TODAY JUN23
TEMPERATURE57
HUMIDITY82
PRESSURE29.98
WIND COND.180 9.4
  • 766330%
  • 7767Thu70%70%
  • 7961Fri90%70%
  • 7458Sat60%50%
  • 7858Sun30%30%
daynightWeather update from Waukesha County Airport at

Key findings

  • The highest monthly average temperature in Merton for July is 70.3 degrees
  • The lowest monthly average temperature in Merton for January is 20.8 degrees
  • The most monthly precipitation in Merton occurs in June with 19.6 inches
  • The air quality index in Merton is 12% better than the national average
  • The pollution index in Merton is 60% better than the national average

Compare Merton, WI Weather

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      Merton Average Temperature

      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
      January15°F28°F21°F0.6"
      February15°F29°F22°F2.8"
      March27°F43°F34°F2.9"
      April37°F55°F45°F3.1"
      May47°F67°F56°F8.9"
      June56°F76°F66°F19.6"
      July61°F80°F70°F14.9"
      August60°F78°F69°F2.3"
      September53°F72°F61°F10.4"
      October42°F59°F50°F6.6"
      November31°F46°F38°F3.6"
      December20°F32°F26°F1.8"

      Merton 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.
      IndexMertonWisconsinNational
      Air quality index446950
      Pollution index2,032,3703,316,8775,066,862

      Merton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality254
      Days with moderate air quality108
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality0

      Merton air quality information

      PollutantTotal
      Arsenic0.002%
      Benzene0.030%
      Carbon Tetrachloride0.001%
      Lead0.000%
      Mercury0.002%

      Average monthly Merton temperature with heat index

      Merton monthly precipitation with daily maximum

      Merton monthly snow depth with daily maximum

      Merton monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Oconomowoc Lake, WI5473726%
      Ixonia, WI1,6793726%
      Delafield, WI7,2183726%
      Ashippun, WI3153726%
      Okauchee Lake, WI4,3003726%
      Merton, WI3,5354412%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Hominy, OK3,5354510%
      Ranlo, NC3,5353628%
      Warsaw, NY3,5363922%
      Bardonia, NY3,536512%
      Marshall, IL3,5364510%
      Merton, WI3,5354412%
      Source: The Merton, WI 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.