Climateby Month

Waterbury, CT climate by month

NOAA 1991-2020 normals · 271 ft elevation

Waterbury has warm and often humid summers and cold and snowy winters. Highs peak at 84°F in July and fall to 36°F in January. Wet days are spread through the year, from about 9 to 12 a month. Normal snowfall is about 59 in a year. By our comfort score the best months are May and September.

Warmest month
84°F
July normal high
Coldest month
17°F
January normal low
Wet days a year
123
53.5 in of precipitation
Snow a year
59.1 in
normal snowfall

How warm is Waterbury?

Normal highs range from 36°F in January to 84°F in July.

0°20°40°60°80°100° January: normal high 36°F (2°C), low 17°F (-8°C) 36° 17° February: normal high 39°F (4°C), low 18°F (-8°C) March: normal high 47°F (8°C), low 26°F (-3°C) April: normal high 60°F (16°C), low 36°F (2°C) May: normal high 70°F (21°C), low 47°F (8°C) June: normal high 79°F (26°C), low 57°F (14°C) July: normal high 84°F (29°C), low 62°F (17°C) 84° 62° August: normal high 82°F (28°C), low 60°F (16°C) September: normal high 75°F (24°C), low 53°F (12°C) October: normal high 63°F (17°C), low 41°F (5°C) November: normal high 52°F (11°C), low 32°F (0°C) December: normal high 41°F (5°C), low 24°F (-4°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Waterbury?

May has the most wet days (about 12); the year brings about 53 in of precipitation.

January: 10 wet days February: 9 wet days 9 March: 10 wet days April: 11 wet days May: 12 wet days 12 June: 11 wet days July: 11 wet days August: 10 wet days September: 9 wet days October: 10 wet days November: 9 wet days December: 11 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 59.1 in a year, most of it in February.

January: 13.1 in of snow February: 15.8 in of snow 15.8 March: 12.7 in of snow April: 2.6 in of snow May: 0.0 in of snow 0.0 June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.3 in of snow November: 2.6 in of snow December: 12.0 in of snow JFMAMJJASOND

How humid is Waterbury?

Muggy days peak in July, at about 11 days.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 5 muggy days July: 11 muggy days 11 August: 10 muggy days September: 4 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Bradley International Airport, 32 mi NE of the city center (the nearest airport with complete hourly records).

How much daylight?

Daylight ranges from about 9.2 hours in December to 15.1 hours in June.

January: 9.6 hours of daylight February: 10.6 hours of daylight March: 12.0 hours of daylight April: 13.3 hours of daylight May: 14.5 hours of daylight June: 15.1 hours of daylight 15.1 July: 14.8 hours of daylight August: 13.8 hours of daylight September: 12.5 hours of daylight October: 11.1 hours of daylight November: 9.9 hours of daylight December: 9.2 hours of daylight 9.2 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Waterbury, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 36°F17°F 3.6 in10 13.1 in 0 9.6 h
February 39°F18°F 3.4 in9 15.8 in 0 10.6 h
March 47°F26°F 4.2 in10 12.7 in 0 12.0 h
April 60°F36°F 4.3 in11 2.6 in 0 13.3 h
May 70°F47°F 4.2 in12 0.0 in 0 14.5 h
June 79°F57°F 4.8 in11 0.0 in 5 15.1 h
July 84°F62°F 4.4 in11 0.0 in 11 14.8 h
August 82°F60°F 5.1 in10 0.0 in 10 13.8 h
September 75°F53°F 5.0 in9 0.0 in 4 12.5 h
October 63°F41°F 5.7 in10 0.3 in 0 11.1 h
November 52°F32°F 3.9 in9 2.6 in 0 9.9 h
December 41°F24°F 4.8 in11 12.0 in 0 9.2 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Waterbury

By our comfort score, the best months are May and September.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 280721
Feb 320617
Mar 43279
Apr 60871
May 721681
Jun 681282
Jul 56586
Aug 58773
Sep 691661
Oct 601270
Nov 44363
Dec 300816

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Waterbury

The last spring frost typically comes around Apr 26, and the first fall frost around Oct 16, leaving 175 frost-free days in a typical year.

Frost and freeze dates for Waterbury
Typical date1 year in 10
Last spring frost (32°F)Apr 26after May 9
First fall frost (32°F)Oct 16before Oct 4
Last hard freeze (28°F)Apr 10after Apr 28
First hard freeze (28°F)Oct 30before Oct 14
Frost-free season175 daysunder 156 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Meriden Markham Muni Airport (USW00054788), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Connecticut.

Hottest and coldest readings, 1991-2020

The highest reading was 100°F (July 23, 2011, and 2 other days); the lowest was -25°F (February 14, 2016).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Waterbury

Similar climates elsewhere

Where the numbers come from

  • Temperature and rain: Burlington (USC00060973), 17 mi NNE of the city center, 505 ft (234 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Snowfall and snow depth: Bakersville (USC00060227), 20 mi N of the city center, 686 ft (415 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Frost dates: Meriden Markham Muni Airport (USW00054788), 12 mi ESE of the city center, 103 ft (168 ft lower than the city). NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour: Hartford Bradley Intl Airport (USW00014740), 32 mi NE of the city center, 190 ft (81 ft lower than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Bradley International Airport (725080-14740), 32 mi NE of the city center, 169 ft (102 ft lower than the city). Hourly observations, 1991-2020.
  • Not available for this location: cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error