| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 29°F | 20°F | 1.0" |
| February | 13°F | 32°F | 22°F | 0.8" |
| March | 26°F | 47°F | 36°F | 2.2" |
| April | 37°F | 61°F | 48°F | 4.5" |
| May | 48°F | 73°F | 60°F | 3.2" |
| June | 59°F | 82°F | 69°F | 6.3" |
| July | 62°F | 85°F | 73°F | 4.5" |
| August | 60°F | 82°F | 70°F | 4.5" |
| September | 52°F | 76°F | 63°F | 3.3" |
| October | 41°F | 63°F | 51°F | 2.4" |
| November | 29°F | 49°F | 38°F | 1.8" |
| December | 16°F | 33°F | 24°F | 1.5" |
| Index | Plain | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 2,327,750 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 311 |
| Days with moderate air quality | 53 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Avoca, WI | 582 | 29 | 42.0% |
| Lone Rock, WI | 835 | 35 | 30.0% |
| Bluffview, WI | 731 | 35 | 30.0% |
| Arena, WI | 775 | 35 | 30.0% |
| Gotham, WI | 213 | 35 | 30.0% |
| Plain, WI | 681 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Junction City, AR | 681 | 35 | 30.0% |
| Lizton, IN | 681 | 54 | 8.0% |
| Mangham, LA | 681 | 34 | 32.0% |
| LaMoure, ND | 681 | 20 | 60.0% |
| Milnor, ND | 681 | 33 | 34.0% |
| Plain, WI | 681 | 35 | 30.0% |
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