Siasconset weather by month
What a typical year looks like in Siasconset, Massachusetts: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Nantucket Memorial Airport, 7 km from Siasconset; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 40.9 in1038 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 16
- First fall freeze
- Nov 8
- Heating degree days
- 5,537
- Cooling degree days
- 343
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 12°−11° (heating, 99%) and 83°28° (cooling, 1%).
Month by month
Siasconset in January
Highs average 40°4° and lows 27°−3°, with 3.2 in81 mm of precipitation in a typical January.
- Record high
- 63°17° (1967)
- Record low
- −3°−19° (2004)
- Heating degree days
- 990
- Cooling degree days
- 0
Siasconset in February
Highs average 40°5° and lows 27°−3°, with 2.8 in72 mm of precipitation in a typical February.
- Record high
- 61°16° (2023)
- Record low
- −3°−19° (2023)
- Heating degree days
- 881
- Cooling degree days
- 0
Siasconset in March
Highs average 44°7° and lows 32°0°, with 3.8 in98 mm of precipitation in a typical March.
- Record high
- 66°19° (2012)
- Record low
- 7°−14° (1950)
- Heating degree days
- 842
- Cooling degree days
- 0
Siasconset in April
Highs average 52°11° and lows 39°4°, with 3.6 in91 mm of precipitation in a typical April.
- Record high
- 83°28° (2009)
- Record low
- 20°−7° (1954)
- Heating degree days
- 585
- Cooling degree days
- 0
Siasconset in May
Highs average 61°16° and lows 47°8°, with 3 in76 mm of precipitation in a typical May.
- Record high
- 85°29° (2007)
- Record low
- 28°−2° (1972)
- Heating degree days
- 346
- Cooling degree days
- 0
Siasconset in June
Highs average 69°20° and lows 56°13°, with 3 in76 mm of precipitation in a typical June.
- Record high
- 92°33° (2012)
- Record low
- 35°2° (1976)
- Heating degree days
- 107
- Cooling degree days
- 23
Siasconset in July
Highs average 75°24° and lows 63°17°, with 2.7 in69 mm of precipitation in a typical July.
- Record high
- 92°33° (1964)
- Record low
- 47°8° (1972)
- Heating degree days
- 11
- Cooling degree days
- 135
Siasconset in August
Highs average 76°24° and lows 62°17°, with 3 in76 mm of precipitation in a typical August.
- Record high
- 100°38° (1975)
- Record low
- 39°4° (1965)
- Heating degree days
- 11
- Cooling degree days
- 137
Siasconset in September
Highs average 70°21° and lows 57°14°, with 3.6 in91 mm of precipitation in a typical September.
- Record high
- 86°30° (1971)
- Record low
- 34°1° (1973)
- Heating degree days
- 83
- Cooling degree days
- 44
Siasconset in OctoberThis month
Highs average 62°17° and lows 49°9°, with 4.4 in112 mm of precipitation in a typical October.
- Record high
- 83°28° (2011)
- Record low
- 22°−6° (1966)
- Heating degree days
- 306
- Cooling degree days
- 4
Siasconset in November
Highs average 53°12° and lows 40°4°, with 3.8 in96 mm of precipitation in a typical November.
- Record high
- 74°23° (1971)
- Record low
- 16°−9° (2000)
- Heating degree days
- 558
- Cooling degree days
- 0
Siasconset in December
Highs average 45°7° and lows 32°0°, with 3.9 in100 mm of precipitation in a typical December.
- Record high
- 66°19° (2015)
- Record low
- −3°−19° (1962)
- Heating degree days
- 817
- Cooling degree days
- 0