Congress, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 11.1 °C (low) to 26.5 °C (high). Annual precipitation averages 294.4 Millimeters. Congress is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.5 °C | 16.3 °C | 42.42 mm |
| February | 3.6 °C | 17.7 °C | 38.1 mm |
| March | 5.5 °C | 21.1 °C | 36.32 mm |
| April | 8.3 °C | 24.9 °C | 8.89 mm |
| May | 12.9 °C | 29.8 °C | 6.86 mm |
| June | 17.8 °C | 35.4 °C | 2.79 mm |
| July | 21.8 °C | 37.3 °C | 28.45 mm |
| August | 21.8 °C | 36.4 °C | 33.53 mm |
| September | 18.2 °C | 33.6 °C | 20.07 mm |
| October | 12.2 °C | 27.7 °C | 21.08 mm |
| November | 6 °C | 21.3 °C | 17.78 mm |
| December | 2.3 °C | 16 °C | 38.1 mm |
| Annual | 11.1 °C | 26.5 °C | 294.39 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |