Green Harbor weather by month
What a typical year looks like in Green Harbor, Massachusetts: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Plymouth Municipal Airport, 19 km from Green Harbor; records cover 1996–2026.
The year at a glance
- Precipitation a year
- 48 in1219 mm
- Snow a year
- Rare
- Last spring freeze
- May 3
- First fall freeze
- Oct 15
- Heating degree days
- 6,018
- Cooling degree days
- 589
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 3°−16° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Green Harbor in January
Highs average 38°3° and lows 20°−6°, with 3.8 in97 mm of precipitation in a typical January.
- Record high
- 69°21° (2020)
- Record low
- −11°−24° (2005)
- Heating degree days
- 1111
- Cooling degree days
- 0
Green Harbor in February
Highs average 40°4° and lows 21°−6°, with 3 in75 mm of precipitation in a typical February.
- Record high
- 70°21° (2017)
- Record low
- −12°−24° (2015)
- Heating degree days
- 966
- Cooling degree days
- 0
Green Harbor in March
Highs average 46°8° and lows 27°−3°, with 5 in126 mm of precipitation in a typical March.
- Record high
- 80°27° (1998)
- Record low
- −4°−20° (2015)
- Heating degree days
- 876
- Cooling degree days
- 0
Green Harbor in April
Highs average 57°14° and lows 36°2°, with 4.4 in112 mm of precipitation in a typical April.
- Record high
- 92°33° (2002)
- Record low
- 13°−11° (2016)
- Heating degree days
- 567
- Cooling degree days
- 2
Green Harbor in May
Highs average 67°20° and lows 46°8°, with 3.5 in90 mm of precipitation in a typical May.
- Record high
- 93°34° (2010)
- Record low
- 26°−3° (2001)
- Heating degree days
- 281
- Cooling degree days
- 16
Green Harbor in June
Highs average 76°24° and lows 55°13°, with 3.8 in97 mm of precipitation in a typical June.
- Record high
- 100°38° (2025)
- Record low
- 34°1° (1997)
- Heating degree days
- 73
- Cooling degree days
- 92
Green Harbor in July
Highs average 82°28° and lows 62°17°, with 3.4 in85 mm of precipitation in a typical July.
- Record high
- 101°38° (2010)
- Record low
- 45°7° (2001)
- Heating degree days
- 9
- Cooling degree days
- 223
Green Harbor in August
Highs average 80°27° and lows 61°16°, with 3.5 in88 mm of precipitation in a typical August.
- Record high
- 99°37° (2006)
- Record low
- 46°8° (2000)
- Heating degree days
- 15
- Cooling degree days
- 187
Green Harbor in September
Highs average 73°23° and lows 53°12°, with 3.8 in97 mm of precipitation in a typical September.
- Record high
- 96°36° (2010)
- Record low
- 32°0° (2000)
- Heating degree days
- 117
- Cooling degree days
- 62
Green Harbor in OctoberThis month
Highs average 63°17° and lows 42°6°, with 4.8 in122 mm of precipitation in a typical October.
- Record high
- 86°30° (2011)
- Record low
- 18°−8° (1997)
- Heating degree days
- 396
- Cooling degree days
- 7
Green Harbor in November
Highs average 53°11° and lows 33°1°, with 4.5 in114 mm of precipitation in a typical November.
- Record high
- 79°26° (2022)
- Record low
- 9°−13° (2000)
- Heating degree days
- 665
- Cooling degree days
- 0
Green Harbor in December
Highs average 43°6° and lows 26°−3°, with 4.6 in117 mm of precipitation in a typical December.
- Record high
- 76°24° (1998)
- Record low
- 3°−16° (2000)
- Heating degree days
- 942
- Cooling degree days
- 0