Unionville weather by month
What a typical year looks like in Unionville, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Caro Wwtp, 20 km from Unionville; records cover 1928–2026.
The year at a glance
- Precipitation a year
- 34.3 in871 mm
- Snow a year
- 42 in106 cm
- Last spring freeze
- May 9
- First fall freeze
- Oct 7
- Heating degree days
- 7,121
- Cooling degree days
- 536
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 92°33° (cooling, 1%).
Month by month
Unionville in January
Highs average 29°−1° and lows 15°−10°, with 2.2 in55 mm of precipitation and 13 in33 cm of snow in a typical January.
- Record high
- 73°23° (1939)
- Record low
- −25°−32° (1976)
- Heating degree days
- 1333
- Cooling degree days
- 0
Unionville in February
Highs average 32°0° and lows 15°−10°, with 1.6 in41 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 72°22° (2024)
- Record low
- −30°−34° (1934)
- Heating degree days
- 1172
- Cooling degree days
- 0
Unionville in March
Highs average 42°5° and lows 23°−5°, with 1.9 in49 mm of precipitation and 6 in14 cm of snow in a typical March.
- Record high
- 87°31° (2012)
- Record low
- −20°−29° (1948)
- Heating degree days
- 1011
- Cooling degree days
- 0
Unionville in April
Highs average 55°13° and lows 34°1°, with 3.6 in91 mm of precipitation and 1 in2.5 cm of snow in a typical April.
- Record high
- 90°32° (1948)
- Record low
- 6°−14° (1965)
- Heating degree days
- 620
- Cooling degree days
- 2
Unionville in May
Highs average 68°20° and lows 45°7°, with 3.7 in94 mm of precipitation in a typical May.
- Record high
- 94°34° (1987)
- Record low
- 22°−6° (1967)
- Heating degree days
- 298
- Cooling degree days
- 31
Unionville in June
Highs average 78°26° and lows 55°13°, with 3.6 in91 mm of precipitation in a typical June.
- Record high
- 102°39° (1934)
- Record low
- 28°−2° (1949)
- Heating degree days
- 70
- Cooling degree days
- 111
Unionville in July
Highs average 82°28° and lows 60°15°, with 3.5 in88 mm of precipitation in a typical July.
- Record high
- 108°42° (1936)
- Record low
- 34°1° (1965)
- Heating degree days
- 16
- Cooling degree days
- 194
Unionville in August
Highs average 80°27° and lows 57°14°, with 3.3 in84 mm of precipitation in a typical August.
- Record high
- 101°38° (2001)
- Record low
- 32°0° (1976)
- Heating degree days
- 28
- Cooling degree days
- 141
Unionville in September
Highs average 73°23° and lows 50°10°, with 3.2 in82 mm of precipitation in a typical September.
- Record high
- 102°39° (1953)
- Record low
- 21°−6° (1942)
- Heating degree days
- 157
- Cooling degree days
- 52
Unionville in OctoberThis month
Highs average 60°15° and lows 40°4°, with 3.1 in79 mm of precipitation in a typical October.
- Record high
- 89°32° (2007)
- Record low
- 12°−11° (1976)
- Heating degree days
- 479
- Cooling degree days
- 5
Unionville in November
Highs average 46°8° and lows 31°−1°, with 2.5 in63 mm of precipitation and 2.3 in5.8 cm of snow in a typical November.
- Record high
- 80°27° (1950)
- Record low
- −2°−19° (1933)
- Heating degree days
- 801
- Cooling degree days
- 0
Unionville in December
Highs average 35°1° and lows 22°−5°, with 2.1 in54 mm of precipitation and 12 in30 cm of snow in a typical December.
- Record high
- 69°21° (2001)
- Record low
- −18°−28° (2000)
- Heating degree days
- 1136
- Cooling degree days
- 0