Glasgow, Delaware has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 18 °C (high). Annual precipitation averages 1209.8 Millimeters. Glasgow 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 | -4.2 °C | 5.1 °C | 87.12 mm |
| February | -3.7 °C | 6.6 °C | 74.68 mm |
| March | 0.3 °C | 11.1 °C | 109.22 mm |
| April | 6.1 °C | 17.7 °C | 95.25 mm |
| May | 11.5 °C | 22.9 °C | 98.04 mm |
| June | 16.7 °C | 27.8 °C | 122.17 mm |
| July | 19.6 °C | 30.3 °C | 117.6 mm |
| August | 18.7 °C | 29.2 °C | 104.9 mm |
| September | 14.8 °C | 25.9 °C | 111.51 mm |
| October | 8 °C | 19.3 °C | 101.35 mm |
| November | 2.4 °C | 13.1 °C | 82.3 mm |
| December | -1.4 °C | 7.5 °C | 105.66 mm |
| Annual | 7.4 °C | 18 °C | 1209.8 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |