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Derby city, Connecticut

Official LSAD Designation: Derby city • Census GEOID: 0919480 • Naugatuck Valley Planning Region

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Derby city.

Reference Weather Station: ANSONIA 1 NE, CT US (ID: USC00060128) • Located 1.7 miles from community center • Elevation: 41.5 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 36.0° 18.4° 27.2° 3.95"
February 38.1° 18.9° 28.5° 3.62"
March 46.8° 27.4° 37.1° 4.72"
April 58.2° 37.5° 47.9° 4.72"
May 69.0° 47.2° 58.1° 4.04"
June 77.3° 57.9° 67.6° 3.93"
July 82.0° 63.1° 72.6° 4.30"
August 82.0° 62.1° 72.1° 4.56"
September 75.0° 53.6° 64.3° 4.38"
October 63.3° 41.2° 52.3° 5.00"
November 51.6° 32.0° 41.8° 4.24"
December 41.2° 23.3° 32.3° 4.57"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station ANSONIA 1 NE, CT US (ID: USC00060128) • 1.7 miles from community center .

This is the same reference station used for monthly normals.

Annual mean Annual mean of daily highs Annual mean of daily lows
Annual temperature history at ANSONIA 1 NE, CT US Year is the horizontal axis. Annual mean temperature in degrees Fahrenheit is the vertical axis. Dots show recorded years; lines connect consecutive available years only. Missing years are gaps, with no interpolation. Optional dashed lines show annual mean of daily highs and lows. Exact values appear in the data table below. 37.0 43.3 49.5 55.8 62.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2013: Annual mean 49.6°F 2013: Annual mean of daily highs 59.4°F 2013: Annual mean of daily lows 39.8°F

Source: NOAA NCEI Global Summary of the Year.

Annual temperature data table (°F)
Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year Annual mean (°F) Annual mean of daily highs (°F) Annual mean of daily lows (°F)
2010 Unavailable Unavailable Unavailable
2011 Unavailable Unavailable Unavailable
2012 Unavailable Unavailable Unavailable
2013 49.6 59.4 39.8
2014 Unavailable Unavailable Unavailable
2015 Unavailable Unavailable Unavailable
2016 Unavailable Unavailable Unavailable
2017 Unavailable Unavailable Unavailable
2018 Unavailable Unavailable Unavailable
2019 Unavailable Unavailable Unavailable
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable Unavailable
2022 Unavailable Unavailable Unavailable
2023 Unavailable Unavailable Unavailable
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.