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Monthly climate in Saint Marys, Ohio, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Saint Marys features a humid continental climate (Dfa). Temperatures typically range between -2 °C (30 °F) and 24 °C (76 °F) through the year, but rarely can drop to -25 °C (-13 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 1163 mm (45.8 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually. Saint Marys enjoys an average of 2874 hours of sunshine throughout the year, and daylight varies from 9 hours 18 minutes to 15 hours 0 minutes per day.

Monthly average temperatures in Saint Marys, Ohio, United States §

The warmest months in Saint Marys are June, July and August, with daily mean temperatures ranging from 22 to 24 °C (72 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 2 °C (30 - 35 °F) throughout the day. On average each year, Saint Marys experiences 93 days above 25 °C (77.0 °F) and 93 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Saint Marys, 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 18°C
(65°F)		 23°C
(74°F)		 24°C
(75°F)		 29°C
(84°F)		 33°C
(92°F)		 34°C
(93°F)		 34°C
(93°F)		 33°C
(91°F)		 33°C
(92°F)		 33°C
(91°F)		 26°C
(78°F)		 18°C
(64°F)
Mean maximum 14°C
(58°F)		 17°C
(63°F)		 21°C
(69°F)		 27°C
(80°F)		 31°C
(87°F)		 33°C
(91°F)		 33°C
(91°F)		 32°C
(89°F)		 32°C
(90°F)		 29°C
(85°F)		 20°C
(68°F)		 16°C
(61°F)
Average high 2°C
(36°F)		 4°C
(40°F)		 10°C
(51°F)		 16°C
(61°F)		 22°C
(72°F)		 27°C
(80°F)		 29°C
(84°F)		 28°C
(82°F)		 26°C
(78°F)		 19°C
(66°F)		 9°C
(49°F)		 6°C
(43°F)
Daily mean -2°C
(30°F)		 0°C
(32°F)		 5°C
(42°F)		 10°C
(51°F)		 17°C
(63°F)		 22°C
(72°F)		 24°C
(76°F)		 23°C
(73°F)		 20°C
(69°F)		 14°C
(57°F)		 5°C
(42°F)		 2°C
(35°F)
Average low -5°C
(23°F)		 -4°C
(25°F)		 0°C
(33°F)		 5°C
(42°F)		 12°C
(55°F)		 17°C
(64°F)		 20°C
(68°F)		 18°C
(65°F)		 15°C
(60°F)		 9°C
(49°F)		 1°C
(34°F)		 -2°C
(29°F)
Mean minimum -18°C
(-1°F)		 -16°C
(4°F)		 -9°C
(16°F)		 -5°C
(23°F)		 3°C
(37°F)		 11°C
(52°F)		 14°C
(58°F)		 12°C
(54°F)		 8°C
(46°F)		 0°C
(33°F)		 -8°C
(18°F)		 -13°C
(10°F)
Minimum -25°C
(-13°F)		 -21°C
(-6°F)		 -13°C
(8°F)		 -9°C
(16°F)		 -1°C
(30°F)		 7°C
(45°F)		 12°C
(54°F)		 10°C
(51°F)		 4°C
(40°F)		 -2°C
(29°F)		 -16°C
(4°F)		 -22°C
(-8°F)

Compare climate in Saint Marys with other places

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

Monthly average precipitation in Saint Marys, Ohio, United States §

Saint Marys usually has the most precipitation in May, June and August, with an average of 13 rainy days and 121 mm (4.8 inches) of precipitation per month. The driest months in Saint Marys are January, September and December. On average, 72 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint Marys, 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) 74 (2.9) 93 (3.7) 102 (4.0) 98 (3.9) 130 (5.1) 125 (4.9) 109 (4.3) 109 (4.3) 73 (2.9) 96 (3.8) 85 (3.4) 69 (2.7)
Average precipitation days (≥ 1 mm) 9 12 12 13 15 13 13 11 7 13 8 10

Monthly sunshine hours in Saint Marys, Ohio, United States §

The sunniest months in Saint Marys are June, July and August, when the sun shines an average of 10 hours 53 minutes a day. Least sunny months in Saint Marys: January, February and December receive an average of 4 hours 44 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint Marys, 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 112 160 226 231 280 322 354 324 284 230 187 158
Mean daily daylight hours 9h 38m 10h 39m 11h 58m 13h 19m 14h 26m 15h 0m 14h 42m 13h 41m 12h 24m 11h 4m 9h 54m 9h 18m

Solar UV radiation in Saint Marys, Ohio, United States §

Saint Marys 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 Low / 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 Saint Marys UV Index data.

Average daily maximum UV levels by month for Saint Marys, 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 6 9 10 10 10 9 8 6 4 2

Detailed Monthly Weather Insights for Saint Marys, Ohio, United States

Discover in-depth weather details for every month in Saint Marys. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Saint Marys's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.