Hyampom, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 41.9 °F (low) to 72.4 °F (high). Annual precipitation averages 43.2 Inches. Hyampom is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.9 °F | 50.6 °F | 8.23 in. |
| February | 34.5 °F | 56.0 °F | 6.16 in. |
| March | 36.2 °F | 61.6 °F | 5.88 in. |
| April | 38.7 °F | 69.2 °F | 2.81 in. |
| May | 43.8 °F | 78.4 °F | 1.47 in. |
| June | 48.5 °F | 86.8 °F | 0.41 in. |
| July | 54.2 °F | 97.0 °F | 0.18 in. |
| August | 53.0 °F | 96.8 °F | 0.07 in. |
| September | 47.7 °F | 90.2 °F | 0.48 in. |
| October | 41.2 °F | 75.4 °F | 2.31 in. |
| November | 37.3 °F | 58.2 °F | 5.42 in. |
| December | 33.8 °F | 48.6 °F | 9.75 in. |
| Annual | 41.9 °F | 72.4 °F | 43.17 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |