| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 26°F | 19°F | 2.7" |
| February | 16°F | 31°F | 23°F | 1.6" |
| March | 29°F | 46°F | 37°F | 4.7" |
| April | 38°F | 57°F | 46°F | 5.4" |
| May | 50°F | 71°F | 60°F | 7.0" |
| June | 59°F | 80°F | 69°F | 8.8" |
| July | 65°F | 86°F | 75°F | 10.2" |
| August | 60°F | 82°F | 70°F | 9.0" |
| September | 50°F | 70°F | 59°F | 5.6" |
| October | 42°F | 61°F | 50°F | 3.8" |
| November | 30°F | 47°F | 37°F | 2.8" |
| December | 18°F | 30°F | 24°F | 2.5" |
| Index | Westby | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 2,073,170 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 310 |
| Days with moderate air quality | 55 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Coon Valley, WI | 937 | 35 | 30.0% |
| Ontario, WI | 477 | 35 | 30.0% |
| Viroqua, WI | 4,472 | 35 | 30.0% |
| La Farge, WI | 930 | 35 | 30.0% |
| Readstown, WI | 418 | 35 | 30.0% |
| Westby, WI | 2,387 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Horse Cave, KY | 2,387 | 43 | 14.0% |
| Warson Woods, MO | 2,387 | 54 | 8.0% |
| Sylvania, AL | 2,386 | 39 | 22.0% |
| Antlers, OK | 2,386 | 325 | 550.0% |
| Richland, MO | 2,388 | 39 | 22.0% |
| Westby, WI | 2,387 | 35 | 30.0% |
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