Average annual temperature is 11.0 °C
Absolute maximum temperature: 34.0 °C
Absolute minimum temperature: -5.5 °C
Number of sunny days: 168 days
Number of rainy days: 195 days
Number of snow days: 2 days
Look at detailed online map of Joint Base Lewis McChord
* Weather data for Joint Base Lewis McChord 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) | 14.6 | 11.8 | 16.5 | 23.1 | 30.3 | 29.7 | 31.6 | 34.0 | 28.5 | 24.3 | 15.2 | 14.2 |
| Average daytime temperature (°C) | 8.6 | 8.0 | 10.5 | 12.5 | 21.6 | 22.9 | 27.2 | 27.7 | 21.7 | 16.2 | 10.2 | 9.4 |
| Average temperature (°C) | 5.2 | 3.8 | 5.2 | 7.7 | 14.7 | 15.7 | 19.3 | 20.4 | 15.4 | 11.1 | 6.5 | 6.5 |
| Average night temperature (°C) | 2.6 | 1.2 | 1.6 | 4.2 | 9.6 | 10.2 | 12.9 | 14.8 | 11.3 | 7.8 | 3.9 | 4.2 |
| Absolute minimum temperature (°C) | -5.2 | -5.5 | -3.2 | -0.7 | 6.6 | 6.7 | 10.3 | 10.8 | 8.2 | -2.0 | -1.9 | 0.0 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 |
| Daylight mean duration (h) | 9.0 | 10.3 | 11.9 | 13.6 | 15.1 | 15.8 | 15.5 | 14.2 | 12.6 | 10.9 | 9.4 | 8.6 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 4.0 | 5.3 | 7.3 | 6.7 | 11.0 | 11.9 | 13.1 | 11.6 | 8.4 | 6.4 | 4.9 | 3.1 |
| Precipitation (mm) | 91 | 69 | 89 | 151 | 19 | 27 | 6 | 36 | 88 | 84 | 158 | 222 |
| Sunny days | 6 | 9 | 7 | 6 | 21 | 21 | 26 | 19 | 14 | 16 | 15 | 8 |
| Rainy days | 24 | 18 | 24 | 24 | 10 | 9 | 5 | 12 | 16 | 15 | 15 | 23 |
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Joint Base Lewis McChord during the most sunny months:
Months with the longest average daylight duration in Joint Base Lewis McChord:
The largest precipitation sum in Joint Base Lewis McChord is at