Susanville, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 35 °F (low) to 64.6 °F (high). Annual precipitation averages 15.2 Inches. Susanville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.6 °F | 43.2 °F | 2.63 in. |
| February | 24.8 °F | 47.3 °F | 2.58 in. |
| March | 29.4 °F | 54.0 °F | 1.8 in. |
| April | 32.5 °F | 60.3 °F | 0.83 in. |
| May | 39.0 °F | 70.0 °F | 0.83 in. |
| June | 45.0 °F | 80.1 °F | 0.53 in. |
| July | 51.1 °F | 89.4 °F | 0.3 in. |
| August | 49.3 °F | 88.0 °F | 0.12 in. |
| September | 42.7 °F | 80.9 °F | 0.2 in. |
| October | 34.6 °F | 67.0 °F | 1.07 in. |
| November | 27.0 °F | 52.2 °F | 1.36 in. |
| December | 21.7 °F | 42.4 °F | 2.9 in. |
| Annual | 35 °F | 64.6 °F | 15.15 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |