Lava Hot Springs, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.4 °F (low) to 57.9 °F (high). Annual precipitation averages 19 Inches. 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 | 12.7 °F | 31.9 °F | 1.96 in. |
| February | 15.5 °F | 36.3 °F | 1.53 in. |
| March | 23.4 °F | 46.1 °F | 1.9 in. |
| April | 29.6 °F | 55.6 °F | 1.87 in. |
| May | 37.0 °F | 65.3 °F | 2.25 in. |
| June | 43.1 °F | 75.5 °F | 1.39 in. |
| July | 49.4 °F | 86.5 °F | 0.86 in. |
| August | 48.0 °F | 85.3 °F | 1.09 in. |
| September | 39.5 °F | 74.6 °F | 1.44 in. |
| October | 30.5 °F | 59.7 °F | 1.53 in. |
| November | 21.7 °F | 44.4 °F | 1.3 in. |
| December | 14.1 °F | 33.1 °F | 1.92 in. |
| Annual | 30.4 °F | 57.9 °F | 19.04 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |