St. Marys weather by month
What a typical year looks like in St. Marys, Georgia: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at FERNANDINA BEACH, 16 km from St. Marys; records cover 1892–2026.
The year at a glance
- Precipitation a year
- 49.9 in1268 mm
- Snow a year
- Rare
- Last spring freeze
- Feb 6
- First fall freeze
- Dec 18
- Heating degree days
- 1,065
- Cooling degree days
- 2,918
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 31°−1° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
St. Marys in January
Highs average 64°18° and lows 45°7°, with 3.2 in81 mm of precipitation in a typical January.
- Record high
- 89°32° (1916)
- Record low
- 4°−16° (1985)
- Heating degree days
- 326
- Cooling degree days
- 11
St. Marys in February
Highs average 67°19° and lows 49°9°, with 3.1 in80 mm of precipitation in a typical February.
- Record high
- 91°33° (1962)
- Record low
- 17°−8° (1895)
- Heating degree days
- 225
- Cooling degree days
- 18
St. Marys in March
Highs average 72°22° and lows 54°12°, with 3.3 in83 mm of precipitation in a typical March.
- Record high
- 95°35° (1907)
- Record low
- 22°−6° (1980)
- Heating degree days
- 121
- Cooling degree days
- 64
St. Marys in April
Highs average 77°25° and lows 60°15°, with 3 in77 mm of precipitation in a typical April.
- Record high
- 94°34° (1914)
- Record low
- 35°2° (1940)
- Heating degree days
- 32
- Cooling degree days
- 140
St. Marys in May
Highs average 84°29° and lows 68°20°, with 2.7 in68 mm of precipitation in a typical May.
- Record high
- 101°38° (1927)
- Record low
- 40°4° (1982)
- Heating degree days
- 2
- Cooling degree days
- 337
St. Marys in June
Highs average 88°31° and lows 73°23°, with 6.1 in155 mm of precipitation in a typical June.
- Record high
- 104°40° (1950)
- Record low
- 51°11° (1977)
- Heating degree days
- 0
- Cooling degree days
- 471
St. Marys in July
Highs average 91°33° and lows 75°24°, with 5 in126 mm of precipitation in a typical July.
- Record high
- 103°39° (1940)
- Record low
- 53°12° (2020)
- Heating degree days
- 0
- Cooling degree days
- 552
St. Marys in August
Highs average 90°32° and lows 75°24°, with 6.4 in162 mm of precipitation in a typical August.
- Record high
- 102°39° (1938)
- Record low
- 61°16° (1982)
- Heating degree days
- 0
- Cooling degree days
- 533
St. Marys in September
Highs average 86°30° and lows 73°23°, with 7.2 in183 mm of precipitation in a typical September.
- Record high
- 102°39° (1944)
- Record low
- 49°9° (1982)
- Heating degree days
- 0
- Cooling degree days
- 438
St. Marys in OctoberThis month
Highs average 80°27° and lows 65°19°, with 5 in126 mm of precipitation in a typical October.
- Record high
- 96°36° (1941)
- Record low
- 33°1° (2019)
- Heating degree days
- 13
- Cooling degree days
- 251
St. Marys in November
Highs average 72°22° and lows 56°13°, with 1.9 in47 mm of precipitation in a typical November.
- Record high
- 93°34° (1961)
- Record low
- 24°−4° (1950)
- Heating degree days
- 98
- Cooling degree days
- 76
St. Marys in December
Highs average 66°19° and lows 49°10°, with 3.1 in79 mm of precipitation in a typical December.
- Record high
- 85°29° (1967)
- Record low
- 12°−11° (1983)
- Heating degree days
- 248
- Cooling degree days
- 27