Iron Horse, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 31.9 °F (low) to 63 °F (high). Annual precipitation averages 22.9 Inches. Iron Horse is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.3 °F | 43.9 °F | 4.19 in. |
| February | 22.7 °F | 47.1 °F | 3.7 in. |
| March | 26.5 °F | 52.7 °F | 3.5 in. |
| April | 30.0 °F | 57.6 °F | 1.6 in. |
| May | 35.7 °F | 66.3 °F | 1.18 in. |
| June | 41.3 °F | 76.7 °F | 0.46 in. |
| July | 46.1 °F | 86.1 °F | 0.18 in. |
| August | 44.1 °F | 85.0 °F | 0.22 in. |
| September | 38.7 °F | 79.0 °F | 0.44 in. |
| October | 31.4 °F | 66.4 °F | 1.02 in. |
| November | 24.9 °F | 52.6 °F | 2.08 in. |
| December | 20.5 °F | 42.8 °F | 4.36 in. |
| Annual | 31.9 °F | 63 °F | 22.93 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |