Spirit Lake, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 0.4 °C (low) to 13.5 °C (high). Annual precipitation averages 701.8 Millimeters. Spirit Lake is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.2 °C | 0.9 °C | 87.63 mm |
| February | -6.1 °C | 3.8 °C | 64.77 mm |
| March | -3.6 °C | 8.2 °C | 85.09 mm |
| April | -0.8 °C | 12.7 °C | 51.82 mm |
| May | 3.3 °C | 18.1 °C | 55.88 mm |
| June | 6.3 °C | 21.5 °C | 47.24 mm |
| July | 8.7 °C | 27.4 °C | 16.26 mm |
| August | 8.3 °C | 27.7 °C | 19.56 mm |
| September | 4.4 °C | 21.9 °C | 21.84 mm |
| October | 0 °C | 13.3 °C | 57.15 mm |
| November | -3.2 °C | 5.3 °C | 88.65 mm |
| December | -6.2 °C | 0.6 °C | 105.92 mm |
| Annual | 0.4 °C | 13.5 °C | 701.81 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |