South New Castle weather by month
What a typical year looks like in South New Castle, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Beaver Falls 1 NE, 24 km from South New Castle; records cover 2011–2026.
The year at a glance
- Precipitation a year
- 40.3 in1024 mm
- Snow a year
- Rare
- Last spring freeze
- May 1
- First fall freeze
- Oct 19
- Heating degree days
- 5,958
- Cooling degree days
- 655
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 0°−18° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
South New Castle in January
Highs average 36°2° and lows 19°−7°, with 3.1 in80 mm of precipitation in a typical January.
- Record high
- 67°19° (2013)
- Record low
- −11°−24° (2025)
- Heating degree days
- 1161
- Cooling degree days
- 0
South New Castle in February
Highs average 39°4° and lows 19°−7°, with 2.4 in61 mm of precipitation in a typical February.
- Record high
- 76°24° (2017)
- Record low
- −12°−24° (2015)
- Heating degree days
- 1006
- Cooling degree days
- 0
South New Castle in March
Highs average 48°9° and lows 27°−3°, with 3.1 in78 mm of precipitation in a typical March.
- Record high
- 80°27° (2026)
- Record low
- −1°−18° (2014)
- Heating degree days
- 851
- Cooling degree days
- 0
South New Castle in April
Highs average 62°16° and lows 37°3°, with 3.7 in93 mm of precipitation in a typical April.
- Record high
- 86°30° (2013)
- Record low
- 18°−8° (2013)
- Heating degree days
- 479
- Cooling degree days
- 2
South New Castle in May
Highs average 72°22° and lows 48°9°, with 3.8 in98 mm of precipitation in a typical May.
- Record high
- 94°34° (2012)
- Record low
- 28°−2° (2018)
- Heating degree days
- 200
- Cooling degree days
- 34
South New Castle in June
Highs average 79°26° and lows 56°14°, with 4.3 in108 mm of precipitation in a typical June.
- Record high
- 95°35° (2025)
- Record low
- 39°4° (2025)
- Heating degree days
- 34
- Cooling degree days
- 114
South New Castle in July
Highs average 83°28° and lows 61°16°, with 3.8 in97 mm of precipitation in a typical July.
- Record high
- 97°36° (2012)
- Record low
- 49°9° (2014)
- Heating degree days
- 6
- Cooling degree days
- 226
South New Castle in August
Highs average 82°28° and lows 60°15°, with 3.5 in89 mm of precipitation in a typical August.
- Record high
- 93°34° (2024)
- Record low
- 43°6° (2025)
- Heating degree days
- 10
- Cooling degree days
- 191
South New Castle in September
Highs average 76°24° and lows 53°12°, with 3.6 in92 mm of precipitation in a typical September.
- Record high
- 95°35° (2018)
- Record low
- 36°2° (2020)
- Heating degree days
- 100
- Cooling degree days
- 78
South New Castle in OctoberThis month
Highs average 64°18° and lows 42°5°, with 3.1 in78 mm of precipitation in a typical October.
- Record high
- 89°32° (2019)
- Record low
- 29°−2° (2011)
- Heating degree days
- 388
- Cooling degree days
- 10
South New Castle in November
Highs average 51°11° and lows 32°0°, with 3 in75 mm of precipitation in a typical November.
- Record high
- 79°26° (2022)
- Record low
- 13°−11° (2019)
- Heating degree days
- 713
- Cooling degree days
- 0
South New Castle in December
Highs average 40°5° and lows 25°−4°, with 3 in76 mm of precipitation in a typical December.
- Record high
- 69°21° (2013)
- Record low
- −5°−21° (2022)
- Heating degree days
- 1010
- Cooling degree days
- 0