Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 22°F | 38°F | 30°F | 1.7" |
February | 25°F | 40°F | 32°F | 2.3" |
March | 36°F | 54°F | 44°F | 1.1" |
April | 46°F | 67°F | 55°F | 4.3" |
May | 55°F | 76°F | 64°F | 0.0" |
June | 66°F | 86°F | 75°F | 3.0" |
July | 66°F | 86°F | 75°F | 7.9" |
August | 66°F | 87°F | 76°F | 4.8" |
September | 59°F | 81°F | 69°F | 8.6" |
October | 47°F | 69°F | 57°F | 1.4" |
November | 36°F | 56°F | 46°F | 11.8" |
December | 25°F | 38°F | 31°F | 7.1" |
Index | Herrick | Illinois | National |
Air quality index | 40 | 41 | 42 |
Pollution index | 1,561,310 | 3,148,694 | 2,726,193 |
Measurement | Total |
Days measured | 245 |
Days with good air quality | 224 |
Days with moderate air quality | 21 |
Days w/ poor A.Q. for sensitive groups | 0 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.001% |
Benzene | 0.040% |
Carbon Tetrachloride | 0.010% |
Lead | 0.002% |
Mercury | 0.002% |
City | Population | Air Quality Index | National Avg. |
Oconee, IL | 137 | 40 | 20.0% |
Tower Hill, IL | 643 | 40 | 20.0% |
Bingham, IL | 86 | 40 | 20.0% |
Ohlman, IL | 103 | 40 | 20.0% |
St. Elmo, IL | 1,466 | 40 | 20.0% |
Herrick, IL | 367 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
California Pines, CA | 367 | 29 | 42.0% |
Gardner, FL | 367 | 36 | 28.0% |
Quimby, IA | 367 | 35 | 30.0% |
Estral Beach, MI | 367 | 1 | 98.0% |
Summersville, MO | 367 | 39 | 22.0% |
Herrick, IL | 367 | 40 | 20.0% |