Mormon Lake, Arizona has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 0.6 °C (low) to 16.8 °C (high). Annual precipitation averages 688.3 Millimeters. Mormon Lake is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.4 °C | 6.8 °C | 78.23 mm |
| February | -6.3 °C | 8.1 °C | 86.11 mm |
| March | -4 °C | 11.5 °C | 71.12 mm |
| April | -1.7 °C | 15.1 °C | 34.54 mm |
| May | 2.4 °C | 19.9 °C | 22.86 mm |
| June | 7 °C | 26.2 °C | 8.13 mm |
| July | 11.1 °C | 27.9 °C | 57.66 mm |
| August | 10.3 °C | 26.4 °C | 105.66 mm |
| September | 6.4 °C | 23.6 °C | 50.55 mm |
| October | 0.7 °C | 17.7 °C | 42.16 mm |
| November | -4.2 °C | 11.4 °C | 56.13 mm |
| December | -7.7 °C | 6.7 °C | 75.18 mm |
| Annual | 0.6 °C | 16.8 °C | 688.33 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |