Unionville weather by month
What a typical year looks like in Unionville, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Wilmington Porter Res, 21 km from Unionville; records cover 1932–2026.
The year at a glance
- Precipitation a year
- 50.3 in1278 mm
- Snow a year
- 12 in30 cm
- Last spring freeze
- Apr 6
- First fall freeze
- Nov 8
- Heating degree days
- 5,180
- Cooling degree days
- 977
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 11°−12° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Unionville in January
Highs average 38°3° and lows 24°−5°, with 3.7 in93 mm of precipitation and 5 in13 cm of snow in a typical January.
- Record high
- 74°23° (1950)
- Record low
- −9°−23° (1982)
- Heating degree days
- 1058
- Cooling degree days
- 0
Unionville in February
Highs average 41°5° and lows 25°−4°, with 3 in77 mm of precipitation and 4 in10 cm of snow in a typical February.
- Record high
- 74°23° (1985)
- Record low
- −15°−26° (1934)
- Heating degree days
- 894
- Cooling degree days
- 0
Unionville in March
Highs average 49°10° and lows 32°0°, with 4.7 in118 mm of precipitation and 1.8 in4.6 cm of snow in a typical March.
- Record high
- 87°31° (1998)
- Record low
- 5°−15° (1943)
- Heating degree days
- 752
- Cooling degree days
- 0
Unionville in April
Highs average 61°16° and lows 43°6°, with 4.1 in103 mm of precipitation in a typical April.
- Record high
- 94°34° (1985)
- Record low
- 19°−7° (1982)
- Heating degree days
- 404
- Cooling degree days
- 8
Unionville in May
Highs average 71°21° and lows 52°11°, with 3.8 in96 mm of precipitation in a typical May.
- Record high
- 94°34° (1941)
- Record low
- 25°−4° (2008)
- Heating degree days
- 159
- Cooling degree days
- 50
Unionville in June
Highs average 79°26° and lows 62°17°, with 4.7 in120 mm of precipitation in a typical June.
- Record high
- 98°37° (1952)
- Record low
- 40°4° (1945)
- Heating degree days
- 22
- Cooling degree days
- 190
Unionville in July
Highs average 84°29° and lows 67°20°, with 5.2 in131 mm of precipitation in a typical July.
- Record high
- 103°39° (1936)
- Record low
- 50°10° (1933)
- Heating degree days
- 0
- Cooling degree days
- 329
Unionville in August
Highs average 82°28° and lows 66°19°, with 4.4 in112 mm of precipitation in a typical August.
- Record high
- 100°38° (2001)
- Record low
- 43°6° (1982)
- Heating degree days
- 2
- Cooling degree days
- 275
Unionville in September
Highs average 75°24° and lows 59°15°, with 5.1 in130 mm of precipitation in a typical September.
- Record high
- 97°36° (1932)
- Record low
- 32°0° (1940)
- Heating degree days
- 58
- Cooling degree days
- 112
Unionville in OctoberThis month
Highs average 63°17° and lows 47°8°, with 4.1 in105 mm of precipitation in a typical October.
- Record high
- 94°34° (1941)
- Record low
- 23°−5° (1936)
- Heating degree days
- 318
- Cooling degree days
- 13
Unionville in November
Highs average 53°11° and lows 37°3°, with 3.3 in83 mm of precipitation and 0.1 in0.3 cm of snow in a typical November.
- Record high
- 84°29° (1950)
- Record low
- 12°−11° (1938)
- Heating degree days
- 611
- Cooling degree days
- 0
Unionville in December
Highs average 43°6° and lows 29°−2°, with 4.4 in111 mm of precipitation and 0.8 in2 cm of snow in a typical December.
- Record high
- 73°23° (1984)
- Record low
- −1°−18° (1933)
- Heating degree days
- 902
- Cooling degree days
- 0