Johnston, IA Weather - Forecast & Monthly Averages

TEMPERATURE	55
HUMIDITY	62
PRESSURE	102810
WIND COND.	5.4

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Weather Quick Facts

The highest monthly average temperature in Johnston for July is 77.4 degrees
The lowest monthly average temperature in Johnston for January is 23.5 degrees
The most monthly precipitation in Johnston occurs in June with 6.5 inches
The air quality index in Johnston is 7% better than the national average
The pollution index in Johnston is 242% worse than the national average

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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.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	14°F	35°F	23°F	0.9"
February	17°F	39°F	26°F	1.2"
March	30°F	54°F	41°F	2.2"
April	41°F	67°F	53°F	4.9"
May	51°F	76°F	63°F	4.9"
June	62°F	86°F	74°F	6.5"
July	66°F	89°F	77°F	4.2"
August	64°F	87°F	75°F	5.1"
September	56°F	81°F	68°F	3.7"
October	43°F	68°F	55°F	3.2"
November	31°F	54°F	42°F	1.8"
December	18°F	38°F	27°F	2.1"

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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.
Index	Johnston	Iowa	National
Air quality index	39	39	42
Pollution index	9,310,160	1,154,535	2,726,193

Johnston air quality

Measurement	Total
Days measured	365
Days with good air quality	306
Days with moderate air quality	59
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.010%
Benzene	0.110%
Carbon Tetrachloride	0.080%
Lead	0.030%
Mercury	0.010%

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	Population	Air Quality Index	National Avg.
Sheldahl, IA	337	37	26.0%
Slater, IA	1,463	37	26.0%
Madrid, IA	2,570	37	26.0%
Alleman, IA	438	37	26.0%
Huxley, IA	3,912	37	26.0%
Johnston, IA	22,077	39	22.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Corcoran, CA	22,078	56	12.0%
Huntsville, ON	22,073	n/a
Nixa, MO	22,086	39	22.0%
Villa Park, IL	22,087	55	10.0%
Chester, VA	22,098	44	12.0%
Johnston, IA	22,077	39	22.0%

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.