Danbury weather in December

In December, Danbury sees average daytime highs of 40°F and overnight lows near 27°F, with 4.1 in of precipitation across 10.5 wet days and about 9.1 hours of daylight. It is the 10th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 43°F in the first days to 37°F by the end. The sky is clear or mostly clear about 28% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 12 min at the start of December to 9 hours by month's end. Set against the rest of the year, December is Danbury's 8th-clearest and 4th-windiest month. For the whole year in context, see Danbury's year-round climate.

Daytime high
40°
10th warmest
Overnight low
27°
3rd coldest
Precipitation
4.1 in
10.5 wet days
Daylight
9 hours
7:19 AM – 4:21 PM
Cloud cover
63%
8th clearest
Wind
8 mph
4th windiest
Solar energy
1.67 kWh/m²
Travel score
0.1
out of 10

Danbury is city in Fairfield County, Connecticut, United States.

Density
740/km²
people per km²
Founded
1702

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 43°F in the first days to 37°F by the end.

A typical December day in Danbury reaches about 40°F in the afternoon and slips back to 27°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 28°F and 53°F. Set against its neighbours, December runs about 10°F cooler than November and about 5°F warmer than January.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
14431
24431
34430
44330
54330
64229
74229
84129
94128
104128
114028
124028
134027
144027
153927
163927
173927
183926
193926
203926
213926
223826
233826
243826
253826
263825
273825
283825
293725
303724
313724

How December really feels in Danbury

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.

Danbury weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 21°3.59.45.79.40.0
Feb38° / 22°3.08.74.910.30.0
Mar46° / 30°4.211.14.211.71.2
Apr58° / 40°3.811.30.913.14.1
May68° / 50°3.912014.35.9
Jun77° / 60°4.412014.96.4
Jul82° / 65°4.311.3014.75.9
Aug80° / 64°4.510.9013.76.4
Sep73° / 56°4.39.4012.36.9
Oct61° / 45°4.29.40.210.95.2
Nov50° / 35°3.48.71.29.72.3
Dec40° / 27°4.110.54.59.10.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 57%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24456
34357
44357
54258
64258
74258
84258
94159
104159
114159
124060
134060
144060
154060
164159
174060
184159
194258
204258
214357
224456
234456
244456
254555
264555
274555
284654
294654
304654
314753

Chance of precipitation in December

Any precipitationSnow

Danbury gets around 4.1 in of rain and snow over 10.5 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 33% and peaks near 36% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13310
23311
33411
43412
53513
63514
73614
83615
93615
103616
113616
123616
133516
143516
153416
163415
173415
183315
193214
203214
213114
223114
233114
243013
253013
263113
273114
283114
293214
303215
313215

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 8 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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137light breeze
147light breeze
157light breeze
168light breeze
178light breeze
188light 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 12 min at the start of December to 9 hours 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 4:20 PM to 4:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.27:074:20
29.27:084:20
39.27:094:20
49.27:104:20
59.27:114:20
69.17:114:20
79.17:124:20
89.17:134:20
99.17:144:20
109.17:154:20
119.17:164:20
129.17:164:20
139.07:174:20
149.07:184:20
159.07:194:20
169.07:194:21
179.07:204:21
189.07:214:21
199.07:214:22
209.07:224:22
219.07:224:22
229.07:234:23
239.07:234:23
249.07:244:24
259.07:244:24
269.07:244:25
279.07:254:26
289.07:254:26
299.07:254:27
309.07:254:28
319.07:264:28

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.67 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.67 kWh/m² to a high of 6 kWh/m² in June across the year — December's 1.67 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.8Dim
21.8Dim
31.8Dim
41.7Dim
51.7Dim
61.7Dim
71.7Dim
81.7Dim
91.7Dim
101.7Dim
111.7Dim
121.6Dim
131.6Dim
141.6Dim
151.6Dim
161.6Dim
171.6Dim
181.6Dim
191.6Dim
201.6Dim
211.6Dim
221.6Dim
231.7Dim
241.7Dim
251.7Dim
261.7Dim
271.7Dim
281.7Dim
291.7Dim
301.7Dim
311.7Dim
Planning a trip in December

Hazard calendar for Danbury

In seasonPeak

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

Danbury 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 Danbury?

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

0.1
Sightseeing
10th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Danbury.

What to pack for Danbury in December

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

In December, Danbury sees daytime highs around 40°F and nights near 27°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 11 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Danbury in December

The nearest coast averages about 46°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 mi away) is warmest in August at about 74°F and coldest in February near 35°F.

It's comfortable for a long swim from Jun 30 to Sep 30 — about 3.1 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan39Bracing
Feb35Bracing
Mar37Bracing
Apr44Bracing
May55Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct64Cool
Nov55Bracing
Dec46Bracing

UV index in Danbury in December

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Danbury peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 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 highHighModerateLowJul 11UV 8Dec 23UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Danbury 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 Danbury is worst in July — around 20 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJul 1220 µg/m³Nov 1612 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar17Moderate
Apr17Moderate
May18Moderate
Jun19Moderate
Jul20Moderate
Aug17Moderate
Sep16Moderate
Oct13Moderate
Nov11Good
Dec13Moderate
Location & terrain

Where is Danbury?

Danbury sits at 41.4°N, 73.5°W, 397 ft above sea level, in United States. The nearest listed city is Wilton, 14 mi away.

Topography around Danbury

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

Within 2 miles, the terrain around Danbury has only modest variations in elevation — a maximum elevation change of 663 ft around an average of 486 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,243 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,822 ft.

The land around Danbury is covered by trees (62%) and artificial surfaces (26%) within 2 miles, trees (83%) within 10 miles, and trees (72%) within 50 miles.

2 miles
663 ft
10 miles
1,243 ft
50 miles
2,822 ft
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Wilton 14 mi · Southbury 14 mi · Trumbull 17 mi · New Canaan 17 mi · Westport 18 mi · North Stamford 18 mi · Norwalk 19 mi · Shelton 19 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 Danbury (41.3948°, -73.454°, elevation 397 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). 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).