What is the hottest month in Derby, CT?

July is the warmest month, with a normal high of 82°F at Ansonia 1 NE.

What is the coldest month in Derby, CT?

January is the coldest month, with a normal low of 18°F.

What is the wettest month in Derby, CT?

October has the most precipitation on average, about 5.00 inches.

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Checked Oct 25, 2026

Derby, CT Climate

1991 to 2020 normals at Ansonia 1 NE, 1.5 mi from the center of Derby, elevation 136 ft.

Average weather by month

Select a month for daily normals and last year's weather

Month	High	Low	Precip.	Snow
January	36°	18°	3.95 in	--
February	38°	19°	3.62 in	--
March	47°	27°	4.72 in	--
April	58°	38°	4.72 in	--
May	69°	47°	4.04 in	--
June	77°	58°	3.93 in	--
July	82°	63°	4.30 in	--
August	82°	62°	4.56 in	--
September	75°	54°	4.38 in	--
October	63°	41°	5.00 in	--
November	52°	32°	4.24 in	--
December	41°	23°	4.57 in	--
Year	60°		52.03 in	--

Frequently asked questions

What is the hottest month in Derby, CT?: July is the warmest month, with a normal high of 82°F at Ansonia 1 NE.
What is the coldest month in Derby, CT?: January is the coldest month, with a normal low of 18°F.
What is the wettest month in Derby, CT?: October has the most precipitation on average, about 5.00 inches.

Today

Derby, CT forecast

Data sources

U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information · Official site
U.S. Climate Normals 1991-2020 (daily) and GHCN-Daily via Access Data ServiceNOAA National Centers for Environmental Information · Official site

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

Climate normals are 30-year averages measured at one weather station, which may be miles from the place named here or at a different elevation.

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