St. Johns, IL Weather - Forecast & Monthly Averages

TEMPERATURE	63
HUMIDITY	52
PRESSURE	102410
WIND COND.	10 13

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Weather Quick Facts

The highest monthly average temperature in St. Johns for July is 77.9 degrees
The lowest monthly average temperature in St. Johns for January is 33.8 degrees
The most monthly precipitation in St. Johns occurs in April with 6.2 inches
The air quality index in St. Johns is 2% worse than the national average
The pollution index in St. Johns is 79% better than the national average

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St. Johns 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	25°F	44°F	34°F	2.3"
February	27°F	46°F	36°F	2.5"
March	38°F	60°F	48°F	4.8"
April	47°F	70°F	58°F	6.2"
May	56°F	78°F	67°F	4.9"
June	66°F	88°F	76°F	4.1"
July	68°F	89°F	78°F	5.0"
August	66°F	88°F	76°F	3.5"
September	57°F	81°F	68°F	3.4"
October	46°F	71°F	58°F	3.6"
November	36°F	58°F	46°F	3.7"
December	30°F	47°F	38°F	3.7"

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St. Johns 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	St. Johns	Illinois	National
Air quality index	43	41	42
Pollution index	569,178	3,148,694	2,726,193

St. Johns air quality

Measurement	Total
Days measured	344
Days with good air quality	269
Days with moderate air quality	74
Days w/ poor A.Q. for sensitive groups	1
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.001%
Benzene	0.020%
Carbon Tetrachloride	0.000%
Lead	0.000%
Mercury	0.000%

Average monthly St. Johns temperature with heat index

St. Johns monthly precipitation with daily maximum

St. Johns monthly snow depth with daily maximum

St. Johns monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Elkville, IL	796	43	14.0%
Vergennes, IL	238	43	14.0%
Freeman Spur, IL	269	43	14.0%
Tamaroa, IL	740	43	14.0%
Nason, IL	221	43	14.0%
St. Johns, IL	160	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Tomales, CA	160	34	32.0%
Dewy Rose, GA	160	44	12.0%
Alexander, IA	160	15	70.0%
Andover, IA	160	42	16.0%
Stockton, IA	160	46	8.0%
St. Johns, IL	160	43	14.0%

Source: The St. Johns, IL 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.