New Castle Delaware Climate Data

Monthly Average Climate Data for New Castle Delaware

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January25.0 °F40.6 °F3.44 in.
February26.2 °F43.2 °F2.9 in.
March33.3 °F51.0 °F4.27 in.
April43.7 °F62.9 °F3.64 in.
May53.6 °F72.4 °F3.72 in.
June63.0 °F81.4 °F4.63 in.
July68.2 °F85.9 °F4.57 in.
August66.6 °F84.0 °F4.16 in.
September59.7 °F78.0 °F4.27 in.
October47.2 °F66.3 °F3.92 in.
November37.0 °F55.4 °F3.13 in.
December30.0 °F45.6 °F4.14 in.
Annual46.1 °F63.9 °F46.79 in.

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 : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation