Waterbury weather by month
What a typical year looks like in Waterbury, Connecticut: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at MOUNT CARMEL, 20 km from Waterbury; records cover 1936–2026.
The year at a glance
- Precipitation a year
- 50.4 in1280 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 18
- First fall freeze
- Oct 19
- Heating degree days
- 5,642
- Cooling degree days
- 817
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 3°−16° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Waterbury in January
Highs average 38°3° and lows 20°−7°, with 3.6 in91 mm of precipitation in a typical January.
- Record high
- 70°21° (2007)
- Record low
- −17°−27° (1961)
- Heating degree days
- 1117
- Cooling degree days
- 0
Waterbury in February
Highs average 41°5° and lows 22°−6°, with 3.5 in88 mm of precipitation in a typical February.
- Record high
- 69°21° (1985)
- Record low
- −24°−31° (1943)
- Heating degree days
- 944
- Cooling degree days
- 0
Waterbury in March
Highs average 48°9° and lows 28°−2°, with 4.4 in113 mm of precipitation in a typical March.
- Record high
- 84°29° (1945)
- Record low
- −11°−24° (1948)
- Heating degree days
- 829
- Cooling degree days
- 0
Waterbury in April
Highs average 61°16° and lows 38°3°, with 4.7 in118 mm of precipitation in a typical April.
- Record high
- 93°34° (1990)
- Record low
- 11°−12° (1954)
- Heating degree days
- 474
- Cooling degree days
- 3
Waterbury in May
Highs average 71°22° and lows 48°9°, with 3.7 in93 mm of precipitation in a typical May.
- Record high
- 95°35° (1996)
- Record low
- 23°−5° (2001)
- Heating degree days
- 203
- Cooling degree days
- 32
Waterbury in June
Highs average 79°26° and lows 58°14°, with 4.9 in124 mm of precipitation in a typical June.
- Record high
- 98°37° (1952)
- Record low
- 32°0° (1945)
- Heating degree days
- 33
- Cooling degree days
- 140
Waterbury in July
Highs average 85°29° and lows 64°18°, with 3.8 in97 mm of precipitation in a typical July.
- Record high
- 104°40° (1949)
- Record low
- 38°3° (1945)
- Heating degree days
- 1
- Cooling degree days
- 287
Waterbury in August
Highs average 84°29° and lows 62°17°, with 3.8 in96 mm of precipitation in a typical August.
- Record high
- 101°38° (1948)
- Record low
- 36°2° (1940)
- Heating degree days
- 4
- Cooling degree days
- 245
Waterbury in September
Highs average 76°25° and lows 55°13°, with 4.3 in110 mm of precipitation in a typical September.
- Record high
- 98°37° (1953)
- Record low
- 26°−3° (1947)
- Heating degree days
- 81
- Cooling degree days
- 102
Waterbury in OctoberThis month
Highs average 64°18° and lows 43°6°, with 4.9 in125 mm of precipitation in a typical October.
- Record high
- 90°32° (1938)
- Record low
- 16°−9° (1936)
- Heating degree days
- 352
- Cooling degree days
- 8
Waterbury in November
Highs average 53°11° and lows 34°1°, with 4.4 in110 mm of precipitation in a typical November.
- Record high
- 79°26° (1950)
- Record low
- 1°−17° (1938)
- Heating degree days
- 656
- Cooling degree days
- 0
Waterbury in December
Highs average 42°6° and lows 27°−3°, with 4.5 in115 mm of precipitation in a typical December.
- Record high
- 76°24° (1998)
- Record low
- −18°−28° (1942)
- Heating degree days
- 948
- Cooling degree days
- 0