
Hells Canyon National Recreation Area
- Annual mean
- 5.3 °C
- Warmest month
- July
- Wettest month
- December
Reviewing 1991 to 2020 climatology normals for temperature, precipitation, and daylight.
Annual climate rhythms for Payette National Forest are detailed through monthly averages for temperature, precipitation, humidity, wind, and daylight hours. Derived from 1991 to 2020 NASA POWER measurements at a representative 1678 meter elevation, the dataset provides a consistent long-term atmospheric perspective. These normals distinguish seasonal expectations from current weather patterns, serving as a baseline for understanding the environmental conditions within this protected landscape in Idaho.

Long term monthly temperature ranges and average daily precipitation rates across twelve months
Track long-term monthly temperature bounds, average precipitation rates, humidity, wind speed, and daylight hours across the calendar year.
| Mean temperature | Precipitation | Humidity | Wind speed | Daylight | |
|---|---|---|---|---|---|
| January | -7 °C-21.7° to 0.6° | 3.1 mm/day | 96.8% | 2.3 m/s | 9 hours |
| February | -5.8 °C-20.1° to 1.5° | 2.8 mm/day | 95.4% | 2.2 m/s | 10.2 hours |
| March | -2.2 °C-16° to 8.8° | 2.9 mm/day | 88.6% | 2.1 m/s | 11.7 hours |
| April | 2.5 °C-9° to 17.7° | 2.4 mm/day | 75.9% | 2.1 m/s | 13.3 hours |
| May | 8 °C-4.3° to 22.9° | 2.3 mm/day | 69.8% | 1.9 m/s | 14.7 hours |
| June | 12.1 °C-1.1° to 27° | 1.8 mm/day | 66.8% | 1.8 m/s | 15.4 hours |
| July | 17.6 °C3.7° to 31.4° | 0.6 mm/day | 56.2% | 1.8 m/s | 15 hours |
| August | 17.3 °C3.4° to 31.3° | 0.5 mm/day | 50% | 1.9 m/s | 13.8 hours |
| September | 12.4 °C-2.1° to 28.5° | 0.9 mm/day | 53.4% | 1.9 m/s | 12.3 hours |
| October | 4.9 °C-7° to 21.6° | 1.7 mm/day | 65.5% | 2 m/s | 10.7 hours |
| November | -2.2 °C-15° to 10.7° | 2.9 mm/day | 83.4% | 2.2 m/s | 9.3 hours |
| December | -6.9 °C-20.9° to 1.8° | 3.7 mm/day | 95% | 2.3 m/s | 8.7 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 analysis of long term 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.
Month by month atmospheric normals across diverse geographic settings and protected landscapes








Investigate the expansive mountain terrain and protected forest boundaries that define Payette National Forest. Use MoriAtlas to trace the glacial lakes, granite ridges, and river systems that constitute one of the most significant wilderness areas in the United States.