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Monthly climate in Marietta, Ohio, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Marietta features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (34 °F) and 25 °C (76 °F) through the year, but rarely can drop to -21 °C (-5 °F) or can rise to as high as 36 °C (98 °F).The average annual precipitation amounts to about 1438 mm (56.6 inches) and receives 149 rainy days on the 1 mm (0.04 inches) threshold annually.Marietta enjoys an average of 2829 hours of sunshine throughout the year, and daylight varies from 9 hours 25 minutes to 14 hours 53 minutes per day.

Monthly average temperatures in Marietta, Ohio, United States §

The warmest months in Marietta are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (72 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 3 °C (34 - 39 °F) throughout the day. On average each year, Marietta experiences 106 days above 25 °C (77.0 °F) and 76 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Marietta, Ohio, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 22°C
(72°F)		 26°C
(80°F)		 27°C
(81°F)		 30°C
(86°F)		 32°C
(90°F)		 34°C
(93°F)		 35°C
(96°F)		 35°C
(94°F)		 36°C
(98°F)		 35°C
(95°F)		 26°C
(80°F)		 19°C
(66°F)
Mean maximum 17°C
(63°F)		 21°C
(70°F)		 24°C
(76°F)		 28°C
(82°F)		 31°C
(88°F)		 33°C
(91°F)		 34°C
(93°F)		 33°C
(93°F)		 33°C
(91°F)		 30°C
(86°F)		 23°C
(73°F)		 18°C
(64°F)
Average high 5°C
(41°F)		 8°C
(46°F)		 12°C
(54°F)		 18°C
(64°F)		 23°C
(74°F)		 27°C
(81°F)		 30°C
(86°F)		 29°C
(84°F)		 26°C
(80°F)		 20°C
(69°F)		 11°C
(53°F)		 7°C
(46°F)
Daily mean 1°C
(34°F)		 3°C
(38°F)		 7°C
(45°F)		 12°C
(54°F)		 18°C
(65°F)		 22°C
(72°F)		 25°C
(76°F)		 23°C
(74°F)		 21°C
(70°F)		 15°C
(59°F)		 7°C
(44°F)		 3°C
(39°F)
Average low -3°C
(27°F)		 -1°C
(30°F)		 2°C
(36°F)		 7°C
(45°F)		 13°C
(56°F)		 17°C
(63°F)		 20°C
(68°F)		 19°C
(66°F)		 16°C
(61°F)		 10°C
(51°F)		 2°C
(36°F)		 -0°C
(32°F)
Mean minimum -15°C
(5°F)		 -13°C
(9°F)		 -8°C
(18°F)		 -2°C
(29°F)		 4°C
(39°F)		 11°C
(52°F)		 15°C
(59°F)		 14°C
(57°F)		 9°C
(49°F)		 2°C
(37°F)		 -5°C
(23°F)		 -10°C
(15°F)
Minimum -21°C
(-5°F)		 -18°C
(0°F)		 -11°C
(12°F)		 -4°C
(25°F)		 -1°C
(30°F)		 6°C
(44°F)		 14°C
(57°F)		 13°C
(55°F)		 5°C
(42°F)		 -0°C
(32°F)		 -9°C
(16°F)		 -14°C
(7°F)

Compare climate in Marietta with other places

Compare temperature, precipitation, sunshine, UV index in Marietta, Ohio, United States with other places around the world.

Monthly average precipitation in Marietta, Ohio, United States §

Marietta usually has the most precipitation in April, May and June, with an average of 15 rainy days and 151 mm (5.9 inches) of precipitation per month.The driest months in Marietta are January, September and November. On average, 95 mm (3.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Marietta, Ohio, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 91 (3.6) 121 (4.8) 116 (4.6) 146 (5.7) 143 (5.6) 164 (6.5) 122 (4.8) 110 (4.3) 107 (4.2) 116 (4.6) 86 (3.4) 115 (4.5)
Average precipitation days (≥ 1 mm) 10 13 13 14 17 14 13 13 9 12 10 11

Monthly sunshine hours in Marietta, Ohio, United States §

The sunniest months in Marietta are June, July and August, when the sun shines an average of 10 hours 33 minutes a day.Least sunny months in Marietta: January, February and December receive an average of 4 hours 23 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Marietta, Ohio, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 111 141 234 242 278 307 344 318 280 235 188 146
Mean daily daylight hours 9h 44m 10h 43m 11h 58m 13h 15m 14h 21m 14h 53m 14h 35m 13h 37m 12h 23m 11h 6m 9h 59m 9h 25m

Solar UV radiation in Marietta, Ohio, United States §

Marietta experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Marietta UV Index data.

Average daily maximum UV levels by month for Marietta, Ohio, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 7 9 10 10 10 9 8 6 4 3