Hanover weather by month
What a typical year looks like in Hanover, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Millers 4 NE, 19 km from Hanover; records cover 1988–2026.
The year at a glance
- Precipitation a year
- 47.9 in1216 mm
- Snow a year
- 34 in87 cm
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 22
- Heating degree days
- 5,032
- Cooling degree days
- 927
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 7°−14° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Hanover in January
Highs average 40°4° and lows 24°−5°, with 3.6 in91 mm of precipitation and 10 in25 cm of snow in a typical January.
- Record high
- 71°22° (2024)
- Record low
- −13°−25° (1994)
- Heating degree days
- 1035
- Cooling degree days
- 0
Hanover in February
Highs average 43°6° and lows 25°−4°, with 2.9 in75 mm of precipitation and 11 in27 cm of snow in a typical February.
- Record high
- 79°26° (2018)
- Record low
- −7°−22° (1996)
- Heating degree days
- 865
- Cooling degree days
- 0
Hanover in March
Highs average 52°11° and lows 32°0°, with 4.1 in105 mm of precipitation and 6 in16 cm of snow in a typical March.
- Record high
- 85°29° (1990)
- Record low
- 0°−18° (2007)
- Heating degree days
- 718
- Cooling degree days
- 1
Hanover in April
Highs average 65°18° and lows 42°5°, with 3.8 in98 mm of precipitation and 0.5 in1.3 cm of snow in a typical April.
- Record high
- 90°32° (2002)
- Record low
- 21°−6° (2013)
- Heating degree days
- 368
- Cooling degree days
- 13
Hanover in May
Highs average 73°23° and lows 51°11°, with 4 in101 mm of precipitation in a typical May.
- Record high
- 94°34° (2026)
- Record low
- 30°−1° (1996)
- Heating degree days
- 146
- Cooling degree days
- 61
Hanover in June
Highs average 81°27° and lows 60°16°, with 3.8 in97 mm of precipitation in a typical June.
- Record high
- 96°36° (2024)
- Record low
- 42°6° (2019)
- Heating degree days
- 20
- Cooling degree days
- 182
Hanover in July
Highs average 85°29° and lows 64°18°, with 4.7 in120 mm of precipitation in a typical July.
- Record high
- 102°39° (2011)
- Record low
- 47°8° (2001)
- Heating degree days
- 0
- Cooling degree days
- 300
Hanover in August
Highs average 83°28° and lows 63°17°, with 4.2 in106 mm of precipitation in a typical August.
- Record high
- 98°37° (1988)
- Record low
- 44°7° (2025)
- Heating degree days
- 4
- Cooling degree days
- 247
Hanover in September
Highs average 77°25° and lows 56°13°, with 5.1 in130 mm of precipitation in a typical September.
- Record high
- 96°36° (2023)
- Record low
- 35°2° (1989)
- Heating degree days
- 63
- Cooling degree days
- 108
Hanover in OctoberThis month
Highs average 65°19° and lows 45°7°, with 4.2 in106 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 91°33° (2019)
- Record low
- 24°−4° (1988)
- Heating degree days
- 312
- Cooling degree days
- 15
Hanover in November
Highs average 54°12° and lows 36°2°, with 3.4 in85 mm of precipitation and 1 in2.5 cm of snow in a typical November.
- Record high
- 82°28° (2003)
- Record low
- 14°−10° (1989)
- Heating degree days
- 603
- Cooling degree days
- 0
Hanover in December
Highs average 44°7° and lows 28°−2°, with 4 in103 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 75°24° (1998)
- Record low
- −1°−18° (1989)
- Heating degree days
- 898
- Cooling degree days
- 0