Mahaffey weather by month
What a typical year looks like in Mahaffey, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Grampian 1e, 16 km from Mahaffey; records cover 2004–2026.
The year at a glance
- Precipitation a year
- 48.3 in1228 mm
- Snow a year
- 63 in160 cm
- Last spring freeze
- May 14
- First fall freeze
- Oct 7
- Heating degree days
- 6,898
- Cooling degree days
- 390
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 89°32° (cooling, 1%).
Month by month
Mahaffey in January
Highs average 32°0° and lows 14°−10°, with 3.6 in92 mm of precipitation and 19 in48 cm of snow in a typical January.
- Record high
- 66°19° (2008)
- Record low
- −20°−29° (2009)
- Heating degree days
- 1297
- Cooling degree days
- 0
Mahaffey in February
Highs average 36°2° and lows 15°−9°, with 3.5 in88 mm of precipitation and 18 in46 cm of snow in a typical February.
- Record high
- 76°24° (2017)
- Record low
- −21°−29° (2015)
- Heating degree days
- 1102
- Cooling degree days
- 0
Mahaffey in March
Highs average 45°7° and lows 23°−5°, with 3.7 in94 mm of precipitation and 8 in21 cm of snow in a typical March.
- Record high
- 80°27° (2026)
- Record low
- −12°−24° (2015)
- Heating degree days
- 958
- Cooling degree days
- 0
Mahaffey in April
Highs average 59°15° and lows 33°1°, with 4.2 in107 mm of precipitation and 2.4 in6.1 cm of snow in a typical April.
- Record high
- 87°31° (2023)
- Record low
- 11°−12° (2016)
- Heating degree days
- 568
- Cooling degree days
- 1
Mahaffey in May
Highs average 69°20° and lows 45°7°, with 4.1 in103 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 91°33° (2006)
- Record low
- 24°−4° (2020)
- Heating degree days
- 268
- Cooling degree days
- 17
Mahaffey in June
Highs average 77°25° and lows 54°12°, with 5.2 in131 mm of precipitation in a typical June.
- Record high
- 93°34° (2022)
- Record low
- 32°0° (2009)
- Heating degree days
- 64
- Cooling degree days
- 67
Mahaffey in July
Highs average 81°27° and lows 58°14°, with 4.5 in115 mm of precipitation in a typical July.
- Record high
- 100°38° (2011)
- Record low
- 40°4° (2007)
- Heating degree days
- 18
- Cooling degree days
- 152
Mahaffey in August
Highs average 79°26° and lows 56°13°, with 4.1 in105 mm of precipitation in a typical August.
- Record high
- 93°34° (2005)
- Record low
- 39°4° (2025)
- Heating degree days
- 35
- Cooling degree days
- 111
Mahaffey in September
Highs average 72°22° and lows 49°9°, with 3.9 in100 mm of precipitation in a typical September.
- Record high
- 90°32° (2010)
- Record low
- 31°−1° (2013)
- Heating degree days
- 170
- Cooling degree days
- 39
Mahaffey in OctoberThis month
Highs average 61°16° and lows 38°3°, with 3.9 in98 mm of precipitation and 0.8 in2 cm of snow in a typical October.
- Record high
- 86°30° (2019)
- Record low
- 22°−6° (2012)
- Heating degree days
- 497
- Cooling degree days
- 3
Mahaffey in November
Highs average 48°9° and lows 28°−2°, with 3.5 in89 mm of precipitation and 2.9 in7.4 cm of snow in a typical November.
- Record high
- 77°25° (2024)
- Record low
- 6°−14° (2014)
- Heating degree days
- 802
- Cooling degree days
- 0
Mahaffey in December
Highs average 37°3° and lows 21°−6°, with 4.2 in107 mm of precipitation and 12 in30 cm of snow in a typical December.
- Record high
- 66°19° (2006)
- Record low
- −5°−21° (2017)
- Heating degree days
- 1119
- Cooling degree days
- 0