| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 25°F | 16°F | 0.6" |
| February | 9°F | 28°F | 18°F | 0.4" |
| March | 22°F | 42°F | 31°F | 1.2" |
| April | 33°F | 56°F | 44°F | 2.2" |
| May | 45°F | 69°F | 56°F | 3.2" |
| June | 54°F | 77°F | 65°F | 5.0" |
| July | 58°F | 82°F | 70°F | 3.1" |
| August | 57°F | 79°F | 67°F | 4.4" |
| September | 48°F | 71°F | 59°F | 3.5" |
| October | 38°F | 57°F | 47°F | 2.7" |
| November | 26°F | 43°F | 34°F | 1.4" |
| December | 14°F | 28°F | 21°F | 1.6" |
| Index | Nelsonville | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 2,448,720 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 205 |
| Days with good air quality | 196 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.140% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Polonia, WI | 636 | 34 | 32.0% |
| Bancroft, WI | 540 | 34 | 32.0% |
| Big Falls, WI | 134 | 34 | 32.0% |
| Rosholt, WI | 486 | 34 | 32.0% |
| Amherst, WI | 974 | 34 | 32.0% |
| Nelsonville, WI | 146 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Chinese Camp, CA | 146 | 39 | 22.0% |
| Sharpsburg, IA | 146 | 43 | 14.0% |
| Harmon, IL | 146 | 42 | 16.0% |
| Hettick, IL | 146 | 40 | 20.0% |
| Stoy, IL | 146 | 36 | 28.0% |
| Nelsonville, WI | 146 | 34 | 32.0% |
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