Waukesha weather in December: Waukesha, Wisconsin: normal highs, lows, rain and records for December
Waukesha in December has a normal high of 33°F and a normal low of 18°F, a daily mean of 26°F, falling from 38°F on the 1st to 30°F by the 31st. Measurable precipitation falls on 9 days in a normal December, 1.70 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 1°C and low of −8°C, 43 mm of precipitation and 22 cm of snow in December.
- 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 December?
The normal high is 33°F and the normal low 18°F, for a daily mean of 25.5°F. December is 11.2°F cooler than November and 5.8°F warmer than January. December is the 10th warmest month of the year in Waukesha and the 11th wettest. Across the month the normal high falls 8°F, from 38°F on December 1 to 30°F on December 31. From one year to the next December's mean temperature typically moves about 4.7°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 21°F and 30°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 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 38°F | 22°F | 32% | 17% |
| December 8 | 35°F | 20°F | 31% | 17% |
| December 15 | 33°F | 18°F | 30% | 16% |
| December 22 | 31°F | 17°F | 30% | 15% |
| December 31 | 30°F | 14°F | 29% | 15% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 38°F | 22°F | 32% | 17% | 9 h 20 min |
| December 2 | 37°F | 22°F | 32% | 17% | 9 h 10 min |
| December 3 | 37°F | 22°F | 32% | 17% | 9 h 10 min |
| December 4 | 36°F | 21°F | 32% | 17% | 9 h 10 min |
| December 5 | 36°F | 21°F | 32% | 17% | 9 h 10 min |
| December 6 | 36°F | 21°F | 31% | 17% | 9 h 10 min |
| December 7 | 35°F | 20°F | 31% | 17% | 9 h 10 min |
| December 8 | 35°F | 20°F | 31% | 17% | 9 h 10 min |
| December 9 | 35°F | 20°F | 31% | 17% | 9 h 10 min |
| December 10 | 34°F | 20°F | 31% | 16% | 9 h 10 min |
| December 11 | 34°F | 19°F | 31% | 16% | 9 h |
| December 12 | 34°F | 19°F | 31% | 16% | 9 h |
| December 13 | 34°F | 19°F | 31% | 16% | 9 h |
| December 14 | 33°F | 19°F | 31% | 16% | 9 h |
| December 15 | 33°F | 18°F | 30% | 16% | 9 h |
| December 16 | 33°F | 18°F | 30% | 16% | 9 h |
| December 17 | 33°F | 18°F | 30% | 16% | 9 h |
| December 18 | 32°F | 18°F | 30% | 16% | 9 h |
| December 19 | 32°F | 17°F | 30% | 16% | 9 h |
| December 20 | 32°F | 17°F | 30% | 16% | 9 h |
| December 21 | 32°F | 17°F | 30% | 15% | 9 h |
| December 22 | 31°F | 17°F | 30% | 15% | 9 h |
| December 23 | 31°F | 16°F | 30% | 15% | 9 h |
| December 24 | 31°F | 16°F | 30% | 15% | 9 h |
| December 25 | 31°F | 16°F | 29% | 15% | 9 h |
| December 26 | 31°F | 16°F | 29% | 15% | 9 h |
| December 27 | 30°F | 15°F | 29% | 15% | 9 h |
| December 28 | 30°F | 15°F | 29% | 15% | 9 h |
| December 29 | 30°F | 15°F | 29% | 15% | 9 h |
| December 30 | 30°F | 15°F | 29% | 15% | 9 h |
| December 31 | 30°F | 14°F | 29% | 15% | 9 h |
- Normal high
- 33°FDecember average
- Normal low
- 18°FDecember average
- Precipitation
- 1.70 inmonth total
- Days with precipitation
- 90.01 inch or more
- Snowfall
- 8.8 inmonth total
- Nights at 32°F or colder
- 28
- Daylight
- 9 h 20 min to 9 hDecember 1 to December 31
- Sunshine
- 59%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 December?
On a given December day the chance of 0.01 inch or more is 30% on average, highest around December 2 (32%). In all, 1.70 in falls on 9 days of a normal December.
In a normal December in Waukesha, 28 nights fall to freezing, 15 days stay below freezing all day and snowfall averages 8.8 inches.
Snow falls on 5 days in a normal December, and an inch or more covers the ground on 12 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00478937.
What are the records for December in Waukesha?
The warmest December temperature on this station's record (since 1894) is 68°F, on December 6, 2001; the coldest is −28°F, on December 19, 1945. The wettest December brought 5.15 in (2015); the snowiest, 34.4 inches (2008).
The December mean against the 1991-2020 normal of 25.5°F: 2024 27.6°F (+2.1), 2025 21.2°F (−4.3). 1 of 2 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2024 | 27.6°F | +2.1°F | 0.77 in |
| 2025 | 21.2°F | −4.3°F | 1.51 in |
Source: records: ACIS, station USC00478937; recent months: ACIS, station USC00478937. Records and recent months use complete months only.
How does December in Waukesha compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, December normal highs run from 24°F in Drummond to 37°F in Kenosha; Waukesha's is 33°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.