Lava Hot Springs, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.9 °C (low) to 14.4 °C (high). Annual precipitation averages 483.6 Millimeters. Lava Hot Springs is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.7 °C | -0.1 °C | 49.78 mm |
| February | -9.2 °C | 2.4 °C | 38.86 mm |
| March | -4.8 °C | 7.8 °C | 48.26 mm |
| April | -1.3 °C | 13.1 °C | 47.5 mm |
| May | 2.8 °C | 18.5 °C | 57.15 mm |
| June | 6.2 °C | 24.2 °C | 35.31 mm |
| July | 9.7 °C | 30.3 °C | 21.84 mm |
| August | 8.9 °C | 29.6 °C | 27.69 mm |
| September | 4.2 °C | 23.7 °C | 36.58 mm |
| October | -0.8 °C | 15.4 °C | 38.86 mm |
| November | -5.7 °C | 6.9 °C | 33.02 mm |
| December | -9.9 °C | 0.6 °C | 48.77 mm |
| Annual | -0.9 °C | 14.4 °C | 483.62 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |