Macomb weather in December

In December, Macomb sees average daytime highs of 38°F and overnight lows near 24°F, with 2.1 in of precipitation across 7 wet days and about 9.2 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 42°F in the first days to 35°F by the end. The sky is clear or mostly clear about 27% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 18 min at the start of December to 9 h 06 min by month's end. Set against the rest of the year, December is Macomb's 11th-clearest and 6th-windiest month. For the whole year in context, see Macomb's year-round climate.

Daytime high
38°
10th warmest
Overnight low
24°
3rd coldest
Precipitation
2.1 in
7 wet days
Daylight
9 h 06 min
7:25 AM – 4:33 PM
Cloud cover
65%
11th clearest
Wind
9 mph
6th windiest
Solar energy
1.8 kWh/m²
Travel score
0.0
out of 10

Macomb is city in and the county seat of McDonough County, Illinois, United States.

Density
644/km²
people per km²
Founded
1830

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 42°F in the first days to 35°F by the end.

A typical December day in Macomb reaches about 38°F in the afternoon and slips back to 24°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 23°F and 53°F. Set against its neighbours, December runs about 12°F cooler than November and about 5°F warmer than January.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
14328
24328
34227
44227
54126
64126
74026
84026
94025
103925
113925
123924
133824
143824
153824
163824
173724
183723
193723
203723
213723
223723
233622
243622
253622
263622
273622
283521
293521
303521
313521

How December really feels in Macomb

Once humidity and wind are folded in, December 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
14 feel bitter (≤ 14°F)

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

Macomb weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan33° / 19°2.07.64.99.40.0
Feb38° / 22°2.173.810.40.1
Mar50° / 32°2.99.6211.72.3
Apr62° / 43°4.611.90.4135.0
May73° / 54°4.713014.26.2
Jun82° / 64°4.811.7014.85.9
Jul85° / 67°3.39.7014.65.5
Aug83° / 65°3.29.1013.66.1
Sep77° / 57°3.47.6012.37.3
Oct64° / 45°2.88.50.210.95.9
Nov50° / 34°2.7819.82.3
Dec38° / 24°2.173.29.20.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
24159
34159
44159
54159
64159
74159
84159
94159
104159
114060
123961
133961
143961
153961
163862
173763
183763
193763
203862
213763
223664
233664
243664
253565
263565
273664
283763
293763
303763
313763

Chance of precipitation in December

Any precipitationSnow

Macomb gets around 2.1 in of rain and snow over 7 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 23% and peaks near 26% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1268
2258
3259
4249
5249
62410
72410
82310
92310
102310
112310
122310
132310
142310
152310
162310
172310
182310
192310
202310
212310
222210
232210
242210
252210
262210
272211
282211
292211
302212
312212

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1982
2982
3982
4982
5991
6991
7991
8991
9991
10991
11991
12991
13991
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 9 mph in December.

Across December, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze
319light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 18 min at the start of December to 9 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:13 AM to 7:31 AM, and sunset from 4:32 PM to 4:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.37:134:32
29.37:144:32
39.37:154:32
49.37:164:32
59.27:174:32
69.27:174:31
79.27:184:31
89.27:194:31
99.27:204:31
109.27:214:31
119.27:224:32
129.27:224:32
139.17:234:32
149.17:244:32
159.17:244:32
169.17:254:33
179.17:264:33
189.17:264:33
199.17:274:34
209.17:274:34
219.17:284:34
229.17:284:35
239.17:294:35
249.17:294:36
259.17:304:36
269.17:304:37
279.17:304:38
289.17:314:38
299.17:314:39
309.17:314:40
319.17:314:40

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.8 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 6.43 kWh/m² in June across the year — December's 1.8 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.9Dim
21.9Dim
31.9Dim
41.9Dim
51.8Dim
61.8Dim
71.8Dim
81.8Dim
91.8Dim
101.8Dim
111.8Dim
121.8Dim
131.8Dim
141.8Dim
151.8Dim
161.8Dim
171.8Dim
181.8Dim
191.8Dim
201.8Dim
211.8Dim
221.8Dim
231.8Dim
241.8Dim
251.8Dim
261.8Dim
271.8Dim
281.8Dim
291.8Dim
301.8Dim
311.8Dim
Planning a trip in December

Is December a good time to visit Macomb?

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

0.0
Sightseeing
11th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Macomb.

What to pack for Macomb in December

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

In December, Macomb sees daytime highs around 38°F and nights near 24°F. Pack a warm layer and a heavy coat. About 7 days see rain.

a warm layera heavy coat

UV index in Macomb in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Macomb peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 19UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Macomb in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Macomb is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1815 µg/m³Oct 227 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar12Good
Apr10Good
May13Moderate
Jun13Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov8Good
Dec9Good
Location & terrain

Where is Macomb?

Macomb sits at 40.5°N, 90.7°W, 705 ft above sea level, in United States. The nearest listed city is Burlington, 34 mi away.

Topography around Macomb

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

Within 2 miles, the terrain around Macomb has only modest variations in elevation — a maximum elevation change of 141 ft around an average of 682 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 256 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 472 ft.

The land around Macomb is covered by trees (32%), cropland (27%) and grassland (23%) within 2 miles, cropland (73%) within 10 miles, and cropland (63%) and trees (27%) within 50 miles.

2 miles
141 ft
10 miles
256 ft
50 miles
472 ft
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Burlington 34 mi · Galesburg 37 mi · Quincy 53 mi · Pekin 55 mi · Jacksonville 55 mi · East Peoria 59 mi · Peoria 59 mi · North Peoria 60 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 Macomb (40.4592°, -90.6718°, elevation 705 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. 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).