Union City weather by month
What a typical year looks like in Union City, Pennsylvania: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Union City Filtration Plant, 2 km from Union City; records cover 2012–2026.
The year at a glance
- Precipitation a year
- 49 in1245 mm
- Snow a year
- 114 in290 cm
- Last spring freeze
- May 16
- First fall freeze
- Oct 13
- Heating degree days
- 6,901
- Cooling degree days
- 421
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −8°−22° (heating, 99%) and 88°31° (cooling, 1%).
Month by month
Union City in January
Highs average 32°0° and lows 16°−9°, with 4.1 in103 mm of precipitation and 30 in77 cm of snow in a typical January.
- Record high
- 65°18° (2020)
- Record low
- −21°−29° (2026)
- Heating degree days
- 1261
- Cooling degree days
- 0
Union City in February
Highs average 35°1° and lows 15°−9°, with 2.9 in74 mm of precipitation and 21 in54 cm of snow in a typical February.
- Record high
- 73°23° (2017)
- Record low
- −22°−30° (2015)
- Heating degree days
- 1127
- Cooling degree days
- 0
Union City in March
Highs average 43°6° and lows 23°−5°, with 3.6 in92 mm of precipitation and 16 in40 cm of snow in a typical March.
- Record high
- 76°24° (2025)
- Record low
- −12°−24° (2015)
- Heating degree days
- 989
- Cooling degree days
- 0
Union City in April
Highs average 56°14° and lows 34°1°, with 4.2 in106 mm of precipitation and 4 in10 cm of snow in a typical April.
- Record high
- 84°29° (2022)
- Record low
- 13°−11° (2016)
- Heating degree days
- 598
- Cooling degree days
- 1
Union City in May
Highs average 68°20° and lows 45°7°, with 4.4 in111 mm of precipitation in a typical May.
- Record high
- 90°32° (2020)
- Record low
- 26°−3° (2020)
- Heating degree days
- 290
- Cooling degree days
- 23
Union City in June
Highs average 76°24° and lows 54°12°, with 4.5 in114 mm of precipitation in a typical June.
- Record high
- 92°33° (2022)
- Record low
- 32°0° (2025)
- Heating degree days
- 75
- Cooling degree days
- 74
Union City in July
Highs average 80°27° and lows 58°15°, with 4.7 in120 mm of precipitation in a typical July.
- Record high
- 92°33° (2026)
- Record low
- 42°6° (2026)
- Heating degree days
- 24
- Cooling degree days
- 153
Union City in August
Highs average 79°26° and lows 57°14°, with 3.7 in94 mm of precipitation in a typical August.
- Record high
- 90°32° (2021)
- Record low
- 39°4° (2025)
- Heating degree days
- 40
- Cooling degree days
- 120
Union City in September
Highs average 73°23° and lows 49°10°, with 4.4 in111 mm of precipitation in a typical September.
- Record high
- 90°32° (2018)
- Record low
- 31°−1° (2020)
- Heating degree days
- 166
- Cooling degree days
- 46
Union City in OctoberThis month
Highs average 61°16° and lows 38°4°, with 4.5 in115 mm of precipitation and 0.9 in2.3 cm of snow in a typical October.
- Record high
- 86°30° (2019)
- Record low
- 25°−4° (2025)
- Heating degree days
- 478
- Cooling degree days
- 4
Union City in November
Highs average 48°9° and lows 31°−1°, with 3.9 in98 mm of precipitation and 15 in37 cm of snow in a typical November.
- Record high
- 78°26° (2020)
- Record low
- 5°−15° (2014)
- Heating degree days
- 765
- Cooling degree days
- 0
Union City in December
Highs average 37°3° and lows 23°−5°, with 4.2 in107 mm of precipitation and 28 in70 cm of snow in a typical December.
- Record high
- 63°17° (2013)
- Record low
- −5°−21° (2022)
- Heating degree days
- 1088
- Cooling degree days
- 0