Poso Park, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 41.2 °F (low) to 66 °F (high). Annual precipitation averages 27 Inches. Poso Park is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.8 °F | 52.8 °F | 5.19 in. |
| February | 31.2 °F | 51.5 °F | 5.64 in. |
| March | 32.8 °F | 55.7 °F | 4.05 in. |
| April | 35.9 °F | 59.0 °F | 2.3 in. |
| May | 42.0 °F | 67.9 °F | 0.98 in. |
| June | 48.5 °F | 77.7 °F | 0.46 in. |
| July | 55.9 °F | 84.9 °F | 0.06 in. |
| August | 55.8 °F | 84.7 °F | 0.09 in. |
| September | 51.5 °F | 79.6 °F | 0.17 in. |
| October | 42.9 °F | 68.6 °F | 1.24 in. |
| November | 36.1 °F | 58.8 °F | 2.19 in. |
| December | 30.9 °F | 50.9 °F | 4.59 in. |
| Annual | 41.2 °F | 66 °F | 26.96 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |