Thornburg weather by month
What a typical year looks like in Thornburg, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Pittsburgh International Airport, 12 km from Thornburg; records cover 1875–2026.
The year at a glance
- Precipitation a year
- 39.6 in1006 mm
- Snow a year
- 44 in112 cm
- Last spring freeze
- Apr 26
- First fall freeze
- Oct 19
- Heating degree days
- 5,571
- Cooling degree days
- 797
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 3°−16° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Thornburg in January
Highs average 36°2° and lows 21°−6°, with 3 in75 mm of precipitation and 13 in34 cm of snow in a typical January.
- Record high
- 75°24° (1906)
- Record low
- −22°−30° (1994)
- Heating degree days
- 1120
- Cooling degree days
- 0
Thornburg in February
Highs average 40°4° and lows 23°−5°, with 2.6 in67 mm of precipitation and 12 in30 cm of snow in a typical February.
- Record high
- 78°26° (2018)
- Record low
- −20°−29° (1899)
- Heating degree days
- 941
- Cooling degree days
- 0
Thornburg in March
Highs average 49°10° and lows 30°−1°, with 3.2 in80 mm of precipitation and 8 in19 cm of snow in a typical March.
- Record high
- 84°29° (1929)
- Record low
- −5°−21° (2015)
- Heating degree days
- 785
- Cooling degree days
- 1
Thornburg in April
Highs average 62°17° and lows 41°5°, with 3.3 in84 mm of precipitation and 1 in2.5 cm of snow in a typical April.
- Record high
- 90°32° (1896)
- Record low
- 11°−12° (1923)
- Heating degree days
- 413
- Cooling degree days
- 9
Thornburg in May
Highs average 72°22° and lows 51°10°, with 3.8 in97 mm of precipitation in a typical May.
- Record high
- 95°35° (1875)
- Record low
- 26°−3° (1963)
- Heating degree days
- 172
- Cooling degree days
- 56
Thornburg in June
Highs average 79°26° and lows 59°15°, with 4.1 in105 mm of precipitation in a typical June.
- Record high
- 98°37° (1895)
- Record low
- 34°1° (1972)
- Heating degree days
- 30
- Cooling degree days
- 160
Thornburg in July
Highs average 83°28° and lows 63°17°, with 4.3 in108 mm of precipitation in a typical July.
- Record high
- 103°39° (1881)
- Record low
- 42°6° (1963)
- Heating degree days
- 3
- Cooling degree days
- 256
Thornburg in August
Highs average 82°28° and lows 62°17°, with 3.5 in89 mm of precipitation in a typical August.
- Record high
- 103°39° (1918)
- Record low
- 39°4° (1982)
- Heating degree days
- 7
- Cooling degree days
- 219
Thornburg in September
Highs average 75°24° and lows 55°13°, with 3.3 in84 mm of precipitation in a typical September.
- Record high
- 102°39° (1881)
- Record low
- 31°−1° (1959)
- Heating degree days
- 86
- Cooling degree days
- 85
Thornburg in OctoberThis month
Highs average 63°17° and lows 44°7°, with 2.8 in72 mm of precipitation and 0.4 in1 cm of snow in a typical October.
- Record high
- 91°33° (1879)
- Record low
- 16°−9° (1965)
- Heating degree days
- 370
- Cooling degree days
- 11
Thornburg in November
Highs average 51°11° and lows 34°1°, with 2.9 in73 mm of precipitation and 2.4 in6.1 cm of snow in a typical November.
- Record high
- 82°28° (1961)
- Record low
- −1°−18° (1958)
- Heating degree days
- 672
- Cooling degree days
- 0
Thornburg in December
Highs average 41°5° and lows 27°−3°, with 2.8 in72 mm of precipitation and 8 in20 cm of snow in a typical December.
- Record high
- 74°23° (1982)
- Record low
- −12°−24° (1983)
- Heating degree days
- 972
- Cooling degree days
- 0