New Castle Delaware Climate Data

Monthly Average Climate Data for New Castle Delaware

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-3.9 °C4.8 °C87.38 mm
February-3.2 °C6.2 °C73.66 mm
March0.7 °C10.6 °C108.46 mm
April6.5 °C17.2 °C92.46 mm
May12 °C22.4 °C94.49 mm
June17.2 °C27.4 °C117.6 mm
July20.1 °C29.9 °C116.08 mm
August19.2 °C28.9 °C105.66 mm
September15.4 °C25.6 °C108.46 mm
October8.4 °C19.1 °C99.57 mm
November2.8 °C13 °C79.5 mm
December-1.1 °C7.6 °C105.16 mm
Annual7.8 °C17.7 °C1188.48 mm

Climate Data for New Castle Delaware

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7b : -15°C to -12.2°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation