Horsham weather by month
What a typical year looks like in Horsham, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Northeast Philadelphia Airport, 16 km from Horsham; records cover 1945–2026.
The year at a glance
- Precipitation a year
- 45 in1143 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 6
- First fall freeze
- Nov 4
- Heating degree days
- 4,466
- Cooling degree days
- 1,374
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 11°−12° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Horsham in January
Highs average 42°5° and lows 27°−3°, with 3.3 in85 mm of precipitation in a typical January.
- Record high
- 73°23° (2007)
- Record low
- −6°−21° (1982)
- Heating degree days
- 955
- Cooling degree days
- 0
Horsham in February
Highs average 45°7° and lows 28°−2°, with 2.6 in65 mm of precipitation in a typical February.
- Record high
- 79°26° (2018)
- Record low
- −4°−20° (1979)
- Heating degree days
- 798
- Cooling degree days
- 0
Horsham in March
Highs average 53°12° and lows 35°2°, with 4 in101 mm of precipitation in a typical March.
- Record high
- 88°31° (1998)
- Record low
- 8°−13° (1967)
- Heating degree days
- 655
- Cooling degree days
- 1
Horsham in April
Highs average 65°18° and lows 44°7°, with 3.8 in96 mm of precipitation in a typical April.
- Record high
- 93°34° (1976)
- Record low
- 19°−7° (1982)
- Heating degree days
- 328
- Cooling degree days
- 19
Horsham in May
Highs average 75°24° and lows 54°12°, with 3.6 in92 mm of precipitation in a typical May.
- Record high
- 98°37° (2026)
- Record low
- 29°−2° (1978)
- Heating degree days
- 106
- Cooling degree days
- 84
Horsham in June
Highs average 83°29° and lows 64°18°, with 3.9 in98 mm of precipitation in a typical June.
- Record high
- 100°38° (2025)
- Record low
- 40°4° (1958)
- Heating degree days
- 10
- Cooling degree days
- 268
Horsham in July
Highs average 88°31° and lows 69°21°, with 4.3 in110 mm of precipitation in a typical July.
- Record high
- 105°41° (2011)
- Record low
- 49°9° (1957)
- Heating degree days
- 0
- Cooling degree days
- 428
Horsham in August
Highs average 86°30° and lows 68°20°, with 4.2 in107 mm of precipitation in a typical August.
- Record high
- 103°39° (2001)
- Record low
- 44°7° (1986)
- Heating degree days
- 0
- Cooling degree days
- 369
Horsham in September
Highs average 79°26° and lows 60°16°, with 4.5 in115 mm of precipitation in a typical September.
- Record high
- 99°37° (1983)
- Record low
- 34°1° (1957)
- Heating degree days
- 32
- Cooling degree days
- 176
Horsham in OctoberThis month
Highs average 68°20° and lows 48°9°, with 3.6 in92 mm of precipitation in a typical October.
- Record high
- 97°36° (2019)
- Record low
- 24°−4° (1966)
- Heating degree days
- 248
- Cooling degree days
- 28
Horsham in November
Highs average 57°14° and lows 38°4°, with 3.2 in81 mm of precipitation in a typical November.
- Record high
- 82°28° (2024)
- Record low
- 15°−9° (1976)
- Heating degree days
- 526
- Cooling degree days
- 1
Horsham in December
Highs average 47°8° and lows 31°0°, with 4 in102 mm of precipitation in a typical December.
- Record high
- 77°25° (1998)
- Record low
- −3°−19° (1980)
- Heating degree days
- 808
- Cooling degree days
- 0