Southport weather by month
What a typical year looks like in Southport, Connecticut: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Igor I Sikorsky Memorial Airport, 14 km from Southport; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 44.1 in1120 mm
- Snow a year
- 34 in85 cm
- Last spring freeze
- Apr 6
- First fall freeze
- Nov 7
- Heating degree days
- 5,140
- Cooling degree days
- 954
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 9°−13° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Southport in January
Highs average 38°4° and lows 24°−4°, with 3.2 in81 mm of precipitation and 9 in22 cm of snow in a typical January.
- Record high
- 69°21° (2020)
- Record low
- −7°−22° (1984)
- Heating degree days
- 1042
- Cooling degree days
- 0
Southport in February
Highs average 41°5° and lows 26°−4°, with 3.1 in79 mm of precipitation and 11 in27 cm of snow in a typical February.
- Record high
- 68°20° (2023)
- Record low
- −6°−21° (2016)
- Heating degree days
- 893
- Cooling degree days
- 0
Southport in March
Highs average 47°9° and lows 32°0°, with 4.1 in104 mm of precipitation and 7 in18 cm of snow in a typical March.
- Record high
- 84°29° (1990)
- Record low
- 4°−16° (1967)
- Heating degree days
- 780
- Cooling degree days
- 0
Southport in April
Highs average 58°15° and lows 42°5°, with 4.2 in106 mm of precipitation and 0.9 in2.3 cm of snow in a typical April.
- Record high
- 91°33° (1990)
- Record low
- 18°−8° (1982)
- Heating degree days
- 452
- Cooling degree days
- 2
Southport in May
Highs average 68°20° and lows 52°11°, with 3.6 in91 mm of precipitation in a typical May.
- Record high
- 97°36° (1996)
- Record low
- 31°−1° (1966)
- Heating degree days
- 182
- Cooling degree days
- 28
Southport in June
Highs average 78°25° and lows 62°16°, with 3.8 in96 mm of precipitation in a typical June.
- Record high
- 97°36° (2008)
- Record low
- 41°5° (1967)
- Heating degree days
- 25
- Cooling degree days
- 163
Southport in July
Highs average 83°29° and lows 68°20°, with 3.3 in84 mm of precipitation in a typical July.
- Record high
- 103°39° (1957)
- Record low
- 49°9° (1988)
- Heating degree days
- 0
- Cooling degree days
- 330
Southport in August
Highs average 82°28° and lows 67°19°, with 4 in101 mm of precipitation in a typical August.
- Record high
- 100°38° (1948)
- Record low
- 44°7° (1982)
- Heating degree days
- 1
- Cooling degree days
- 294
Southport in September
Highs average 75°24° and lows 60°15°, with 4 in101 mm of precipitation in a typical September.
- Record high
- 99°37° (1953)
- Record low
- 36°2° (1956)
- Heating degree days
- 45
- Cooling degree days
- 123
Southport in OctoberThis month
Highs average 64°18° and lows 48°9°, with 3.8 in98 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 89°32° (2007)
- Record low
- 26°−3° (1969)
- Heating degree days
- 282
- Cooling degree days
- 14
Southport in November
Highs average 54°12° and lows 38°4°, with 3.1 in79 mm of precipitation and 0.9 in2.3 cm of snow in a typical November.
- Record high
- 81°27° (2024)
- Record low
- 13°−11° (2018)
- Heating degree days
- 570
- Cooling degree days
- 0
Southport in December
Highs average 44°7° and lows 30°−1°, with 4 in101 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 76°24° (1998)
- Record low
- −4°−20° (1980)
- Heating degree days
- 868
- Cooling degree days
- 0