Marietta Pennsylvania Climate Data

Monthly Average Climate Data for Marietta Pennsylvania

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January22.9 °F39.2 °F3.12 in.
February23.9 °F41.8 °F2.55 in.
March31.5 °F50.8 °F3.76 in.
April41.6 °F63.7 °F3.47 in.
May51.8 °F73.3 °F3.92 in.
June61.4 °F81.9 °F4.25 in.
July65.8 °F86.4 °F4.37 in.
August64.0 °F84.8 °F3.93 in.
September56.9 °F77.8 °F4.74 in.
October45.4 °F65.7 °F4.21 in.
November35.4 °F54.2 °F3.12 in.
December28.0 °F43.5 °F3.53 in.
Annual44.1 °F63.6 °F44.97 in.

Climate Data for Marietta Pennsylvania

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation