Warm River, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.9 °C (low) to 12.5 °C (high). Annual precipitation averages 556.3 Millimeters. Warm River is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.2 °C | -1.9 °C | 59.18 mm |
| February | -10.6 °C | 0.4 °C | 46.99 mm |
| March | -6.1 °C | 5.9 °C | 48.26 mm |
| April | -2.1 °C | 11.7 °C | 52.58 mm |
| May | 2.4 °C | 17.4 °C | 63.5 mm |
| June | 5.8 °C | 22.2 °C | 48.01 mm |
| July | 8.6 °C | 27.8 °C | 20.07 mm |
| August | 7.5 °C | 27.6 °C | 24.13 mm |
| September | 3.7 °C | 22 °C | 35.31 mm |
| October | -1.4 °C | 13.6 °C | 46.74 mm |
| November | -6.7 °C | 4.7 °C | 48.51 mm |
| December | -11.3 °C | -1.6 °C | 62.99 mm |
| Annual | -1.9 °C | 12.5 °C | 556.27 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |