TODAY NOV21
TEMPERATURE30
HUMIDITY69
PRESSURE
WIND COND.120 11.2
  • 3624Fri70%40%
  • 418Sat80%80%
  • 195Sun40%
  • 2911Mon
  • 3614Tue
daynightWeather update from Lewistown, Lewistown Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Lewistown for July is 68.6 degrees
  • The lowest monthly average temperature in Lewistown for December is 22.7 degrees
  • The most monthly precipitation in Lewistown occurs in May with 3.5 inches
  • The air quality index in Lewistown is 50% better than the national average
  • The pollution index in Lewistown is 90% better than the national average

Compare Lewistown, MT Weather

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      Lewistown 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
      January14°F36°F25°F0.6"
      February15°F38°F25°F0.5"
      March24°F48°F34°F0.8"
      April29°F55°F41°F2.0"
      May37°F64°F50°F3.5"
      June45°F73°F59°F3.4"
      July52°F85°F69°F1.5"
      August50°F83°F66°F1.8"
      September42°F73°F56°F1.5"
      October33°F59°F44°F1.7"
      November22°F46°F33°F0.8"
      December12°F34°F23°F0.5"

      Lewistown 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.
      IndexLewistownMontanaNational
      Air quality index213442
      Pollution index263,666834,4732,726,193

      Lewistown air quality

      MeasurementTotal
      Days measured363
      Days with good air quality350
      Days with moderate air quality12
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.005%
      Carbon Tetrachloride0.001%
      Lead0.010%
      Mercury0.000%

      Average monthly Lewistown temperature with heat index

      Lewistown monthly precipitation with daily maximum

      Lewistown monthly snow depth with daily maximum

      Lewistown monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Lewistown Heights, MT3122158.0%
      Moore, MT1872158.0%
      Lewistown, MT5,9232158.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Selinsgrove, PA5,9233530.0%
      Woods Creek, WA5,9224510.0%
      Old Tappan, NJ5,924512.0%
      Margate City, NJ5,9213726.0%
      Oxford, MA5,9264020.0%
      Lewistown, MT5,9232158.0%
      Source: The Lewistown, MT 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.