Earlville, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36 °F (low) to 56.5 °F (high). Annual precipitation averages 39.2 Inches. Earlville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.4 °F | 25.9 °F | 1.24 in. |
| February | 12.2 °F | 30.4 °F | 1.34 in. |
| March | 24.0 °F | 43.5 °F | 2.14 in. |
| April | 35.2 °F | 57.5 °F | 3.94 in. |
| May | 47.0 °F | 69.1 °F | 4.71 in. |
| June | 57.5 °F | 78.8 °F | 5.91 in. |
| July | 60.9 °F | 81.8 °F | 4.77 in. |
| August | 58.4 °F | 80.0 °F | 4.36 in. |
| September | 49.6 °F | 73.7 °F | 3.83 in. |
| October | 37.7 °F | 60.6 °F | 3.03 in. |
| November | 26.0 °F | 44.9 °F | 2.27 in. |
| December | 15.4 °F | 31.8 °F | 1.67 in. |
| Annual | 36 °F | 56.5 °F | 39.21 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |