Mount Pulaski, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.2 °F (low) to 62.7 °F (high). Annual precipitation averages 38.8 Inches. Mount Pulaski 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 | 17.9 °F | 34.5 °F | 2.18 in. |
| February | 21.1 °F | 39.4 °F | 2.06 in. |
| March | 30.3 °F | 50.9 °F | 2.74 in. |
| April | 41.3 °F | 64.0 °F | 4.05 in. |
| May | 52.8 °F | 74.1 °F | 4.36 in. |
| June | 61.8 °F | 83.0 °F | 4.44 in. |
| July | 64.8 °F | 85.9 °F | 4.2 in. |
| August | 63.0 °F | 84.0 °F | 3.33 in. |
| September | 54.6 °F | 79.1 °F | 3.02 in. |
| October | 42.9 °F | 66.3 °F | 3.29 in. |
| November | 32.1 °F | 51.5 °F | 2.87 in. |
| December | 23.5 °F | 39.4 °F | 2.24 in. |
| Annual | 42.2 °F | 62.7 °F | 38.78 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |