Petersham weather by month
What a typical year looks like in Petersham, Massachusetts: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Tully Lake, 17 km from Petersham; records cover 1949–2026.
The year at a glance
- Precipitation a year
- 47.4 in1205 mm
- Snow a year
- 52 in133 cm
- Last spring freeze
- May 3
- First fall freeze
- Oct 10
- Heating degree days
- 6,529
- Cooling degree days
- 767
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Petersham in January
Highs average 33°1° and lows 14°−10°, with 3.6 in90 mm of precipitation and 14 in36 cm of snow in a typical January.
- Record high
- 65°18° (2020)
- Record low
- −29°−34° (1957)
- Heating degree days
- 1285
- Cooling degree days
- 0
Petersham in February
Highs average 37°3° and lows 15°−9°, with 2.9 in75 mm of precipitation and 13 in32 cm of snow in a typical February.
- Record high
- 72°22° (2018)
- Record low
- −27°−33° (1958)
- Heating degree days
- 1098
- Cooling degree days
- 0
Petersham in March
Highs average 45°7° and lows 24°−5°, with 3.9 in99 mm of precipitation and 9 in24 cm of snow in a typical March.
- Record high
- 83°28° (1998)
- Record low
- −19°−28° (1967)
- Heating degree days
- 956
- Cooling degree days
- 0
Petersham in April
Highs average 59°15° and lows 36°2°, with 3.6 in90 mm of precipitation and 3 in8 cm of snow in a typical April.
- Record high
- 94°34° (1990)
- Record low
- 6°−14° (1965)
- Heating degree days
- 536
- Cooling degree days
- 4
Petersham in May
Highs average 71°22° and lows 47°8°, with 3.5 in89 mm of precipitation in a typical May.
- Record high
- 97°36° (2016)
- Record low
- 22°−6° (1956)
- Heating degree days
- 218
- Cooling degree days
- 38
Petersham in June
Highs average 80°26° and lows 57°14°, with 4.5 in114 mm of precipitation in a typical June.
- Record high
- 99°37° (2021)
- Record low
- 30°−1° (1958)
- Heating degree days
- 44
- Cooling degree days
- 144
Petersham in July
Highs average 85°30° and lows 62°17°, with 4.6 in117 mm of precipitation in a typical July.
- Record high
- 100°38° (1966)
- Record low
- 37°3° (1957)
- Heating degree days
- 4
- Cooling degree days
- 275
Petersham in August
Highs average 83°29° and lows 60°16°, with 4.3 in108 mm of precipitation in a typical August.
- Record high
- 99°37° (1955)
- Record low
- 30°−1° (1965)
- Heating degree days
- 11
- Cooling degree days
- 222
Petersham in September
Highs average 75°24° and lows 52°11°, with 4.3 in110 mm of precipitation in a typical September.
- Record high
- 100°38° (1953)
- Record low
- 22°−6° (1950)
- Heating degree days
- 115
- Cooling degree days
- 78
Petersham in OctoberThis month
Highs average 62°17° and lows 41°5°, with 4.7 in119 mm of precipitation in a typical October.
- Record high
- 87°31° (1963)
- Record low
- 16°−9° (1952)
- Heating degree days
- 432
- Cooling degree days
- 6
Petersham in November
Highs average 49°9° and lows 31°0°, with 3.6 in91 mm of precipitation and 1.2 in3 cm of snow in a typical November.
- Record high
- 80°27° (1950)
- Record low
- 0°−18° (1989)
- Heating degree days
- 744
- Cooling degree days
- 0
Petersham in December
Highs average 38°3° and lows 22°−6°, with 4.1 in103 mm of precipitation and 12 in30 cm of snow in a typical December.
- Record high
- 67°19° (2001)
- Record low
- −22°−30° (1980)
- Heating degree days
- 1086
- Cooling degree days
- 0