TODAY DEC17
TEMPERATURE23
HUMIDITY93
PRESSURE30.29
WIND COND.
  • 4528
  • 4935Tue
  • 4733Wed20%40%
  • 4025Thu
  • 3724Fri
daynightWeather update from Ankeny, Ankeny Regional Airport at

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Johnston 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°F35°F23°F0.9"
February17°F39°F26°F1.2"
March30°F54°F41°F2.2"
April41°F67°F53°F4.9"
May51°F76°F63°F4.9"
June62°F86°F74°F6.5"
July66°F89°F77°F4.2"
August64°F87°F75°F5.1"
September56°F81°F68°F3.7"
October43°F68°F55°F3.2"
November31°F54°F42°F1.8"
December18°F38°F27°F2.1"

Did you know?

  • The highest monthly average temperature in Johnston for July is 77 degrees.
  • The lowest monthly average temperature in Johnston for January is 23 degrees.
  • The most monthly precipitation in Johnston occurs in June with 6.5 inches.
  • The air quality index in Johnston is 17% better than the national average.
  • The pollution index in Johnston is 83% worse than the national average.

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Compare Johnston, IA Weather To Other Cities

Johnston 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.
IndexJohnstonIowaNational
Air quality index413950
Pollution index9,310,1601,643,8365,066,862

Johnston air quality information

MeasurementTotal
Days measured365
Days with good air quality267
Days with moderate air quality98
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Johnston air quality information

PollutantTotal
Arsenic0.010%
Benzene0.110%
Carbon Tetrachloride0.080%
Lead0.030%
Mercury0.010%

Average monthly Johnston temperature with heat index

Johnston monthly precipitation with daily maximum

Johnston monthly snow depth with daily maximum

Johnston monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Sheldahl, IA2493726%
Slater, IA1,6173726%
Alleman, IA4993726%
Huxley, IA3,4743726%
Madrid, IA2,5853726%
Johnston, IA19,4914118%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Payson, UT19,480476%
Allendale, MI19,4753922%
Sand Springs, OK19,509484%
Mead Valley, CA19,4688570%
Langley Park, MD19,517492%
Johnston, IA19,4914118%
Source: The Johnston, IA 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.