Average annual temperature is 16.0 °C
Absolute maximum temperature: 40.6 °C
Absolute minimum temperature: -13.0 °C
Number of sunny days: 251 days
Number of rainy days: 109 days
Number of snow days: 5 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) | 23.3 | 24.6 | 26.7 | 30.0 | 31.9 | 37.8 | 38.0 | 40.6 | 39.1 | 30.1 | 29.7 | 23.5 |
| Average daytime temperature (°C) | 11.8 | 14.3 | 16.8 | 22.2 | 25.0 | 29.1 | 33.7 | 35.5 | 30.6 | 23.4 | 16.7 | 12.5 |
| Average temperature (°C) | 5.0 | 6.1 | 9.2 | 14.3 | 19.0 | 23.0 | 27.3 | 28.9 | 24.6 | 16.8 | 10.3 | 6.4 |
| Average night temperature (°C) | 0.5 | 0.6 | 3.4 | 8.2 | 14.2 | 17.9 | 21.6 | 22.5 | 19.0 | 11.4 | 5.6 | 2.1 |
| Absolute minimum temperature (°C) | -13.0 | -8.3 | -5.9 | -1.5 | 8.4 | 13.4 | 17.0 | 17.0 | 14.3 | -3.1 | -4.0 | -4.6 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.8 | 8.3 | 9.9 | 10.3 | 10.5 | 11.7 | 12.3 | 12.2 | 10.3 | 9.3 | 8.1 | 7.6 |
| Precipitation (mm) | 15 | 20 | 4 | 28 | 89 | 93 | 51 | 9 | 61 | 32 | 15 | 60 |
| Sunny days | 26 | 21 | 26 | 24 | 13 | 10 | 16 | 25 | 22 | 20 | 23 | 25 |
| Rainy days | 3 | 7 | 3 | 6 | 18 | 20 | 15 | 6 | 8 | 11 | 6 | 6 |
| Snow days | 2 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
The largest precipitation sum in McLean is at