TODAY AUG15
TEMPERATURE69
HUMIDITY91
PRESSURE29.93
WIND COND.180 3.4
  • 7867Wed70%60%
  • 8165Thu30%40%
  • 8264Fri20%30%
  • 8363Sat
  • 8466Sun
daynightWeather update from Morris Muni-James R Washburn Field Airport at

Seneca 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
January18°F33°F25°F3.9"
February18°F35°F26°F2.3"
March31°F50°F39°F4.3"
April40°F63°F50°F8.4"
May51°F74°F62°F6.0"
June61°F82°F71°F5.7"
July63°F84°F73°F9.0"
August62°F82°F71°F5.4"
September54°F77°F65°F3.7"
October44°F65°F53°F7.1"
November33°F51°F41°F4.0"
December22°F37°F29°F3.0"

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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Compare Seneca, IL Weather To Other Cities

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.
IndexSenecaIllinoisNational
Air quality index14150
Pollution index1,736,9303,347,2955,066,862

Seneca air quality information

MeasurementTotal
Days measured351
Days with good air quality351
Days with moderate air quality
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Seneca air quality information

PollutantTotal
Arsenic0.004%
Benzene0.040%
Carbon Tetrachloride0.000%
Lead0.001%
Mercury0.001%

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, StatePopulationAir Quality IndexNational Avg.
Dayton, IL520198%
Kinsman, IL85198%
Morris, IL13,930198%
Streator, IL13,163198%
Dwight, IL4,168198%
Seneca, IL2,565198%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Moscow Mills, MO2,5656020%
Park City, TN2,5653726%
Piermont, NY2,565536%
Clinton, AR2,5653432%
Lake Wazeecha, WI2,5653628%
Seneca, IL2,565198%
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.