Lemont Furnace weather by month
What a typical year looks like in Lemont Furnace, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Connellsville 2 Ssw, 11 km from Lemont Furnace; records cover 1977–2026.
The year at a glance
- Precipitation a year
- 46.9 in1190 mm
- Snow a year
- 24 in62 cm
- Last spring freeze
- Apr 28
- First fall freeze
- Oct 19
- Heating degree days
- 5,532
- Cooling degree days
- 787
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 2°−17° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Lemont Furnace in January
Highs average 38°4° and lows 21°−6°, with 3.2 in82 mm of precipitation and 10 in24 cm of snow in a typical January.
- Record high
- 73°23° (2005)
- Record low
- −22°−30° (2026)
- Heating degree days
- 1100
- Cooling degree days
- 0
Lemont Furnace in February
Highs average 42°5° and lows 21°−6°, with 3 in77 mm of precipitation and 7 in19 cm of snow in a typical February.
- Record high
- 78°26° (2017)
- Record low
- −21°−29° (2026)
- Heating degree days
- 938
- Cooling degree days
- 0
Lemont Furnace in March
Highs average 51°10° and lows 28°−2°, with 3.6 in91 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 86°30° (2012)
- Record low
- −4°−20° (2015)
- Heating degree days
- 794
- Cooling degree days
- 1
Lemont Furnace in April
Highs average 64°18° and lows 38°3°, with 4.2 in107 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 89°32° (2009)
- Record low
- 15°−9° (2025)
- Heating degree days
- 436
- Cooling degree days
- 7
Lemont Furnace in May
Highs average 73°23° and lows 49°10°, with 4.7 in120 mm of precipitation in a typical May.
- Record high
- 93°34° (2000)
- Record low
- 27°−3° (2020)
- Heating degree days
- 178
- Cooling degree days
- 55
Lemont Furnace in June
Highs average 80°27° and lows 58°14°, with 4.9 in125 mm of precipitation in a typical June.
- Record high
- 99°37° (2024)
- Record low
- 36°2° (2025)
- Heating degree days
- 24
- Cooling degree days
- 141
Lemont Furnace in July
Highs average 84°29° and lows 62°17°, with 4.7 in120 mm of precipitation in a typical July.
- Record high
- 99°37° (2020)
- Record low
- 46°8° (2001)
- Heating degree days
- 3
- Cooling degree days
- 251
Lemont Furnace in August
Highs average 83°29° and lows 61°16°, with 4.4 in113 mm of precipitation in a typical August.
- Record high
- 98°37° (2005)
- Record low
- 45°7° (2024)
- Heating degree days
- 5
- Cooling degree days
- 223
Lemont Furnace in September
Highs average 77°25° and lows 54°12°, with 3.9 in100 mm of precipitation in a typical September.
- Record high
- 95°35° (2011)
- Record low
- 36°2° (2026)
- Heating degree days
- 82
- Cooling degree days
- 94
Lemont Furnace in OctoberThis month
Highs average 66°19° and lows 43°6°, with 3.4 in87 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 92°33° (2019)
- Record low
- 25°−4° (2025)
- Heating degree days
- 356
- Cooling degree days
- 15
Lemont Furnace in November
Highs average 53°12° and lows 32°0°, with 3.3 in84 mm of precipitation and 0.4 in1 cm of snow in a typical November.
- Record high
- 82°28° (2003)
- Record low
- 12°−11° (1977)
- Heating degree days
- 672
- Cooling degree days
- 0
Lemont Furnace in December
Highs average 43°6° and lows 26°−3°, with 3.3 in85 mm of precipitation and 4 in9 cm of snow in a typical December.
- Record high
- 75°24° (2001)
- Record low
- −6°−21° (2025)
- Heating degree days
- 944
- Cooling degree days
- 0