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Monthly climate in Saint Marys, Pennsylvania, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Saint Marys features a humid continental climate (Dfb).Temperatures typically range between -4 °C (26 °F) and 21 °C (71 °F) through the year, but rarely can drop to -26 °C (-15 °F) or can rise to as high as 33 °C (92 °F).The average annual precipitation amounts to about 1320 mm (52.0 inches) and receives 166 rainy days on the 1 mm (0.04 inches) threshold annually.Saint Marys enjoys an average of 2630 hours of sunshine throughout the year, and daylight varies from 9 hours 13 minutes to 15 hours 6 minutes per day.

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

The warmest months in Saint Marys are June, July and August, with daily mean temperatures ranging from 19 to 21 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to 0 °C (26 - 32 °F) throughout the day. On average each year, Saint Marys experiences 49 days above 25 °C (77.0 °F) and 118 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, Pennsylvania, 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 17°C
(63°F)		 21°C
(70°F)		 21°C
(71°F)		 27°C
(80°F)		 30°C
(85°F)		 32°C
(90°F)		 33°C
(92°F)		 33°C
(91°F)		 31°C
(87°F)		 27°C
(81°F)		 23°C
(74°F)		 16°C
(61°F)
Mean maximum 12°C
(54°F)		 15°C
(59°F)		 18°C
(65°F)		 23°C
(74°F)		 29°C
(84°F)		 30°C
(86°F)		 31°C
(87°F)		 30°C
(86°F)		 29°C
(84°F)		 25°C
(78°F)		 18°C
(65°F)		 12°C
(54°F)
Average high 0°C
(33°F)		 3°C
(37°F)		 7°C
(45°F)		 13°C
(56°F)		 19°C
(67°F)		 23°C
(74°F)		 26°C
(79°F)		 25°C
(78°F)		 22°C
(72°F)		 16°C
(61°F)		 7°C
(45°F)		 3°C
(37°F)
Daily mean -4°C
(26°F)		 -2°C
(29°F)		 2°C
(36°F)		 8°C
(46°F)		 14°C
(58°F)		 19°C
(66°F)		 21°C
(71°F)		 20°C
(69°F)		 17°C
(63°F)		 11°C
(53°F)		 3°C
(38°F)		 -0°C
(32°F)
Average low -8°C
(19°F)		 -6°C
(21°F)		 -2°C
(28°F)		 3°C
(38°F)		 9°C
(49°F)		 14°C
(57°F)		 17°C
(63°F)		 16°C
(61°F)		 12°C
(55°F)		 7°C
(45°F)		 -1°C
(31°F)		 -4°C
(26°F)
Mean minimum -21°C
(-5°F)		 -20°C
(-3°F)		 -14°C
(7°F)		 -4°C
(25°F)		 -0°C
(32°F)		 8°C
(46°F)		 11°C
(52°F)		 9°C
(49°F)		 5°C
(41°F)		 -1°C
(31°F)		 -10°C
(14°F)		 -13°C
(8°F)
Minimum -26°C
(-15°F)		 -25°C
(-12°F)		 -21°C
(-5°F)		 -6°C
(22°F)		 -4°C
(26°F)		 4°C
(39°F)		 9°C
(49°F)		 9°C
(48°F)		 1°C
(34°F)		 -3°C
(27°F)		 -18°C
(0°F)		 -18°C
(-0°F)

Compare climate in Saint Marys with other places

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

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

Saint Marys usually has the most precipitation in April, May and October, with an average of 15 rainy days and 131 mm (5.2 inches) of precipitation per month.The driest months in Saint Marys are January, March and August. On average, 92 mm (3.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint Marys, Pennsylvania, 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) 90 (3.5) 107 (4.2) 94 (3.7) 124 (4.9) 144 (5.7) 123 (4.9) 117 (4.6) 94 (3.7) 111 (4.4) 125 (4.9) 94 (3.7) 98 (3.9)
Average precipitation days (≥ 1 mm) 12 15 13 16 16 15 16 13 11 14 12 13

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

The sunniest months in Saint Marys are June, July and August, when the sun shines an average of 10 hours 13 minutes a day.Least sunny months in Saint Marys: January, February and December receive an average of 3 hours 57 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint Marys, Pennsylvania, 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 99 139 208 230 260 306 323 310 269 202 157 121
Mean daily daylight hours 9h 33m 10h 37m 11h 58m 13h 21m 14h 31m 15h 6m 14h 47m 13h 44m 12h 25m 11h 2m 9h 50m 9h 13m

Solar UV radiation in Saint Marys, Pennsylvania, 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, Pennsylvania, 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