Average annual temperature is 12.7 °C
Absolute maximum temperature: 35.7 °C
Absolute minimum temperature: -14.5 °C
Number of sunny days: 192 days
Number of rainy days: 160 days
Number of snow days: 13 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) | 17.9 | 14.6 | 21.4 | 27.0 | 31.2 | 33.5 | 34.8 | 35.7 | 31.5 | 28.7 | 23.9 | 16.0 |
| Average daytime temperature (°C) | 5.5 | 8.3 | 10.3 | 18.6 | 25.3 | 29.4 | 29.0 | 27.8 | 25.4 | 18.4 | 11.7 | 8.1 |
| Average temperature (°C) | 0.9 | 2.3 | 4.5 | 11.5 | 18.8 | 23.1 | 23.8 | 22.8 | 20.1 | 13.6 | 6.2 | 4.1 |
| Average night temperature (°C) | -2.2 | -1.8 | 0.1 | 5.8 | 12.8 | 16.9 | 18.9 | 18.5 | 15.7 | 9.6 | 1.7 | 1.3 |
| Absolute minimum temperature (°C) | -14.3 | -14.5 | -10.8 | -2.1 | 2.8 | 10.6 | 14.3 | 11.5 | 9.9 | -2.4 | -9.9 | -8.0 |
| 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 | 9.4 |
| 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) | 3.9 | 7.3 | 6.5 | 9.7 | 10.9 | 12.7 | 12.5 | 10.5 | 10.0 | 7.5 | 7.5 | 4.6 |
| Precipitation (mm) | 51 | 108 | 136 | 77 | 23 | 21 | 89 | 189 | 55 | 84 | 23 | 65 |
| Sunny days | 9 | 16 | 12 | 16 | 17 | 24 | 13 | 13 | 17 | 17 | 22 | 16 |
| Rainy days | 12 | 11 | 18 | 14 | 14 | 6 | 18 | 18 | 13 | 14 | 8 | 14 |
| Snow days | 10 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit McLean during the most sunny months:
The largest precipitation sum in McLean is at