Derby, CT Weather Forecast & Monthly Average Temperatures

TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.

Derby Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	21°F	37°F	28°F	5.0"
February	19°F	35°F	26°F	9.8"
March	25°F	44°F	34°F	6.0"
April	38°F	59°F	47°F	15.0"
May	46°F	68°F	56°F	14.6"
June	58°F	78°F	67°F	11.3"
July	62°F	81°F	70°F	12.6"
August	62°F	82°F	71°F	8.3"
September	55°F	76°F	65°F	2.3"
October	48°F	64°F	54°F	12.4"
November	34°F	51°F	41°F	5.2"
December	23°F	36°F	29°F	5.5"

Did you know?

The highest monthly average temperature in Derby for August is 71 degrees.
The lowest monthly average temperature in Derby for February is 26 degrees.
The most monthly precipitation in Derby occurs in April with 15 inches.
The air quality index in Derby is 1% better than the national average.
The pollution index in Derby is 186% worse than the national average.

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Derby 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.
Index	Derby	Connecticut	National
Air quality index	49	43	50
Pollution index	14,500,300	7,127,531	5,066,862

Derby air quality information

Measurement	Total
Days measured	365
Days with good air quality	194
Days with moderate air quality	161
Days w/ poor A.Q. for sensitive groups	10
Days with unhealthy air quality

Derby air quality information

Pollutant	Total
Arsenic	0.030%
Benzene	0.140%
Carbon Tetrachloride	0.050%
Lead	0.080%
Mercury	0.060%

Average monthly Derby temperature with heat index

Derby monthly precipitation with daily maximum

Derby monthly snow depth with daily maximum

Derby monthly wind speed information

Nearby cities with good air quality

City, State	Population	Air Quality Index	National Avg.
Meriden, CT	60,203	46	8%
Trumbull, CT	36,477	47	6%
Bridgeport, CT	147,022	47	6%
Newtown, CT	2,009	47	6%
Southport, CT	1,694	47	6%
Derby, CT	12,755	49	2%

Cities with similar population

City, State	Population	Air Quality Index	National Avg.
Kewanee, IL	12,755	48	4%
Auburn, IN	12,758	47	6%
St. Marys, PA	12,748	33	34%
Parker, SC	12,743	40	20%
Short Hills, NJ	12,771	53	6%
Derby, CT	12,755	49	2%

Source: The Derby, 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.