Superior, Arizona has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 55.1 °F (low) to 80.7 °F (high). Annual precipitation averages 16.4 Inches. Superior is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.7 °F | 62.0 °F | 2.0 in. |
| February | 40.8 °F | 65.3 °F | 1.99 in. |
| March | 45.1 °F | 71.4 °F | 1.93 in. |
| April | 50.9 °F | 78.5 °F | 0.52 in. |
| May | 59.5 °F | 87.6 °F | 0.41 in. |
| June | 68.7 °F | 97.4 °F | 0.14 in. |
| July | 74.4 °F | 99.2 °F | 2.02 in. |
| August | 73.3 °F | 97.8 °F | 2.62 in. |
| September | 68.3 °F | 93.5 °F | 1.38 in. |
| October | 56.8 °F | 83.4 °F | 0.69 in. |
| November | 45.7 °F | 71.1 °F | 1.0 in. |
| December | 38.8 °F | 60.8 °F | 1.69 in. |
| Annual | 55.1 °F | 80.7 °F | 16.39 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |