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Watertown CDP, Connecticut

Official LSAD Designation: Watertown CDP • Census GEOID: 0980420 • Naugatuck Valley Planning Region

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Watertown CDP.

Reference Weather Station: MERIDEN MARKHAM MUNI AP, CT US (ID: USW00054788) • Located 16.5 miles from community center • Elevation: 31.4 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 37.0° 18.7° 27.9° 3.05"
February 39.1° 20.2° 29.7° 2.93"
March 47.5° 28.2° 37.8° 4.05"
April 59.9° 37.8° 48.8° 4.13"
May 70.4° 47.8° 59.1° 3.48"
June 78.7° 57.0° 67.9° 4.05"
July 84.0° 62.5° 73.3° 3.38"
August 82.4° 61.1° 71.7° 3.54"
September 75.4° 53.6° 64.5° 4.28"
October 63.6° 41.8° 52.7° 4.49"
November 52.0° 32.1° 42.0° 3.36"
December 41.7° 24.5° 33.1° 4.12"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station MERIDEN MARKHAM MUNI AP, CT US (ID: USW00054788) • 16.5 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 MERIDEN MARKHAM MUNI AP, 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 44.5 52.0 59.5 67.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 52.3°F 2011: Annual mean 51.7°F 2012: Annual mean 53.1°F 2013: Annual mean 50.6°F 2015: Annual mean 51.2°F 2016: Annual mean 53.4°F 2017: Annual mean 51.6°F 2018: Annual mean 51.4°F 2019: Annual mean 50.9°F 2021: Annual mean 52.4°F 2022: Annual mean 52.0°F 2023: Annual mean 53.1°F 2010: Annual mean of daily highs 62.9°F 2011: Annual mean of daily highs 62.1°F 2012: Annual mean of daily highs 63.4°F 2013: Annual mean of daily highs 60.9°F 2015: Annual mean of daily highs 62.3°F 2016: Annual mean of daily highs 64.4°F 2017: Annual mean of daily highs 61.7°F 2018: Annual mean of daily highs 61.0°F 2019: Annual mean of daily highs 60.8°F 2021: Annual mean of daily highs 62.4°F 2022: Annual mean of daily highs 62.8°F 2023: Annual mean of daily highs 63.4°F 2010: Annual mean of daily lows 41.6°F 2011: Annual mean of daily lows 41.3°F 2012: Annual mean of daily lows 42.8°F 2013: Annual mean of daily lows 40.4°F 2015: Annual mean of daily lows 40.1°F 2016: Annual mean of daily lows 42.4°F 2017: Annual mean of daily lows 41.4°F 2018: Annual mean of daily lows 41.7°F 2019: Annual mean of daily lows 40.9°F 2021: Annual mean of daily lows 42.4°F 2022: Annual mean of daily lows 41.3°F 2023: Annual mean of daily lows 42.9°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 52.3 62.9 41.6
2011 51.7 62.1 41.3
2012 53.1 63.4 42.8
2013 50.6 60.9 40.4
2014 Unavailable Unavailable Unavailable
2015 51.2 62.3 40.1
2016 53.4 64.4 42.4
2017 51.6 61.7 41.4
2018 51.4 61.0 41.7
2019 50.9 60.8 40.9
2020 Unavailable Unavailable Unavailable
2021 52.4 62.4 42.4
2022 52.0 62.8 41.3
2023 53.1 63.4 42.9
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.