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Delafield city, Wisconsin

Official LSAD Designation: Delafield city • Census GEOID: 5519400 • Waukesha County

Climate Normals & Weather Observations

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

Reference Weather Station: OCONOMOWOC WWTP, WI US (ID: USC00476200) • Located 6.2 miles from community center • Elevation: 261.5 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 28.1° 11.1° 19.6° 1.65"
February 32.0° 14.0° 23.0° 1.61"
March 43.7° 24.6° 34.2° 2.10"
April 56.4° 35.8° 46.1° 3.86"
May 68.6° 47.2° 57.9° 4.14"
June 78.4° 57.0° 67.7° 4.86"
July 82.3° 61.2° 71.8° 4.12"
August 80.6° 59.7° 70.2° 4.17"
September 73.8° 51.6° 62.7° 3.39"
October 60.8° 39.8° 50.3° 2.83"
November 46.0° 28.6° 37.3° 2.21"
December 33.7° 18.0° 25.9° 1.87"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station OCONOMOWOC WWTP, WI US (ID: USC00476200) • 6.2 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 OCONOMOWOC WWTP, WI 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. 31.0 39.3 47.5 55.8 64.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 48.3°F 2011: Annual mean 47.2°F 2012: Annual mean 50.7°F 2013: Annual mean 45.1°F 2014: Annual mean 43.6°F 2015: Annual mean 47.5°F 2018: Annual mean 46.7°F 2022: Annual mean 46.6°F 2024: Annual mean 51.0°F 2025: Annual mean 48.3°F 2010: Annual mean of daily highs 58.2°F 2011: Annual mean of daily highs 56.6°F 2012: Annual mean of daily highs 61.0°F 2013: Annual mean of daily highs 54.8°F 2014: Annual mean of daily highs 53.2°F 2015: Annual mean of daily highs 57.3°F 2016: Annual mean of daily highs 58.5°F 2018: Annual mean of daily highs 56.1°F 2021: Annual mean of daily highs 58.8°F 2022: Annual mean of daily highs 56.2°F 2024: Annual mean of daily highs 60.7°F 2025: Annual mean of daily highs 58.4°F 2010: Annual mean of daily lows 38.4°F 2011: Annual mean of daily lows 37.8°F 2012: Annual mean of daily lows 40.4°F 2013: Annual mean of daily lows 35.4°F 2014: Annual mean of daily lows 34.1°F 2015: Annual mean of daily lows 37.7°F 2018: Annual mean of daily lows 37.2°F 2022: Annual mean of daily lows 37.0°F 2024: Annual mean of daily lows 41.3°F 2025: Annual mean of daily lows 38.1°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 48.3 58.2 38.4
2011 47.2 56.6 37.8
2012 50.7 61.0 40.4
2013 45.1 54.8 35.4
2014 43.6 53.2 34.1
2015 47.5 57.3 37.7
2016 Unavailable 58.5 Unavailable
2017 Unavailable Unavailable Unavailable
2018 46.7 56.1 37.2
2019 Unavailable Unavailable Unavailable
2020 Unavailable Unavailable Unavailable
2021 Unavailable 58.8 Unavailable
2022 46.6 56.2 37.0
2023 Unavailable Unavailable Unavailable
2024 51.0 60.7 41.3
2025 48.3 58.4 38.1
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.