Climate averages 1991–2020

Waterbury weather
in January.

A cold, moderately wet month: the coolest and the joint 3rd driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 2.1°C Daytime mean, January

Average low -5.9°C Night-time mean, January

Rainfall 88 mm 10 days with ≥1 mm

Daylight 10 h Sunrise to sunset, per day

January is a cold month in Waterbury: daytime highs average 2.1°C and nights cool to about -5.9°C. By daytime temperature it is the coolest month of the year.

Expect about 88 mm of rain on roughly 10 days, which makes January a moderately wet month (the joint 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 32 min on an average January day.

The nearest other city in this atlas is New Britain (25 km away). In January its highs average 2.0°C, about as warm as Waterbury, with 84 mm of precipitation.

Among the 498 cities listed in the United States, Waterbury ranks joint 389th of 498 for the warmest January highs and joint 340th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Waterbury is 7.4°C cooler than that mean.

From January to February, average highs rise by 1.4°C to 3.5°C, and monthly rainfall falls from 88 mm to 78 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Waterbury climate table

1991–2020

Monthly climate averages for Waterbury, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	2.1°C-5.9°C	-5.9°C	88	9.5	9.510 h
February	3.5°C-5.2°C	-5.2°C	78	8.7	10.611 h
March	7.8°C-1.4°C	-1.4°C	106	10.7	11.912 h
April	14.4°C4.4°C	4.4°C	97	11.2	13.313 h
May	20.0°C10.3°C	10.3°C	87	11.4	14.514 h
June	25.1°C15.6°C	15.6°C	100	11.2	15.115 h
July	28.2°C18.9°C	18.9°C	90	10.9	14.915 h
August	27.2°C18.3°C	18.3°C	104	10.2	13.814 h
September	23.2°C14.6°C	14.6°C	101	9.1	12.513 h
October	16.5°C8.6°C	8.6°C	106	9.1	11.111 h
November	10.3°C2.9°C	2.9°C	88	8.5	9.910 h
December	4.8°C-2.1°C	-2.1°C	107	10.1	9.29 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

January in nearby cities

Distance from Waterbury

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Waterbury) is explained once on the Waterbury year overview and on the Sources, method and limits page.