Average annual temperature is 13.0 °C
Absolute maximum temperature: 33.3 °C
Absolute minimum temperature: -9.3 °C
Number of sunny days: 165 days
Number of rainy days: 190 days
Number of snow days: 10 days
Look at detailed online map of McLean
* Weather data for McLean 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) | 16.9 | 21.9 | 22.9 | 27.1 | 29.7 | 32.6 | 33.3 | 33.3 | 33.2 | 29.1 | 22.8 | 16.6 |
| Average daytime temperature (°C) | 7.4 | 11.8 | 11.8 | 18.0 | 22.5 | 26.6 | 29.4 | 28.2 | 26.0 | 19.4 | 12.4 | 9.3 |
| Average temperature (°C) | 3.3 | 5.0 | 5.5 | 11.8 | 16.4 | 20.8 | 24.0 | 22.7 | 20.2 | 14.2 | 6.7 | 4.7 |
| Average night temperature (°C) | 0.0 | 0.3 | 0.8 | 6.3 | 10.8 | 15.3 | 19.4 | 17.8 | 14.9 | 9.9 | 2.6 | 1.4 |
| Absolute minimum temperature (°C) | -7.1 | -9.3 | -7.8 | -0.3 | 3.0 | 10.8 | 15.4 | 12.3 | 9.8 | -0.2 | -6.9 | -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 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.5 | 11.2 | 10.0 | 9.4 |
| 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) | 4.1 | 7.6 | 7.8 | 9.2 | 10.2 | 10.7 | 11.5 | 10.7 | 9.7 | 7.2 | 7.5 | 5.0 |
| Precipitation (mm) | 138 | 57 | 127 | 68 | 64 | 102 | 82 | 139 | 31 | 67 | 42 | 71 |
| Sunny days | 6 | 15 | 15 | 15 | 16 | 13 | 6 | 14 | 17 | 16 | 20 | 12 |
| Rainy days | 21 | 12 | 11 | 15 | 15 | 17 | 25 | 17 | 13 | 15 | 10 | 19 |
| Snow days | 4 | 1 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit McLean during the most sunny months:
The largest precipitation sum in McLean is at