Superior, Arizona has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 12.8 °C (low) to 27 °C (high). Annual precipitation averages 416.3 Millimeters. 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 | 3.7 °C | 16.7 °C | 50.8 mm |
| February | 4.9 °C | 18.5 °C | 50.55 mm |
| March | 7.3 °C | 21.9 °C | 49.02 mm |
| April | 10.5 °C | 25.8 °C | 13.21 mm |
| May | 15.3 °C | 30.9 °C | 10.41 mm |
| June | 20.4 °C | 36.3 °C | 3.56 mm |
| July | 23.6 °C | 37.3 °C | 51.31 mm |
| August | 22.9 °C | 36.6 °C | 66.55 mm |
| September | 20.2 °C | 34.2 °C | 35.05 mm |
| October | 13.8 °C | 28.6 °C | 17.53 mm |
| November | 7.6 °C | 21.7 °C | 25.4 mm |
| December | 3.8 °C | 16 °C | 42.93 mm |
| Annual | 12.8 °C | 27 °C | 416.32 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |