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Darien Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January23°F39°F30°F3.0"
February23°F40°F31°F2.6"
March30°F49°F39°F3.5"
April41°F62°F50°F4.2"
May50°F71°F60°F4.2"
June60°F79°F69°F5.1"
July66°F84°F74°F4.4"
August64°F82°F72°F4.2"
September57°F77°F66°F4.3"
October47°F65°F55°F5.1"
November37°F54°F45°F3.1"
December29°F44°F36°F4.5"

Did you know?

  • The highest monthly average temperature in Darien for July is 74 degrees.
  • The lowest monthly average temperature in Darien for January is 30 degrees.
  • The most monthly precipitation in Darien occurs in June with 5.1 inches.
  • The air quality index in Darien is 5% better than the national average.
  • The pollution index in Darien is 234% worse than the national average.

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Compare Darien, CT Weather To Other Cities

Darien air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexDarienConnecticutNational
Air quality index474350
Pollution index16,950,7007,127,5315,066,862

Darien air quality information

MeasurementTotal
Days measured365
Days with good air quality200
Days with moderate air quality146
Days w/ poor A.Q. for sensitive groups18
Days with unhealthy air quality1

Darien air quality information

PollutantTotal
Arsenic0.030%
Benzene0.140%
Carbon Tetrachloride0.070%
Lead0.080%
Mercury0.030%

Average monthly Darien temperature with heat index

Darien monthly precipitation with daily maximum

Darien monthly snow depth with daily maximum

Darien monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Bedford Hills, NY3,416476%
Cold Spring Harbor, NY5,055476%
Katonah, NY2,077476%
Laurel Hollow, NY1,929476%
Northport, NY7,393476%
Darien, CT21,519476%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Allison Park, PA21,5155612%
Midlothian, TX21,530548%
Roselle, NJ21,507536%
South Lake Tahoe, CA21,5063334%
Lakeside, CA21,4886122%
Darien, CT21,519476%
Source: The Darien, CT weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.