8 | 30.7 | 34.0 | 27.6 | 19.9 | 15.9 |
| Average daytime temperature (°C) | 8.2 | 8.9 | 10.5 | 18.9 | 22.5 | 26.3 | 29.9 | 27.6 | 24.1 | 19.3 | 10.9 | 8.6 |
| Average temperature (°C) | 4.4 | 3.5 | 4.8 | 12.5 | 15.5 | 20.0 | 24.1 | 22.4 | 19.1 | 14.1 | 5.9 | 4.6 |
| Average night temperature (°C) | 1.1 | -0.8 | 0.1 | 7.4 | 8.9 | 14.6 | 19.6 | 18.0 | 15.1 | 9.9 | 1.8 | 1.2 |
| Absolute minimum temperature (°C) | -4.7 | -13.9 | -5.3 | -0.9 | 3.7 | 9.6 | 15.6 | 13.5 | 9.6 | 4.0 | -5.0 | -4.7 |
| 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) | 9.7 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 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) | 4.3 | 7.0 | 7.5 | 8.7 | 11.5 | 10.7 | 11.6 | 10.1 | 8.0 | 8.0 | 7.5 | 4.8 |
| Precipitation (mm) | 109 | 40 | 80 | 116 | 50 | 115 | 150 | 107 | 216 | 50 | 76 | 183 |
| Sunny days | 12 | 17 | 12 | 14 | 20 | 15 | 10 | 14 | 13 | 21 | 18 | 16 |
| Rainy days | 19 | 9 | 18 | 16 | 11 | 15 | 21 | 17 | 17 | 10 | 11 | 15 |
| Snow days | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
The best time to visit Harrow during the most sunny months:
The largest precipitation sum in Harrow is at