TODAY AUG21
TEMPERATURE50
HUMIDITY86
PRESSURE30.32
WIND COND.
  • 6544Tue20%
  • 8052Wed
  • 8252Thu
  • 7846Fri
  • 7547Sat
daynightWeather update from Lewistown, Lewistown Municipal Airport at

Lewistown Average Weather

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"

Did you know?

  • The highest monthly average temperature in Lewistown for July is 69 degrees.
  • The lowest monthly average temperature in Lewistown for December is 23 degrees.
  • The most monthly precipitation in Lewistown occurs in May with 3.5 inches.
  • The air quality index in Lewistown is 47% better than the national average.
  • The pollution index in Lewistown is 94% better than the national average.

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Compare Lewistown, MT Weather To Other Cities

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 index263450
Pollution index263,666685,9255,066,862

Lewistown air quality information

MeasurementTotal
Days measured337
Days with good air quality311
Days with moderate air quality26
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Lewistown air quality information

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

City, StatePopulationAir Quality IndexNational Avg.
Lewistown Heights, MT7092648%
Moore, MT1972648%
Lewistown, MT5,8682648%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Fishhook, AK5,8662942%
Scenic Oaks, TX5,8704510%
Chesapeake Beach, MD5,8663726%
Plymouth, PA5,8654020%
Yoakum, TX5,8652746%
Lewistown, MT5,8682648%
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.