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Monthly climate in St. Marys, Georgia, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification St. Marys features a humid subtropical climate (Cfa).Temperatures typically range between 13 °C (56 °F) and 27 °C (82 °F) through the year, but rarely can drop to -3 °C (28 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1197 mm (47.1 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually.St. Marys enjoys an average of 3319 hours of sunshine throughout the year, and daylight varies from 10 hours 10 minutes to 14 hours 5 minutes per day.

Monthly average temperatures in St. Marys, Georgia, United States §

The warmest months in St. Marys are July, August and September, with daily mean temperatures ranging from 26 to 27 °C (80 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 16 °C (56 - 61 °F) throughout the day. On average each year, St. Marys experiences 178 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in St. Marys, Georgia, 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 27°C
(80°F)		 27°C
(81°F)		 31°C
(88°F)		 32°C
(89°F)		 35°C
(95°F)		 34°C
(94°F)		 34°C
(94°F)		 34°C
(94°F)		 34°C
(94°F)		 32°C
(90°F)		 31°C
(87°F)		 26°C
(78°F)
Mean maximum 25°C
(76°F)		 26°C
(79°F)		 28°C
(83°F)		 29°C
(85°F)		 32°C
(90°F)		 32°C
(90°F)		 34°C
(93°F)		 33°C
(92°F)		 33°C
(92°F)		 31°C
(87°F)		 27°C
(82°F)		 25°C
(77°F)
Average high 17°C
(63°F)		 20°C
(68°F)		 22°C
(72°F)		 25°C
(77°F)		 28°C
(82°F)		 30°C
(86°F)		 31°C
(87°F)		 31°C
(87°F)		 29°C
(85°F)		 27°C
(81°F)		 21°C
(71°F)		 19°C
(66°F)
Daily mean 13°C
(56°F)		 16°C
(61°F)		 18°C
(64°F)		 21°C
(69°F)		 24°C
(75°F)		 26°C
(80°F)		 27°C
(81°F)		 27°C
(82°F)		 26°C
(80°F)		 24°C
(75°F)		 18°C
(64°F)		 15°C
(59°F)
Average low 10°C
(49°F)		 12°C
(54°F)		 14°C
(57°F)		 17°C
(62°F)		 21°C
(69°F)		 24°C
(75°F)		 25°C
(77°F)		 25°C
(77°F)		 24°C
(75°F)		 21°C
(70°F)		 14°C
(58°F)		 11°C
(52°F)
Mean minimum 0°C
(33°F)		 4°C
(40°F)		 4°C
(39°F)		 10°C
(49°F)		 15°C
(59°F)		 21°C
(70°F)		 23°C
(74°F)		 23°C
(74°F)		 20°C
(69°F)		 12°C
(54°F)		 7°C
(44°F)		 3°C
(38°F)
Minimum -3°C
(28°F)		 1°C
(35°F)		 1°C
(35°F)		 7°C
(45°F)		 13°C
(55°F)		 19°C
(66°F)		 23°C
(73°F)		 23°C
(73°F)		 18°C
(64°F)		 8°C
(46°F)		 2°C
(36°F)		 -0°C
(32°F)

Compare climate in St. Marys with other places

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

Monthly average precipitation in St. Marys, Georgia, United States §

St. Marys usually has the most precipitation in July, August and September, with an average of 21 rainy days and 165 mm (6.5 inches) of precipitation per month.The driest months in St. Marys are January, March and April. On average, 54 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in St. Marys, Georgia, 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) 51 (2.0) 71 (2.8) 44 (1.7) 66 (2.6) 80 (3.2) 145 (5.7) 170 (6.7) 172 (6.8) 155 (6.1) 78 (3.1) 80 (3.1) 86 (3.4)
Average precipitation days (≥ 1 mm) 5 9 6 7 10 19 22 25 16 13 7 7

Monthly sunshine hours in St. Marys, Georgia, United States §

The sunniest months in St. Marys are May, July and August, when the sun shines an average of 10 hours 26 minutes a day.Least sunny months in St. Marys: January, February and December receive an average of 6 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in St. Marys, Georgia, 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 197 210 292 301 332 299 327 311 295 287 240 224
Mean daily daylight hours 10h 23m 11h 5m 12h 0m 12h 56m 13h 42m 14h 5m 13h 53m 13h 11m 12h 18m 11h 22m 10h 34m 10h 10m

Solar UV radiation in St. Marys, Georgia, United States §

St. Marys experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly St. Marys UV Index data.

Average daily maximum UV levels by month for St. Marys, Georgia, 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) 5 7 9 10 11 11 11 11 10 8 6 4