Caspar, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.6 °F (low) to 61.2 °F (high). Annual precipitation averages 41.1 Inches. Caspar is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.5 °F | 55.9 °F | 7.33 in. |
| February | 43.4 °F | 56.0 °F | 6.51 in. |
| March | 43.8 °F | 57.0 °F | 6.07 in. |
| April | 44.5 °F | 59.7 °F | 3.21 in. |
| May | 46.8 °F | 61.8 °F | 2.0 in. |
| June | 49.1 °F | 64.5 °F | 0.64 in. |
| July | 49.7 °F | 65.5 °F | 0.1 in. |
| August | 50.6 °F | 66.5 °F | 0.2 in. |
| September | 50.1 °F | 67.0 °F | 0.23 in. |
| October | 48.3 °F | 64.5 °F | 2.23 in. |
| November | 45.8 °F | 58.8 °F | 4.51 in. |
| December | 43.2 °F | 56.7 °F | 8.06 in. |
| Annual | 46.6 °F | 61.2 °F | 41.09 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |