Washington Park, Arizona has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 37.9 °F (low) to 67.1 °F (high). Annual precipitation averages 28.3 Inches. Washington Park is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.2 °F | 49.7 °F | 3.89 in. |
| February | 25.5 °F | 51.6 °F | 3.24 in. |
| March | 29.1 °F | 57.4 °F | 3.1 in. |
| April | 33.7 °F | 63.8 °F | 1.03 in. |
| May | 40.2 °F | 72.8 °F | 0.87 in. |
| June | 48.3 °F | 83.9 °F | 0.35 in. |
| July | 56.2 °F | 86.5 °F | 3.08 in. |
| August | 55.3 °F | 84.1 °F | 3.59 in. |
| September | 49.2 °F | 79.1 °F | 2.26 in. |
| October | 38.9 °F | 69.4 °F | 1.53 in. |
| November | 30.1 °F | 58.1 °F | 2.1 in. |
| December | 24.0 °F | 49.3 °F | 3.29 in. |
| Annual | 37.9 °F | 67.1 °F | 28.33 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |