Chesterfield weather in December

In December, Chesterfield sees average daytime highs of 43°F and overnight lows near 28°F, with 2.5 in of precipitation across 8.1 wet days and about 9.3 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 47°F in the first days to 41°F by the end. The sky is clear or mostly clear about 29% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 30 min at the start of December to 9 h 18 min by month's end. Set against the rest of the year, December is Chesterfield's 11th-clearest and 6th-windiest month. For the whole year in context, see Chesterfield's year-round climate.

Daytime high
43°
11th warmest
Overnight low
28°
3rd coldest
Precipitation
2.5 in
8.1 wet days
Daylight
9 h 18 min
7:19 AM – 4:38 PM
Cloud cover
64%
11th clearest
Wind
7 mph
6th windiest
Solar energy
1.91 kWh/m²
Travel score
0.6
out of 10

Chesterfield is city in St. Louis County, Missouri, United States.

Density
551/km²
people per km²
Founded
1837

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 47°F in the first days to 41°F by the end.

A typical December day in Chesterfield reaches about 43°F in the afternoon and slips back to 28°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 29°F and 58°F. Set against its neighbours, December runs about 11°F cooler than November and about 4°F warmer than January.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
14832
24732
34731
44731
54631
64630
74530
84530
94529
104429
114429
124429
134329
144328
154328
164328
174328
184228
194228
204227
214227
224227
234227
244127
254127
264126
274126
284126
294126
304026
314026

How December really feels in Chesterfield

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
wind chill below the day's low

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

Chesterfield weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 24°2.6839.60.0
Feb44° / 28°2.47.82.810.50.8
Mar55° / 37°3.710.81.411.73.5
Apr66° / 47°4.511.40.2135.8
May75° / 58°4.913.4014.16.2
Jun84° / 67°4.011.2014.65.4
Jul87° / 70°3.39.8014.44.7
Aug86° / 68°2.99013.55.3
Sep79° / 60°3.27.6012.37.1
Oct67° / 48°3.48.40116.6
Nov54° / 37°3.68.70.89.93.5
Dec43° / 28°2.58.12.29.30.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24456
34357
44357
54357
64258
74159
84159
94060
104060
114060
124060
134060
144060
154060
164060
174060
184159
194060
204060
214060
224060
233961
244060
253961
263961
273961
283961
293961
303862
313862

Chance of precipitation in December

Any precipitationSnow

Chesterfield gets around 2.5 in of rain and snow over 8.1 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 27% and peaks near 28% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1286
2276
3277
4277
5277
6277
7277
8277
9277
10287
11287
12287
13287
14287
15287
16287
17287
18287
19277
20277
21277
22267
23267
24257
25257
26257
27257
28257
29257
30258
31258

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
5982
6982
7982
8982
9982
10982
11991
12991
13991
14991
15991
16991
171000
181000
191000
201000
211000
221000
231000
241000
251000
26991
27991
28991
29991
30991
31991

Wind in December

Winds average 7 mph in December.

Across December, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
97light breeze
107light breeze
117light breeze
127light breeze
137light breeze
147light breeze
157light breeze
167light breeze
177light breeze
187light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 30 min at the start of December to 9 h 18 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 7:07 AM to 7:26 AM, and sunset from 4:37 PM to 4:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.57:074:37
29.57:084:37
39.57:094:37
49.47:104:37
59.47:114:36
69.47:124:36
79.47:134:36
89.47:134:36
99.47:144:36
109.47:154:37
119.47:164:37
129.37:164:37
139.37:174:37
149.37:184:37
159.37:194:38
169.37:194:38
179.37:204:38
189.37:204:38
199.37:214:39
209.37:214:39
219.37:224:40
229.37:224:40
239.37:234:41
249.37:234:41
259.37:244:42
269.37:244:42
279.37:244:43
289.37:254:43
299.37:254:44
309.37:254:45
319.37:264:45

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.91 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.91 kWh/m² to a high of 6.42 kWh/m² in June across the year — December's 1.91 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.0Moderate
22.0Moderate
32.0Moderate
42.0Dim
52.0Dim
62.0Dim
71.9Dim
81.9Dim
91.9Dim
101.9Dim
111.9Dim
121.9Dim
131.9Dim
141.9Dim
151.9Dim
161.9Dim
171.9Dim
181.9Dim
191.9Dim
201.9Dim
211.9Dim
221.9Dim
231.9Dim
241.9Dim
251.9Dim
261.9Dim
271.9Dim
281.9Dim
291.9Dim
301.9Dim
311.9Dim
Planning a trip in December

Hazard calendar for Chesterfield

In seasonPeak

None of Chesterfield's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Chesterfield sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Chesterfield?

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

0.6
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 Chesterfield.

What to pack for Chesterfield in December

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

In December, Chesterfield sees daytime highs around 43°F and nights near 28°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 8 days see rain.

a warm layera heavy coatrain gear

UV index in Chesterfield 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 Chesterfield peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJun 23UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Chesterfield 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 Chesterfield is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1616 µg/m³Oct 237 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar11Good
Apr10Good
May13Moderate
Jun14Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Chesterfield?

Chesterfield sits at 38.7°N, 90.6°W, 472 ft above sea level, in United States. The nearest listed city is Ballwin, 5.0 mi away.

Topography around Chesterfield

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

Within 2 miles, the terrain around Chesterfield has only modest variations in elevation — a maximum elevation change of 246 ft around an average of 531 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 643 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,040 ft.

The land around Chesterfield is covered by trees (44%) and artificial surfaces (21%) within 2 miles, trees (58%) within 10 miles, and trees (54%) and cropland (29%) within 50 miles.

2 miles
246 ft
10 miles
643 ft
50 miles
1,040 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Ballwin 5.0 mi · Manchester 5.6 mi · Wildwood 7.5 mi · Creve Coeur 8.1 mi · Maryland Heights 8.7 mi · Saint Charles 9.9 mi · Saint Peters 9.9 mi · Kirkwood 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 Chesterfield (38.6631°, -90.5771°, elevation 472 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).