Castanea weather by month
What a typical year looks like in Castanea, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Lock Haven Sewage Plant, 2 km from Castanea; records cover 1973–2026.
The year at a glance
- Precipitation a year
- 41.7 in1060 mm
- Snow a year
- 30 in75 cm
- Last spring freeze
- Apr 29
- First fall freeze
- Oct 17
- Heating degree days
- 6,068
- Cooling degree days
- 729
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 94°34° (cooling, 1%).
Month by month
Castanea in January
Highs average 35°2° and lows 18°−8°, with 2.8 in70 mm of precipitation and 8 in19 cm of snow in a typical January.
- Record high
- 67°19° (2002)
- Record low
- −19°−28° (1982)
- Heating degree days
- 1190
- Cooling degree days
- 0
Castanea in February
Highs average 38°3° and lows 19°−7°, with 2.2 in55 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 78°26° (2017)
- Record low
- −12°−24° (2015)
- Heating degree days
- 1019
- Cooling degree days
- 0
Castanea in March
Highs average 48°9° and lows 27°−3°, with 3.1 in80 mm of precipitation and 6 in16 cm of snow in a typical March.
- Record high
- 87°31° (1998)
- Record low
- −4°−20° (2014)
- Heating degree days
- 864
- Cooling degree days
- 0
Castanea in April
Highs average 62°17° and lows 36°2°, with 3.6 in90 mm of precipitation and 0.6 in1.5 cm of snow in a typical April.
- Record high
- 93°34° (2009)
- Record low
- 12°−11° (1982)
- Heating degree days
- 482
- Cooling degree days
- 5
Castanea in May
Highs average 73°23° and lows 47°8°, with 4 in102 mm of precipitation in a typical May.
- Record high
- 95°35° (1996)
- Record low
- 27°−3° (1980)
- Heating degree days
- 199
- Cooling degree days
- 44
Castanea in June
Highs average 80°27° and lows 57°14°, with 3.8 in98 mm of precipitation in a typical June.
- Record high
- 98°37° (1988)
- Record low
- 34°1° (1980)
- Heating degree days
- 36
- Cooling degree days
- 141
Castanea in July
Highs average 85°29° and lows 61°16°, with 4.1 in104 mm of precipitation in a typical July.
- Record high
- 105°41° (2011)
- Record low
- 43°6° (1986)
- Heating degree days
- 3
- Cooling degree days
- 251
Castanea in August
Highs average 83°28° and lows 60°15°, with 4.2 in106 mm of precipitation in a typical August.
- Record high
- 100°38° (1988)
- Record low
- 34°1° (1986)
- Heating degree days
- 8
- Cooling degree days
- 205
Castanea in September
Highs average 76°24° and lows 53°11°, with 4.3 in108 mm of precipitation in a typical September.
- Record high
- 100°38° (1973)
- Record low
- 30°−1° (1983)
- Heating degree days
- 99
- Cooling degree days
- 75
Castanea in OctoberThis month
Highs average 64°18° and lows 41°5°, with 3.8 in96 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 91°33° (2007)
- Record low
- 21°−6° (1988)
- Heating degree days
- 410
- Cooling degree days
- 8
Castanea in November
Highs average 51°10° and lows 31°−1°, with 3 in75 mm of precipitation and 1.4 in3.6 cm of snow in a typical November.
- Record high
- 82°28° (1982)
- Record low
- 10°−12° (2008)
- Heating degree days
- 729
- Cooling degree days
- 0
Castanea in December
Highs average 40°4° and lows 24°−4°, with 3 in77 mm of precipitation and 6 in15 cm of snow in a typical December.
- Record high
- 76°24° (2001)
- Record low
- −9°−23° (1989)
- Heating degree days
- 1029
- Cooling degree days
- 0