Coatesville weather by month
What a typical year looks like in Coatesville, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at New Holland 2 SE, 24 km from Coatesville; records cover 1992–2026.
The year at a glance
- Precipitation a year
- 46.8 in1190 mm
- Snow a year
- 34 in85 cm
- Last spring freeze
- Apr 11
- First fall freeze
- Oct 29
- Heating degree days
- 5,067
- Cooling degree days
- 1,084
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 8°−13° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Coatesville in January
Highs average 39°4° and lows 24°−5°, with 3.3 in85 mm of precipitation and 10 in26 cm of snow in a typical January.
- Record high
- 70°21° (2002)
- Record low
- −13°−25° (1994)
- Heating degree days
- 1051
- Cooling degree days
- 0
Coatesville in February
Highs average 42°5° and lows 25°−4°, with 2.8 in71 mm of precipitation and 11 in27 cm of snow in a typical February.
- Record high
- 80°27° (2018)
- Record low
- −2°−19° (1996)
- Heating degree days
- 892
- Cooling degree days
- 0
Coatesville in March
Highs average 51°10° and lows 32°0°, with 4.1 in104 mm of precipitation and 6 in14 cm of snow in a typical March.
- Record high
- 87°31° (1998)
- Record low
- 2°−17° (2015)
- Heating degree days
- 739
- Cooling degree days
- 1
Coatesville in April
Highs average 63°17° and lows 42°6°, with 3.6 in90 mm of precipitation and 1.2 in3 cm of snow in a typical April.
- Record high
- 93°34° (2002)
- Record low
- 20°−7° (1995)
- Heating degree days
- 382
- Cooling degree days
- 13
Coatesville in May
Highs average 73°23° and lows 53°12°, with 3.5 in89 mm of precipitation in a typical May.
- Record high
- 95°35° (1996)
- Record low
- 28°−2° (2020)
- Heating degree days
- 137
- Cooling degree days
- 69
Coatesville in June
Highs average 81°27° and lows 62°17°, with 4.5 in114 mm of precipitation in a typical June.
- Record high
- 98°37° (2024)
- Record low
- 40°4° (2020)
- Heating degree days
- 17
- Cooling degree days
- 213
Coatesville in July
Highs average 86°30° and lows 66°19°, with 4.4 in113 mm of precipitation in a typical July.
- Record high
- 105°41° (2026)
- Record low
- 50°10° (2021)
- Heating degree days
- 0
- Cooling degree days
- 344
Coatesville in August
Highs average 84°29° and lows 65°18°, with 4.3 in108 mm of precipitation in a typical August.
- Record high
- 101°38° (2001)
- Record low
- 44°7° (2024)
- Heating degree days
- 2
- Cooling degree days
- 298
Coatesville in September
Highs average 77°25° and lows 58°14°, with 4.9 in124 mm of precipitation in a typical September.
- Record high
- 96°36° (2023)
- Record low
- 34°1° (2020)
- Heating degree days
- 55
- Cooling degree days
- 127
Coatesville in OctoberThis month
Highs average 65°18° and lows 47°8°, with 4.6 in116 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 93°34° (2019)
- Record low
- 27°−3° (1992)
- Heating degree days
- 294
- Cooling degree days
- 19
Coatesville in November
Highs average 54°12° and lows 37°3°, with 3.2 in81 mm of precipitation and 1 in2.5 cm of snow in a typical November.
- Record high
- 82°28° (2024)
- Record low
- 13°−11° (2018)
- Heating degree days
- 599
- Cooling degree days
- 0
Coatesville in December
Highs average 43°6° and lows 29°−2°, with 3.7 in94 mm of precipitation and 5 in12 cm of snow in a typical December.
- Record high
- 75°24° (1998)
- Record low
- 2°−17° (2017)
- Heating degree days
- 899
- Cooling degree days
- 0