Ramsey, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 17.7 °C (high). Annual precipitation averages 1082.3 Millimeters. Ramsey 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 | -6.6 °C | 2.3 °C | 71.63 mm |
| February | -4.6 °C | 5.2 °C | 56.9 mm |
| March | 0.3 °C | 11.3 °C | 79.5 mm |
| April | 6.1 °C | 18.3 °C | 119.89 mm |
| May | 12.2 °C | 23.8 °C | 121.92 mm |
| June | 17.1 °C | 28.7 °C | 114.05 mm |
| July | 18.8 °C | 30.4 °C | 102.87 mm |
| August | 17.4 °C | 29.8 °C | 87.38 mm |
| September | 12.9 °C | 26.7 °C | 81.28 mm |
| October | 6.6 °C | 19.9 °C | 90.42 mm |
| November | 0.9 °C | 11.5 °C | 90.42 mm |
| December | -3.7 °C | 5 °C | 66.04 mm |
| Annual | 6.5 °C | 17.7 °C | 1082.3 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |