Marietta Ohio Climate Data

Monthly Average Climate Data for Marietta Ohio

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January21.6 °F39.5 °F3.3 in.
February23.1 °F43.0 °F3.06 in.
March30.0 °F52.6 °F4.01 in.
April40.4 °F66.5 °F3.79 in.
May50.6 °F74.8 °F4.36 in.
June59.8 °F82.3 °F4.7 in.
July63.4 °F85.7 °F4.72 in.
August62.5 °F85.0 °F3.64 in.
September54.8 °F78.7 °F3.38 in.
October42.4 °F67.2 °F2.82 in.
November32.8 °F54.7 °F2.93 in.
December26.7 °F44.2 °F3.4 in.
Annual42.3 °F64.5 °F44.11 in.

Climate Data for Marietta Ohio

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation