Jefferson Maryland Climate Data

Monthly Average Climate Data for Jefferson Maryland

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4.1 °C5 °C75.95 mm
February-3.3 °C6.9 °C61.98 mm
March0.5 °C11.6 °C91.69 mm
April5.8 °C18.4 °C87.38 mm
May11.2 °C23.3 °C109.22 mm
June16.1 °C27.9 °C101.85 mm
July18.6 °C30.4 °C107.44 mm
August17.5 °C29.4 °C81.03 mm
September13.8 °C25.6 °C114.05 mm
October7.6 °C19.2 °C90.68 mm
November2.1 °C13 °C78.23 mm
December-1.9 °C7.2 °C90.68 mm
Annual7 °C18.2 °C1090.18 mm

Climate Data for Jefferson Maryland

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation