Hartford weather by month
What a typical year looks like in Hartford, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at HARTFORD WWTP, 3 km from Hartford; records cover 1897–2026.
The year at a glance
- Precipitation a year
- 34.1 in866 mm
- Snow a year
- 36 in92 cm
- Last spring freeze
- May 5
- First fall freeze
- Oct 4
- Heating degree days
- 7,783
- Cooling degree days
- 435
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −12°−24° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Hartford in January
Highs average 26°−3° and lows 9°−13°, with 1.5 in39 mm of precipitation and 10 in25 cm of snow in a typical January.
- Record high
- 55°13° (1996)
- Record low
- −35°−37° (1979)
- Heating degree days
- 1482
- Cooling degree days
- 0
Hartford in February
Highs average 30°−1° and lows 11°−11°, with 1.3 in32 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 69°21° (2024)
- Record low
- −34°−37° (1959)
- Heating degree days
- 1242
- Cooling degree days
- 0
Hartford in March
Highs average 41°5° and lows 22°−6°, with 1.8 in45 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −23°−31° (1962)
- Heating degree days
- 1039
- Cooling degree days
- 0
Hartford in April
Highs average 54°12° and lows 33°1°, with 3.4 in87 mm of precipitation and 1.4 in3.6 cm of snow in a typical April.
- Record high
- 88°31° (1980)
- Record low
- 1°−17° (1982)
- Heating degree days
- 639
- Cooling degree days
- 2
Hartford in May
Highs average 67°19° and lows 44°7°, with 3.8 in97 mm of precipitation and 0.3 in0.8 cm of snow in a typical May.
- Record high
- 94°34° (1999)
- Record low
- 20°−7° (1978)
- Heating degree days
- 318
- Cooling degree days
- 23
Hartford in June
Highs average 77°25° and lows 54°12°, with 4.8 in121 mm of precipitation in a typical June.
- Record high
- 100°38° (1988)
- Record low
- 31°−1° (1988)
- Heating degree days
- 80
- Cooling degree days
- 95
Hartford in July
Highs average 80°27° and lows 58°15°, with 3.9 in99 mm of precipitation in a typical July.
- Record high
- 105°41° (1999)
- Record low
- 39°4° (1965)
- Heating degree days
- 26
- Cooling degree days
- 156
Hartford in August
Highs average 79°26° and lows 56°13°, with 3.7 in95 mm of precipitation in a typical August.
- Record high
- 101°38° (1988)
- Record low
- 36°2° (1986)
- Heating degree days
- 41
- Cooling degree days
- 115
Hartford in September
Highs average 72°22° and lows 48°9°, with 3.2 in82 mm of precipitation in a typical September.
- Record high
- 97°36° (1953)
- Record low
- 23°−5° (1976)
- Heating degree days
- 187
- Cooling degree days
- 40
Hartford in OctoberThis month
Highs average 59°15° and lows 37°3°, with 2.9 in74 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 89°32° (1982)
- Record low
- 9°−13° (1898)
- Heating degree days
- 534
- Cooling degree days
- 4
Hartford in November
Highs average 44°7° and lows 26°−3°, with 2.1 in52 mm of precipitation and 1.1 in2.8 cm of snow in a typical November.
- Record high
- 75°24° (1999)
- Record low
- −11°−24° (1976)
- Heating degree days
- 904
- Cooling degree days
- 0
Hartford in December
Highs average 31°0° and lows 15°−9°, with 1.7 in43 mm of precipitation and 10 in26 cm of snow in a typical December.
- Record high
- 65°18° (2001)
- Record low
- −29°−34° (1983)
- Heating degree days
- 1291
- Cooling degree days
- 0