Jerome, Arizona has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 47.5 °F (low) to 70.8 °F (high). Annual precipitation averages 17.7 Inches. Jerome is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.9 °F | 51.7 °F | 1.74 in. |
| February | 34.4 °F | 55.0 °F | 1.88 in. |
| March | 38.4 °F | 61.5 °F | 1.57 in. |
| April | 43.4 °F | 68.6 °F | 0.78 in. |
| May | 50.6 °F | 77.2 °F | 0.57 in. |
| June | 60.3 °F | 88.5 °F | 0.19 in. |
| July | 65.5 °F | 91.1 °F | 2.22 in. |
| August | 64.2 °F | 88.4 °F | 3.16 in. |
| September | 58.8 °F | 83.0 °F | 1.64 in. |
| October | 48.9 °F | 72.8 °F | 1.35 in. |
| November | 39.6 °F | 61.1 °F | 1.06 in. |
| December | 32.6 °F | 50.8 °F | 1.52 in. |
| Annual | 47.5 °F | 70.8 °F | 17.68 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 30-40 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 | Moderate Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |