Waterbury weather in January

In January, Waterbury sees average daytime highs of 37°F and overnight lows near 23°F, with 3.5 in of precipitation across 9.5 wet days and about 9.3 hours of daylight. It is the 12th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 37°F through the month. The sky is clear or mostly clear about 34% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 hours at the start of January to 9 h 48 min by month's end. Set against the rest of the year, January is Waterbury's 5th-clearest and 2nd-windiest month. For the whole year in context, see Waterbury's year-round climate.

Daytime high
37°
12th warmest
Overnight low
23°
1st coldest
Precipitation
3.5 in
9.5 wet days
Daylight
9 h 18 min
7:22 AM – 4:41 PM
Cloud cover
58%
5th clearest
Wind
8 mph
2nd windiest
Solar energy
2.07 kWh/m²
Travel score
0.0
out of 10

Waterbury is city in New Haven County, Connecticut, United States.

Density
1,451/km²
people per km²
Founded
1686

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 37°F through the month.

A typical January day in Waterbury reaches about 37°F in the afternoon and slips back to 23°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 23°F and 49°F. Set against its neighbours, January runs about 5°F cooler than December and about 2°F cooler than February.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
13826
23826
33825
43825
53825
63725
73724
83724
93724
103724
113724
123723
133623
143623
153623
163623
173622
183622
193622
203622
213522
223622
233622
243622
253622
263622
273622
283622
293622
303622
313722

How January really feels in Waterbury

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
19 feel bitter (≤ 14°F)

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

Waterbury weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 23°3.59.55.69.30.0
Feb39° / 24°3.08.64.810.30.0
Mar46° / 31°4.210.73.711.71.4
Apr58° / 41°3.811.20.813.14.1
May68° / 50°3.411.4014.36.0
Jun77° / 60°3.911.3014.96.5
Jul83° / 66°3.510.9014.75.7
Aug81° / 64°4.110.3013.76.4
Sep74° / 57°4.09.1012.36.9
Oct62° / 46°4.29.10.210.95.5
Nov51° / 37°3.58.50.89.72.6
Dec41° / 29°4.210.1490.3

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35149
45149
55050
65050
74951
84951
94951
104951
114951
124951
134951
144951
154951
164951
174951
184951
194951
204951
214951
224951
234951
244951
254951
265050
275050
285149
295050
305050
315050

Chance of precipitation in January

Any precipitationSnow

Waterbury gets around 3.5 in of rain and snow over 9.5 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 31% and peaks near 33% on the wettest days, and about 6 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
13215
23216
33317
43317
53317
63318
73318
83318
93319
103319
113319
123219
133219
143219
153119
163118
173018
183018
192918
202918
212918
222818
232817
242817
252817
262817
272817
282817
292817
302817
312817

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 8 mph in January.

Across January, daily wind ranges from about 8 mph on the calmest days to 8 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
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light 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 January

DaylightNight

Daylight runs from about 9 hours at the start of January to 9 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over January. Sunrise moves from 7:24 AM to 7:13 AM, and sunset from 4:27 PM to 4:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.07:244:27
29.07:244:27
39.17:244:28
49.17:244:29
59.17:244:30
69.17:244:31
79.17:244:32
89.17:244:32
99.27:244:33
109.27:244:34
119.27:244:35
129.27:244:36
139.27:234:37
149.37:234:38
159.37:234:40
169.37:224:41
179.37:224:42
189.47:224:43
199.47:214:44
209.47:214:45
219.47:204:46
229.57:194:47
239.57:194:49
249.57:184:50
259.67:184:51
269.67:174:52
279.67:164:53
289.77:154:54
299.77:154:56
309.77:144:57
319.87:134:58

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.07 kWh/m².

For context, solar energy here swings from a low near 1.7 kWh/m² to a high of 6.1 kWh/m² in June across the year — January's 2.07 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
11.8Dim
21.8Dim
31.8Dim
41.8Dim
51.8Dim
61.8Dim
71.8Dim
81.9Dim
91.9Dim
101.9Dim
111.9Dim
121.9Dim
132.0Dim
142.0Dim
152.0Moderate
162.0Moderate
172.1Moderate
182.1Moderate
192.1Moderate
202.2Moderate
212.2Moderate
222.2Moderate
232.3Moderate
242.3Moderate
252.3Moderate
262.4Moderate
272.4Moderate
282.4Moderate
292.5Moderate
302.5Moderate
312.5Moderate
Planning a trip in January

Hazard calendar for Waterbury

In seasonPeak

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

Waterbury 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 January a good time to visit Waterbury?

Our two travel scores rate January 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
9th-best month of the year

January is a weaker month for outdoor sightseeing in Waterbury.

What to pack for Waterbury in January

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

In January, Waterbury sees daytime highs around 37°F and nights near 23°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Waterbury in January

The nearest coast averages about 39°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 30 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 Jul 1 to Sep 30 — about 3 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
May54Bracing
Jun65Cool
Jul72Refreshing
Aug74Refreshing
Sep71Refreshing
Oct64Cool
Nov55Bracing
Dec46Bracing

UV index in Waterbury in January

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Waterbury 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
Mar4Moderate
Apr6High
May8Very high
Jun7Very high
Jul8Very high
Aug5High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Waterbury 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 Waterbury is worst in July — around 20 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1120 µg/m³Nov 188 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr16Moderate
May19Moderate
Jun20Moderate
Jul20Moderate
Aug17Moderate
Sep13Moderate
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is Waterbury?

Waterbury sits at 41.6°N, 73.1°W, 269 ft above sea level, in United States. The nearest listed city is Wolcott, 4.3 mi away.

Topography around Waterbury

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

Within 2 miles, the terrain around Waterbury has only modest variations in elevation — a maximum elevation change of 620 ft around an average of 476 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,007 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,785 ft.

The land around Waterbury is covered by trees (58%) and artificial surfaces (34%) within 2 miles, trees (83%) within 10 miles, and trees (74%) within 50 miles.

2 miles
620 ft
10 miles
1,007 ft
50 miles
2,785 ft
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Wolcott 4.3 mi · Naugatuck 5.0 mi · Cheshire 8.7 mi · Southington 9.3 mi · Bristol 9.3 mi · Southbury 9.9 mi · Seymour 11 mi · Meriden 12 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 Waterbury (41.5581°, -73.0515°, elevation 269 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).