Stamford weather in December

In December, Stamford sees average daytime highs of 43°F and overnight lows near 33°F, with 4.1 in of precipitation across 9.8 wet days and about 9.1 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 46°F in the first days to 40°F by the end. The sky is clear or mostly clear about 32% 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 Stamford's 8th-clearest and 1st-windiest month. For the whole year in context, see Stamford's year-round climate.

Daytime high
43°
10th warmest
Overnight low
33°
3rd coldest
Precipitation
4.1 in
9.8 wet days
Daylight
9 h 06 min
7:19 AM – 4:22 PM
Cloud cover
60%
8th clearest
Wind
9 mph
1st windiest
Solar energy
1.73 kWh/m²
Travel score
0.5
out of 10

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

Density
956/km²
people per km²
Founded
1641

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 46°F in the first days to 40°F by the end.

A typical December day in Stamford reaches about 43°F in the afternoon and slips back to 33°F overnight — a 10°F spread between the day's warmth and the night's chill. On most days the high lands between 32°F and 54°F. Set against its neighbours, December runs about 9°F cooler than November and about 5°F warmer than January.

20°30°40°50°60°151015202531
Avg high (°F)Avg low (°F)
14737
24737
34636
44636
54635
64535
74535
84435
94434
104434
114334
124333
134333
144333
154233
164233
174232
184232
194232
204232
214232
224131
234131
244131
254131
264131
274030
284030
294030
304030
314029

How December really feels in Stamford

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.

Stamford weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 26°3.394.69.40.0
Feb39° / 27°3.18.6410.40.0
Mar46° / 34°4.110.33.411.71.2
Apr57° / 44°3.610.50.413.13.9
May67° / 54°3.410.9014.35.9
Jun76° / 64°3.710.8014.96.6
Jul82° / 70°3.610.8014.66.3
Aug80° / 69°4.110.5013.66.5
Sep73° / 62°3.79012.37.0
Oct62° / 51°4.08.5010.95.6
Nov52° / 41°3.28.50.49.72.9
Dec43° / 33°4.19.82.79.10.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34753
44654
54654
64654
74456
84456
94456
104456
114357
124357
134357
144357
154357
164357
174357
184357
194555
204654
214753
224753
234753
244951
254951
264951
274951
284951
294951
305050
315050

Chance of precipitation in December

Any precipitationSnow

Stamford gets around 4.1 in of rain and snow over 9.8 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 31% and peaks near 33% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1315
2316
3327
4327
5328
6338
7339
8339
93310
103310
113310
123311
133311
143210
153210
163210
17319
18319
19309
20309
21308
22298
23298
24298
25298
26298
27309
28309
293010
303110
313111

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 9 mph in December, the windiest month of the year.

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
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
109light breeze
119light breeze
129light breeze
139light 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 7:06 AM to 7:25 AM, and sunset from 4:22 PM to 4:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.37:064:22
29.27:074:22
39.27:084:21
49.27:094:21
59.27:104:21
69.27:114:21
79.27:124:21
89.17:124:21
99.17:134:21
109.17:144:21
119.17:154:21
129.17:164:21
139.17:164:21
149.17:174:22
159.17:184:22
169.17:194:22
179.17:194:22
189.17:204:23
199.07:204:23
209.07:214:24
219.07:214:24
229.07:224:24
239.07:224:25
249.07:234:25
259.07:234:26
269.17:234:27
279.17:244:27
289.17:244:28
299.17:244:28
309.17:254:29
319.17:254:30

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.73 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 6.1 kWh/m² in June across the year — December's 1.73 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.9Dim
21.9Dim
31.8Dim
41.8Dim
51.8Dim
61.8Dim
71.8Dim
81.8Dim
91.7Dim
101.7Dim
111.7Dim
121.7Dim
131.7Dim
141.7Dim
151.7Dim
161.7Dim
171.7Dim
181.7Dim
191.7Dim
201.7Dim
211.7Dim
221.7Dim
231.7Dim
241.7Dim
251.7Dim
261.8Dim
271.8Dim
281.8Dim
291.8Dim
301.8Dim
311.8Dim
Planning a trip in December

Hazard calendar for Stamford

In seasonPeak

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

Stamford 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 Stamford?

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

0.5
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 Stamford.

What to pack for Stamford in December

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

In December, Stamford sees daytime highs around 43°F and nights near 33°F. Pack a warm layer. Worth having: a heavy coat and rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Stamford 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 10 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 Stamford 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 Stamford 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 Stamford 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 Stamford 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 Stamford?

Stamford sits at 41.1°N, 73.5°W, 23 ft above sea level, in United States. The nearest listed city is Darien, 3.7 mi away.

Topography around Stamford

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

Within 2 miles, the terrain around Stamford has only modest variations in elevation — a maximum elevation change of 236 ft around an average of 59 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 712 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,909 ft.

The land around Stamford is covered by trees (42%) and artificial surfaces (38%) within 2 miles, trees (48%) and water (41%) within 10 miles, and trees (53%) and water (32%) within 50 miles.

2 miles
236 ft
10 miles
712 ft
50 miles
1,909 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Darien 3.7 mi · North Stamford 5.6 mi · New Canaan 6.8 mi · Port Chester 7.5 mi · Norwalk 8.1 mi · East Norwalk 8.1 mi · Rye 9.3 mi · Harrison 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 Stamford (41.0534°, -73.5387°, elevation 23 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).