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" |
Index | St. Johns | Illinois | National |
Air quality index | 43 | 41 | 42 |
Pollution index | 569,178 | 3,148,694 | 2,726,193 |
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 |
Pollutant | Total |
Arsenic | 0.001% |
Benzene | 0.020% |
Carbon Tetrachloride | 0.000% |
Lead | 0.000% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Dowell, IL | 356 | 43 | 14.0% |
Royalton, IL | 1,107 | 43 | 14.0% |
Bush, IL | 303 | 43 | 14.0% |
Sesser, IL | 1,702 | 43 | 14.0% |
Valier, IL | 731 | 43 | 14.0% |
St. Johns, IL | 160 | 43 | 14.0% |
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% |