Brookfield weather in January

In January, Brookfield sees average daytime highs of 29°F and overnight lows near 17°F, with 2.0 in of precipitation across 8.9 wet days and about 9.2 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°F through the month. The sky is clear or mostly clear about 20% of the time in January, and the air most often feels dry.

Daylight stretches from about 8 h 54 min at the start of January to 9 h 36 min by month's end. Set against the rest of the year, January is Brookfield's 12th-clearest and 2nd-windiest month. For the whole year in context, see Brookfield's year-round climate.

Daytime high
29°
12th warmest
Overnight low
17°
1st coldest
Precipitation
2.0 in
8.9 wet days
Daylight
9 h 12 min
7:27 AM – 4:36 PM
Cloud cover
72%
12th clearest
Wind
11 mph
2nd windiest
Solar energy
1.82 kWh/m²
Travel score
0.0
out of 10

Brookfield is city in Waukesha County, Wisconsin, United States.

Density
532/km²
people per km²
Founded
1954

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°F through the month.

A typical January day in Brookfield reaches about 29°F in the afternoon and slips back to 17°F overnight — a 11°F spread between the day's warmth and the night's chill. On most days the high lands between 14°F and 40°F. Set against its neighbours, January runs about 5°F cooler than December and about 2°F cooler than February.

20°40°151015202531
Avg high (°F)Avg low (°F)
13120
23120
33120
43020
53019
63019
73019
83019
92918
102918
112918
122918
132917
142917
152817
162817
172817
182817
192816
202816
212816
222816
232816
242816
252816
262816
272816
282816
292817
302817
312817

How January really feels in Brookfield

Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
31
31 feel bitter (≤ 14°F)

The story in January is cold — wind chill drags the overnight "feels like" below the raw low.

Brookfield weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan29° / 17°2.08.96.89.20.0
Feb31° / 19°1.975.510.20.0
Mar40° / 28°2.49.54.111.60.2
Apr50° / 38°4.111.91.713.12.2
May62° / 48°3.611.6014.44.9
Jun73° / 60°3.510.8015.16.6
Jul79° / 66°3.210.1014.96.7
Aug77° / 65°3.610.7013.86.8
Sep71° / 58°3.09.2012.36.7
Oct58° / 46°3.19.10.210.84.4
Nov45° / 34°2.48.61.79.51.0
Dec34° / 24°2.28.55.48.90.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
42971
52971
62971
72971
83070
93070
103070
113070
123169
133169
143169
153268
163268
173268
183268
193268
203367
213466
223466
233466
243466
253466
263565
273565
283466
293466
303466
313565

Chance of precipitation in January

Any precipitationSnow

Brookfield gets around 2.0 in of rain and snow over 8.9 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 28% and peaks near 31% on the wettest days, and about 7 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12819
22819
32919
42920
53020
63021
73121
83122
93122
103122
113022
123022
133022
143023
153023
162923
172923
182823
192823
202723
212723
222622
232622
242622
252622
262622
272622
282522
292522
302522
312522

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 11 mph in January.

Across January, daily wind ranges from about 10 mph on the calmest days to 11 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
111light breeze
211light breeze
311light breeze
411light breeze
511light breeze
611light breeze
711light breeze
811light breeze
911light breeze
1011light breeze
1111light breeze
1211light breeze
1311light breeze
1411light breeze
1511light breeze
1611light breeze
1711light breeze
1811light breeze
1911light breeze
2011light breeze
2111light breeze
2211light breeze
2311light breeze
2411light breeze
2511light breeze
2611light breeze
2711light breeze
2811light breeze
2911light breeze
3010light breeze
3110light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 8 h 54 min at the start of January to 9 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over January. Sunrise moves from 7:30 AM to 7:17 AM, and sunset from 4:22 PM to 4:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.97:304:22
28.97:304:22
38.97:304:23
48.97:304:24
58.97:304:25
68.97:304:26
79.07:304:27
89.07:294:28
99.07:294:29
109.07:294:30
119.07:294:31
129.17:294:32
139.17:284:33
149.17:284:34
159.17:284:35
169.27:274:36
179.27:274:37
189.27:264:39
199.27:264:40
209.37:254:41
219.37:254:42
229.37:244:43
239.47:234:45
249.47:234:46
259.47:224:47
269.57:214:48
279.57:204:49
289.57:204:51
299.67:194:52
309.67:184:53
319.67:174:55

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1.82 kWh/m².

For context, solar energy here swings from a low near 1.49 kWh/m² to a high of 6.43 kWh/m² in June across the year — January's 1.82 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
11.5Dim
21.5Dim
31.5Dim
41.6Dim
51.6Dim
61.6Dim
71.6Dim
81.6Dim
91.6Dim
101.7Dim
111.7Dim
121.7Dim
131.7Dim
141.8Dim
151.8Dim
161.8Dim
171.8Dim
181.9Dim
191.9Dim
201.9Dim
212.0Dim
222.0Dim
232.0Moderate
242.1Moderate
252.1Moderate
262.1Moderate
272.2Moderate
282.2Moderate
292.2Moderate
302.3Moderate
312.3Moderate
Planning a trip in January

Is January a good time to visit Brookfield?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
8th-best month of the year

January is a weaker month for outdoor sightseeing in Brookfield.

What to pack for Brookfield in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Brookfield sees daytime highs around 29°F and nights near 17°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Brookfield in January

The nearest coast averages about 38°F in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 12 mi away) is warmest in August at about 70°F and coldest in March near 36°F.

It's comfortable for a long swim from Jul 29 to Aug 30 — about 1.1 months when the water holds above 68°F.

30°40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr38Bracing
May42Bracing
Jun54Bracing
Jul67Cool
Aug70Refreshing
Sep66Cool
Oct56Bracing
Nov46Bracing
Dec41Bracing

UV index in Brookfield in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Brookfield peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 20UV 9Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Brookfield in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Brookfield is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1017 µg/m³Oct 249 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar15Moderate
Apr15Moderate
May16Moderate
Jun17Moderate
Jul17Moderate
Aug16Moderate
Sep13Moderate
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Brookfield?

Brookfield sits at 43.1°N, 88.1°W, 830 ft above sea level, in United States. The nearest listed city is Wauwatosa, 5.0 mi away.

Topography around Brookfield

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Brookfield.

Within 2 miles, the terrain around Brookfield has only modest variations in elevation — a maximum elevation change of 262 ft around an average of 846 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 568 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 846 ft.

The land around Brookfield is covered by trees (65%) within 2 miles, trees (41%), artificial surfaces (33%) and grassland (20%) within 10 miles, and water (34%), cropland (29%) and trees (20%) within 50 miles.

2 miles
262 ft
10 miles
568 ft
50 miles
846 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Wauwatosa 5.0 mi · New Berlin 5.6 mi · West Allis 5.6 mi · Waukesha 7.5 mi · Menomonee Falls 8.1 mi · Greenfield 8.1 mi · Milwaukee 9.9 mi · Muskego 11 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Brookfield (43.0606°, -88.1065°, elevation 830 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).