Garden Valley, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 34.6 °F (low) to 62.3 °F (high). Annual precipitation averages 26.6 Inches. Garden Valley is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.0 °F | 36.6 °F | 4.07 in. |
| February | 22.5 °F | 43.3 °F | 2.84 in. |
| March | 28.2 °F | 52.7 °F | 2.74 in. |
| April | 33.0 °F | 60.7 °F | 2.08 in. |
| May | 40.0 °F | 70.2 °F | 2.01 in. |
| June | 45.9 °F | 78.4 °F | 1.3 in. |
| July | 52.0 °F | 90.1 °F | 0.46 in. |
| August | 50.2 °F | 89.2 °F | 0.39 in. |
| September | 42.7 °F | 79.5 °F | 0.8 in. |
| October | 33.7 °F | 64.3 °F | 1.73 in. |
| November | 26.5 °F | 46.7 °F | 3.26 in. |
| December | 20.3 °F | 36.3 °F | 4.92 in. |
| Annual | 34.6 °F | 62.3 °F | 26.6 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |