Elsmere, Delaware has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.7 °C (low) to 17.6 °C (high). Annual precipitation averages 1212.9 Millimeters. Elsmere is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.9 °C | 4.6 °C | 88.39 mm |
| February | -3.3 °C | 6.1 °C | 73.66 mm |
| March | 0.6 °C | 10.4 °C | 110.24 mm |
| April | 6.4 °C | 17.2 °C | 94.74 mm |
| May | 11.8 °C | 22.3 °C | 96.27 mm |
| June | 17 °C | 27.4 °C | 118.36 mm |
| July | 19.9 °C | 29.9 °C | 120.4 mm |
| August | 19.1 °C | 28.8 °C | 109.73 mm |
| September | 15.2 °C | 25.4 °C | 111.51 mm |
| October | 8.3 °C | 18.9 °C | 100.08 mm |
| November | 2.8 °C | 12.8 °C | 81.28 mm |
| December | -1.2 °C | 7.3 °C | 108.2 mm |
| Annual | 7.7 °C | 17.6 °C | 1212.86 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |