Loyalton, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 0.6 °C (low) to 17.8 °C (high). Annual precipitation averages 490 Millimeters. Loyalton is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 6.8 °C | 87.63 mm |
| February | -4.8 °C | 8.8 °C | 77.98 mm |
| March | -2.4 °C | 11.9 °C | 67.06 mm |
| April | -0.5 °C | 15.2 °C | 32.77 mm |
| May | 2.7 °C | 19.9 °C | 39.62 mm |
| June | 6.1 °C | 25.6 °C | 10.67 mm |
| July | 9.2 °C | 30.6 °C | 6.1 mm |
| August | 8 °C | 30.2 °C | 6.35 mm |
| September | 4.8 °C | 26.6 °C | 8.89 mm |
| October | 0.4 °C | 19.8 °C | 23.11 mm |
| November | -3.7 °C | 11.9 °C | 42.16 mm |
| December | -6.2 °C | 6.4 °C | 87.63 mm |
| Annual | 0.6 °C | 17.8 °C | 489.97 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 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 |