Iron Horse, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from -0.1 °C (low) to 17.2 °C (high). Annual precipitation averages 582.4 Millimeters. 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 | -6.5 °C | 6.6 °C | 106.43 mm |
| February | -5.2 °C | 8.4 °C | 93.98 mm |
| March | -3.1 °C | 11.5 °C | 88.9 mm |
| April | -1.1 °C | 14.2 °C | 40.64 mm |
| May | 2.1 °C | 19.1 °C | 29.97 mm |
| June | 5.2 °C | 24.8 °C | 11.68 mm |
| July | 7.8 °C | 30.1 °C | 4.57 mm |
| August | 6.7 °C | 29.4 °C | 5.59 mm |
| September | 3.7 °C | 26.1 °C | 11.18 mm |
| October | -0.3 °C | 19.1 °C | 25.91 mm |
| November | -3.9 °C | 11.4 °C | 52.83 mm |
| December | -6.4 °C | 6 °C | 110.74 mm |
| Annual | -0.1 °C | 17.2 °C | 582.42 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |