Mount Holly Springs weather by month
What a typical year looks like in Mount Holly Springs, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Carlisle Water Plant, 13 km from Mount Holly Springs; records cover 1873–2026.
The year at a glance
- Precipitation a year
- 48 in1220 mm
- Snow a year
- 28 in70 cm
- Last spring freeze
- Apr 17
- First fall freeze
- Oct 20
- Heating degree days
- 5,559
- Cooling degree days
- 825
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 5°−15° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Mount Holly Springs in January
Highs average 38°3° and lows 21°−6°, with 3.1 in78 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 68°20° (2008)
- Record low
- −12°−24° (1875)
- Heating degree days
- 1107
- Cooling degree days
- 0
Mount Holly Springs in February
Highs average 41°5° and lows 22°−6°, with 2.6 in66 mm of precipitation and 10 in24 cm of snow in a typical February.
- Record high
- 82°28° (2018)
- Record low
- −12°−24° (1875)
- Heating degree days
- 944
- Cooling degree days
- 0
Mount Holly Springs in March
Highs average 50°10° and lows 29°−2°, with 4.1 in103 mm of precipitation and 5 in12 cm of snow in a typical March.
- Record high
- 83°28° (2012)
- Record low
- 2°−17° (2015)
- Heating degree days
- 792
- Cooling degree days
- 0
Mount Holly Springs in April
Highs average 63°17° and lows 39°4°, with 3.8 in96 mm of precipitation and 0.2 in0.5 cm of snow in a typical April.
- Record high
- 93°34° (2009)
- Record low
- 22°−6° (2013)
- Heating degree days
- 438
- Cooling degree days
- 5
Mount Holly Springs in May
Highs average 73°23° and lows 49°9°, with 4.7 in120 mm of precipitation in a typical May.
- Record high
- 94°34° (2011)
- Record low
- 29°−2° (2018)
- Heating degree days
- 174
- Cooling degree days
- 40
Mount Holly Springs in June
Highs average 81°27° and lows 59°15°, with 4.4 in112 mm of precipitation in a typical June.
- Record high
- 100°38° (1874)
- Record low
- 41°5° (2025)
- Heating degree days
- 22
- Cooling degree days
- 166
Mount Holly Springs in July
Highs average 86°30° and lows 63°17°, with 5.5 in138 mm of precipitation in a typical July.
- Record high
- 103°39° (1876)
- Record low
- 38°3° (2026)
- Heating degree days
- 1
- Cooling degree days
- 280
Mount Holly Springs in August
Highs average 84°29° and lows 61°16°, with 4 in102 mm of precipitation in a typical August.
- Record high
- 100°38° (1874)
- Record low
- 44°7° (2025)
- Heating degree days
- 4
- Cooling degree days
- 230
Mount Holly Springs in September
Highs average 77°25° and lows 53°12°, with 5 in126 mm of precipitation in a typical September.
- Record high
- 96°36° (2010)
- Record low
- 32°0° (1875)
- Heating degree days
- 83
- Cooling degree days
- 92
Mount Holly Springs in OctoberThis month
Highs average 66°19° and lows 42°5°, with 4.3 in108 mm of precipitation and 0.5 in1.3 cm of snow in a typical October.
- Record high
- 92°33° (2007)
- Record low
- 17°−8° (1873)
- Heating degree days
- 362
- Cooling degree days
- 12
Mount Holly Springs in November
Highs average 54°12° and lows 32°0°, with 3.1 in80 mm of precipitation and 0.9 in2.3 cm of snow in a typical November.
- Record high
- 82°28° (2024)
- Record low
- 8°−13° (1875)
- Heating degree days
- 663
- Cooling degree days
- 0
Mount Holly Springs in December
Highs average 42°6° and lows 25°−4°, with 3.6 in91 mm of precipitation and 4 in10 cm of snow in a typical December.
- Record high
- 68°20° (1873)
- Record low
- 2°−17° (2022)
- Heating degree days
- 969
- Cooling degree days
- 0