Grace, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.4 °C (low) to 14 °C (high). Annual precipitation averages 372.9 Millimeters. Grace is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.3 °C | -0.4 °C | 28.7 mm |
| February | -9.9 °C | 1.8 °C | 25.15 mm |
| March | -5.6 °C | 7.1 °C | 33.53 mm |
| April | -1.8 °C | 12.6 °C | 35.56 mm |
| May | 2.3 °C | 18.2 °C | 57.91 mm |
| June | 5.7 °C | 23.6 °C | 34.8 mm |
| July | 9.1 °C | 29.7 °C | 19.56 mm |
| August | 8.3 °C | 29.4 °C | 26.42 mm |
| September | 3.8 °C | 23.6 °C | 32.77 mm |
| October | -1.1 °C | 15.3 °C | 32.26 mm |
| November | -6.2 °C | 6.4 °C | 23.37 mm |
| December | -10.6 °C | 0.3 °C | 22.86 mm |
| Annual | -1.4 °C | 14 °C | 372.89 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |