Georgetown, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 16.4 °C (high). Annual precipitation averages 989.8 Millimeters. Georgetown is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 1.2 °C | 64.01 mm |
| February | -5.9 °C | 3.7 °C | 55.37 mm |
| March | -0.7 °C | 10.2 °C | 74.93 mm |
| April | 5.2 °C | 17.6 °C | 107.95 mm |
| May | 11.4 °C | 23.4 °C | 116.59 mm |
| June | 16.5 °C | 28 °C | 123.95 mm |
| July | 17.9 °C | 29.3 °C | 107.7 mm |
| August | 16.7 °C | 28.6 °C | 81.79 mm |
| September | 12.5 °C | 26 °C | 76.96 mm |
| October | 6.2 °C | 19.1 °C | 86.87 mm |
| November | 0.4 °C | 10.8 °C | 85.6 mm |
| December | -4.5 °C | 3.9 °C | 65.28 mm |
| Annual | 5.7 °C | 16.8 °C | 1047 mm |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.9 °C | 0.4 °C | 46.23 mm |
| February | -6.8 °C | 3 °C | 48.51 mm |
| March | -1.2 °C | 9.9 °C | 58.67 mm |
| April | 4.7 °C | 17.1 °C | 99.57 mm |
| May | 11.4 °C | 22.9 °C | 130.81 mm |
| June | 16.7 °C | 27.8 °C | 125.22 mm |
| July | 18.4 °C | 29.6 °C | 100.58 mm |
| August | 17.1 °C | 28.7 °C | 89.15 mm |
| September | 12.4 °C | 25.6 °C | 95.25 mm |
| October | 6.1 °C | 18.7 °C | 79.25 mm |
| November | -0.3 °C | 10.3 °C | 68.07 mm |
| December | -5.7 °C | 3.3 °C | 48.51 mm |
| Annual | 5.3 °C | 16.4 °C | 989.82 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |