Seneca, IL Weather Forecast & Monthly Average Temperatures

TEMPERATURE	37
HUMIDITY	69
PRESSURE	30.04
WIND COND.	270 9.2

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Seneca 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	18°F	33°F	25°F	3.9"
February	18°F	35°F	26°F	2.3"
March	31°F	50°F	39°F	4.3"
April	40°F	63°F	50°F	8.4"
May	51°F	74°F	62°F	6.0"
June	61°F	82°F	71°F	5.7"
July	63°F	84°F	73°F	9.0"
August	62°F	82°F	71°F	5.4"
September	54°F	77°F	65°F	3.7"
October	44°F	65°F	53°F	7.1"
November	33°F	51°F	41°F	4.0"
December	22°F	37°F	29°F	3.0"

Did you know?

The highest monthly average temperature in Seneca for July is 73 degrees.
The lowest monthly average temperature in Seneca for January is 25 degrees.
The most monthly precipitation in Seneca occurs in July with 9 inches.
The air quality index in Seneca is 97% better than the national average.
The pollution index in Seneca is 65% better than the national average.

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Seneca 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	Seneca	Illinois	National
Air quality index	1	41	50
Pollution index	1,736,930	3,347,295	5,066,862

Seneca air quality information

Measurement	Total
Days measured	351
Days with good air quality	351
Days with moderate air quality
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Seneca air quality information

Pollutant	Total
Arsenic	0.004%
Benzene	0.040%
Carbon Tetrachloride	0.000%
Lead	0.001%
Mercury	0.001%

Average monthly Seneca temperature with heat index

Seneca monthly precipitation with daily maximum

Seneca monthly snow depth with daily maximum

Seneca monthly wind speed information

Nearby cities with good air quality

City, State	Population	Air Quality Index	National Avg.
Mazon, IL	957	1	98%
Ransom, IL	347	1	98%
Kangley, IL	258	1	98%
Morris, IL	13,930	1	98%
Streator, IL	13,163	1	98%
Seneca, IL	2,565	1	98%

Cities with similar population

City, State	Population	Air Quality Index	National Avg.
Lake Wazeecha, WI	2,565	36	28%
Lake Wynonah, PA	2,565	45	10%
Warm Beach, WA	2,565	31	38%
Clinton, AR	2,565	34	32%
Park City, TN	2,565	37	26%
Seneca, IL	2,565	1	98%

Source: The Seneca, 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.