| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 0.8" |
| February | 25°F | 43°F | 33°F | 0.6" |
| March | 33°F | 52°F | 41°F | 3.0" |
| April | 42°F | 63°F | 52°F | 3.6" |
| May | 50°F | 72°F | 61°F | 4.5" |
| June | 62°F | 84°F | 73°F | 5.6" |
| July | 65°F | 83°F | 74°F | 8.8" |
| August | 62°F | 81°F | 71°F | 5.3" |
| September | 57°F | 80°F | 68°F | 3.4" |
| October | 48°F | 68°F | 57°F | 4.2" |
| November | 33°F | 52°F | 42°F | 0.9" |
| December | 18°F | 33°F | 25°F | 0.9" |
| Index | Blue Grass | Iowa | National |
| Air quality index | 46 | 39 | 42 |
| Pollution index | 4,003,130 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 217 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.170% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.110% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Durant, IA | 1,878 | 32 | 36.0% |
| Wilton, IA | 2,845 | 32 | 36.0% |
| Andalusia, IL | 1,118 | 46 | 8.0% |
| Sherrard, IL | 628 | 46 | 8.0% |
| Long Grove, IA | 893 | 46 | 8.0% |
| Blue Grass, IA | 2,058 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Adrian, MO | 2,058 | 47 | 6.0% |
| Malta, MT | 2,058 | 21 | 58.0% |
| Greenport, NY | 2,058 | 41 | 18.0% |
| Newkirk, OK | 2,058 | 40 | 20.0% |
| Palmyra, WI | 2,058 | 37 | 26.0% |
| Blue Grass, IA | 2,058 | 46 | 8.0% |
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