Poso Park, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 5.1 °C (low) to 18.9 °C (high). Annual precipitation averages 684.8 Millimeters. 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 | -0.7 °C | 11.6 °C | 131.83 mm |
| February | -0.4 °C | 10.8 °C | 143.26 mm |
| March | 0.4 °C | 13.2 °C | 102.87 mm |
| April | 2.2 °C | 15 °C | 58.42 mm |
| May | 5.6 °C | 19.9 °C | 24.89 mm |
| June | 9.2 °C | 25.4 °C | 11.68 mm |
| July | 13.3 °C | 29.4 °C | 1.52 mm |
| August | 13.2 °C | 29.3 °C | 2.29 mm |
| September | 10.8 °C | 26.4 °C | 4.32 mm |
| October | 6.1 °C | 20.3 °C | 31.5 mm |
| November | 2.3 °C | 14.9 °C | 55.63 mm |
| December | -0.6 °C | 10.5 °C | 116.59 mm |
| Annual | 5.1 °C | 18.9 °C | 684.8 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |