Alhambra, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.6 °C (low) to 18.3 °C (high). Annual precipitation averages 1104.2 Millimeters. Alhambra is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.6 °C | 3.3 °C | 68.07 mm |
| February | -3.6 °C | 6.4 °C | 59.44 mm |
| March | 1.3 °C | 12.2 °C | 83.82 mm |
| April | 7.2 °C | 18.8 °C | 123.19 mm |
| May | 13.2 °C | 24.1 °C | 128.78 mm |
| June | 18.2 °C | 29 °C | 116.59 mm |
| July | 20 °C | 30.7 °C | 105.16 mm |
| August | 18.9 °C | 30.2 °C | 91.44 mm |
| September | 14.2 °C | 26.8 °C | 83.31 mm |
| October | 7.8 °C | 20.2 °C | 83.57 mm |
| November | 1.9 °C | 12.3 °C | 91.69 mm |
| December | -2.9 °C | 6 °C | 69.09 mm |
| Annual | 7.6 °C | 18.3 °C | 1104.15 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |