Alto weather by month
What a typical year looks like in Alto, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Town Of Westford, 23 km from Alto; records cover 2006–2026.
The year at a glance
- Precipitation a year
- 37.8 in960 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 30
- First fall freeze
- Oct 12
- Heating degree days
- 7,601
- Cooling degree days
- 514
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 90°32° (cooling, 1%).
Month by month
Alto in January
Highs average 25°−4° and lows 8°−13°, with 1.6 in42 mm of precipitation in a typical January.
- Record high
- 56°13° (2025)
- Record low
- −35°−37° (2019)
- Heating degree days
- 1494
- Cooling degree days
- 0
Alto in February
Highs average 29°−2° and lows 11°−12°, with 1.7 in43 mm of precipitation in a typical February.
- Record high
- 70°21° (2024)
- Record low
- −35°−37° (2019)
- Heating degree days
- 1256
- Cooling degree days
- 0
Alto in March
Highs average 41°5° and lows 22°−5°, with 2.4 in62 mm of precipitation in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −15°−26° (2019)
- Heating degree days
- 1030
- Cooling degree days
- 1
Alto in April
Highs average 55°13° and lows 34°1°, with 3.8 in96 mm of precipitation in a typical April.
- Record high
- 86°30° (2007)
- Record low
- 10°−12° (2018)
- Heating degree days
- 610
- Cooling degree days
- 1
Alto in May
Highs average 68°20° and lows 47°8°, with 4.4 in112 mm of precipitation in a typical May.
- Record high
- 94°34° (2018)
- Record low
- 25°−4° (2020)
- Heating degree days
- 268
- Cooling degree days
- 28
Alto in June
Highs average 78°25° and lows 56°14°, with 5 in127 mm of precipitation in a typical June.
- Record high
- 94°34° (2009)
- Record low
- 39°4° (2019)
- Heating degree days
- 48
- Cooling degree days
- 108
Alto in July
Highs average 81°27° and lows 60°16°, with 4.1 in105 mm of precipitation in a typical July.
- Record high
- 101°38° (2012)
- Record low
- 48°9° (2009)
- Heating degree days
- 12
- Cooling degree days
- 184
Alto in August
Highs average 79°26° and lows 58°15°, with 3.8 in95 mm of precipitation in a typical August.
- Record high
- 95°35° (2006)
- Record low
- 40°4° (2009)
- Heating degree days
- 22
- Cooling degree days
- 141
Alto in September
Highs average 72°22° and lows 50°10°, with 3.6 in91 mm of precipitation in a typical September.
- Record high
- 94°34° (2013)
- Record low
- 32°0° (2007)
- Heating degree days
- 162
- Cooling degree days
- 47
Alto in OctoberThis month
Highs average 59°15° and lows 39°4°, with 3.1 in79 mm of precipitation in a typical October.
- Record high
- 87°31° (2007)
- Record low
- 20°−7° (2009)
- Heating degree days
- 509
- Cooling degree days
- 4
Alto in November
Highs average 44°7° and lows 27°−3°, with 2.3 in59 mm of precipitation in a typical November.
- Record high
- 74°23° (2020)
- Record low
- 1°−17° (2014)
- Heating degree days
- 891
- Cooling degree days
- 0
Alto in December
Highs average 31°0° and lows 15°−9°, with 2 in50 mm of precipitation in a typical December.
- Record high
- 64°18° (2021)
- Record low
- −21°−29° (2013)
- Heating degree days
- 1299
- Cooling degree days
- 0