
Umatilla National Forest
- Annual mean
- 7.4 °C
- Warmest month
- July
- Wettest month
- December
Analyzing twelve month atmospheric patterns and long term climate data for the Franklin County wilderness
The climate profile for Juniper Dunes Wilderness provides a detailed look at atmospheric trends through monthly averages recorded between 1991 and 2020. Data points for mean temperature, precipitation rates, relative humidity, wind speed, and daylight hours are derived from a representative coordinate at 326.83 meters elevation. These values illustrate long term climatological patterns for the area rather than current daily weather forecasts or absolute conditions across the entire protected landscape.

Long term monthly averages for temperature range and daily precipitation rates across twelve months
Track average temperatures, precipitation rates, humidity, wind, and calculated daylight across the year
| Mean temperature | Precipitation | Humidity | Wind speed | Daylight | |
|---|---|---|---|---|---|
| January | 1 °C-9.4° to 12.3° | 1.4 mm/day | 82.4% | 3.5 m/s | 8.9 hours |
| February | 3.2 °C-7.2° to 14.7° | 1.1 mm/day | 73.9% | 3.6 m/s | 10.1 hours |
| March | 7.1 °C-3.6° to 20.6° | 1.1 mm/day | 66% | 3.9 m/s | 11.7 hours |
| April | 10.9 °C-0.6° to 26.2° | 1 mm/day | 59.1% | 3.8 m/s | 13.4 hours |
| May | 16.1 °C3° to 31.9° | 1 mm/day | 53.6% | 3.5 m/s | 14.8 hours |
| June | 20 °C7.8° to 35.9° | 0.8 mm/day | 48.6% | 3.7 m/s | 15.5 hours |
| July | 24.8 °C11.7° to 39.4° | 0.3 mm/day | 41.3% | 3.4 m/s | 15.2 hours |
| August | 24 °C11.6° to 38.6° | 0.3 mm/day | 40.8% | 3.3 m/s | 13.9 hours |
| September | 18.8 °C6.4° to 34.1° | 0.4 mm/day | 46.3% | 3.2 m/s | 12.3 hours |
| October | 11.5 °C-0.6° to 25.7° | 1 mm/day | 59.1% | 3.5 m/s | 10.6 hours |
| November | 5 °C-4.8° to 17.4° | 1.4 mm/day | 73.4% | 3.6 m/s | 9.2 hours |
| December | 0.9 °C-8.2° to 12.6° | 1.6 mm/day | 80.7% | 3.5 m/s | 8.5 hours |
See two months side by side and how much they differ. Both use the same 1991–2020 climate normals and NASA POWER data point as the table above, so they show typical conditions, not a forecast.
Comparative monthly averages for temperature, precipitation, humidity, wind, and daylight duration
Interactive climate map
Open the climate map to compare monthly temperature, precipitation, and other averages.
Examine monthly temperature, precipitation, and daylight rhythms across diverse geographic settings.








Continue your geographic exploration of Juniper Dunes Wilderness to understand how these dunes and juniper groves shape the regional character of eastern Washington. Use the MoriAtlas datasets to analyze the terrain, protected area boundaries, and ecological patterns within this distinctive Franklin County location.