Eldersburg, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 18.5 °C (high). Annual precipitation averages 1199.9 Millimeters. Eldersburg is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 5.2 °C | 87.63 mm |
| February | -3.3 °C | 7 °C | 72.9 mm |
| March | 0.4 °C | 11.8 °C | 105.66 mm |
| April | 5.9 °C | 18.8 °C | 94.23 mm |
| May | 11.2 °C | 23.9 °C | 112.01 mm |
| June | 16.2 °C | 28.6 °C | 109.47 mm |
| July | 18.8 °C | 30.8 °C | 110.24 mm |
| August | 17.8 °C | 29.7 °C | 99.82 mm |
| September | 14.1 °C | 26 °C | 117.86 mm |
| October | 7.7 °C | 19.4 °C | 105.66 mm |
| November | 2.4 °C | 13.1 °C | 84.07 mm |
| December | -1.6 °C | 7.5 °C | 100.33 mm |
| Annual | 7.1 °C | 18.5 °C | 1199.88 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |