Waukesha weather in January: Waukesha, Wisconsin: normal highs, lows, rain and records for January
Waukesha in January has a normal high of 28°F and a normal low of 12°F, a daily mean of 20°F, falling from 29°F on the 1st to 28°F by the 31st. Measurable precipitation falls on 9 days in a normal January, 1.60 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of −2°C and low of −11°C, 41 mm of precipitation and 26 cm of snow in January.
- NOAA stationWaukesha Wastewater Treatment Plant
- Station IDUSC00478937
- Location43.01°N 88.25°W
- Elevation789 ft (241 m)
- Population71,461
- Jan 28° 12°
- Feb 32° 15°
- Mar 43° 24°
- Apr 55° 35°
- May 67° 46°
- Jun 77° 56°
- Jul 81° 60°
- Aug 80° 59°
- Sep 73° 51°
- Oct 60° 40°
- Nov 45° 28°
- Dec 33° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Waukesha in January?
The normal high is 28°F and the normal low 12°F, for a daily mean of 19.7°F. January is 5.8°F cooler than December and 3.3°F cooler than February. January is the 12th warmest month of the year in Waukesha and the 12th wettest, and the snowiest. Across the month the normal high falls 1°F, from 29°F on January 1 to 28°F on January 31. From one year to the next January's mean temperature typically moves about 4.9°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 15°F and 25°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 29°F | 14°F | 29% | 15% |
| January 8 | 28°F | 13°F | 30% | 16% |
| January 15 | 27°F | 11°F | 30% | 16% |
| January 22 | 27°F | 11°F | 30% | 16% |
| January 31 | 28°F | 11°F | 29% | 15% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 1, coldest night January 23)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 29°F | 14°F | 29% | 15% | 9 h |
| January 2 | 29°F | 14°F | 30% | 15% | 9 h |
| January 3 | 29°F | 14°F | 30% | 15% | 9 h 10 min |
| January 4 | 29°F | 13°F | 30% | 16% | 9 h 10 min |
| January 5 | 29°F | 13°F | 30% | 16% | 9 h 10 min |
| January 6 | 29°F | 13°F | 30% | 16% | 9 h 10 min |
| January 7 | 28°F | 13°F | 30% | 16% | 9 h 10 min |
| January 8 | 28°F | 13°F | 30% | 16% | 9 h 10 min |
| January 9 | 28°F | 12°F | 30% | 16% | 9 h 10 min |
| January 10 | 28°F | 12°F | 30% | 16% | 9 h 10 min |
| January 11 | 28°F | 12°F | 30% | 16% | 9 h 10 min |
| January 12 | 28°F | 12°F | 30% | 16% | 9 h 20 min |
| January 13 | 28°F | 12°F | 30% | 16% | 9 h 20 min |
| January 14 | 28°F | 11°F | 30% | 16% | 9 h 20 min |
| January 15 | 27°F | 11°F | 30% | 16% | 9 h 20 min |
| January 16 | 27°F | 11°F | 30% | 16% | 9 h 20 min |
| January 17 | 27°F | 11°F | 30% | 16% | 9 h 20 min |
| January 18 | 27°F | 11°F | 30% | 16% | 9 h 30 min |
| January 19 | 27°F | 11°F | 30% | 16% | 9 h 30 min |
| January 20 | 27°F | 11°F | 30% | 16% | 9 h 30 min |
| January 21 | 27°F | 11°F | 30% | 16% | 9 h 30 min |
| January 22 | 27°F | 11°F | 30% | 16% | 9 h 30 min |
| January 23 | 27°F | 11°F | 30% | 16% | 9 h 30 min |
| January 24 | 27°F | 11°F | 30% | 16% | 9 h 40 min |
| January 25 | 27°F | 11°F | 29% | 16% | 9 h 40 min |
| January 26 | 27°F | 11°F | 29% | 15% | 9 h 40 min |
| January 27 | 27°F | 11°F | 29% | 15% | 9 h 40 min |
| January 28 | 27°F | 11°F | 29% | 15% | 9 h 50 min |
| January 29 | 27°F | 11°F | 29% | 15% | 9 h 50 min |
| January 30 | 27°F | 11°F | 29% | 15% | 9 h 50 min |
| January 31 | 28°F | 11°F | 29% | 15% | 9 h 50 min |
- Normal high
- 28°FJanuary average
- Normal low
- 12°FJanuary average
- Precipitation
- 1.60 inmonth total
- Days with precipitation
- 90.01 inch or more
- Snowfall
- 10.4 inmonth total
- Nights at 32°F or colder
- 30
- Daylight
- 9 h to 9 h 50 minJanuary 1 to January 31
- Sunshine
- 63%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00478937; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Waukesha in January?
On a given January day the chance of 0.01 inch or more is 30% on average, highest around January 10 (30%). In all, 1.60 in falls on 9 days of a normal January.
In a normal January in Waukesha, 30 nights fall to freezing, 20 days stay below freezing all day and snowfall averages 10.4 inches.
Snow falls on 7 days in a normal January, and an inch or more covers the ground on 20 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00478937.
What are the records for January in Waukesha?
The warmest January temperature on this station's record (since 1894) is 62°F, on January 26, 1944; the coldest is −27°F, on January 25, 1904. The wettest January brought 5.60 in (1918); the snowiest, 56.0 inches (1918).
The January mean against the 1991-2020 normal of 19.7°F: 2025 17.5°F (−2.2), 2026 15.6°F (−4.1). 0 of 2 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2025 | 17.5°F | −2.2°F | 0.06 in |
| 2026 | 15.6°F | −4.1°F | 1.85 in |
Source: records: ACIS, station USC00478937; recent months: ACIS, station USC00478937. Records and recent months use complete months only.
How does January in Waukesha compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, January normal highs run from 19°F in Cumberland to 31°F in Kenosha; Waukesha's is 28°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.