| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 26°F | 17°F | 0.1" |
| February | 11°F | 29°F | 20°F | 3.2" |
| March | 26°F | 44°F | 34°F | 2.7" |
| April | 38°F | 59°F | 48°F | 2.7" |
| May | 49°F | 71°F | 59°F | 3.9" |
| June | 59°F | 80°F | 69°F | 4.8" |
| July | 63°F | 85°F | 74°F | 3.7" |
| August | 61°F | 82°F | 71°F | 4.6" |
| September | 54°F | 75°F | 63°F | 2.9" |
| October | 41°F | 61°F | 50°F | 1.6" |
| November | 30°F | 46°F | 37°F | 1.0" |
| December | 15°F | 29°F | 22°F | 0.0" |
| Index | Nelson | Wisconsin | National |
| Air quality index | 15 | 69 | 42 |
| Pollution index | 830,810 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 57 |
| Days with good air quality | 53 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cochrane, WI | 452 | 15 | 70.0% |
| Alma, WI | 658 | 15 | 70.0% |
| Waumandee, WI | 73 | 15 | 70.0% |
| Buffalo City, WI | 822 | 15 | 70.0% |
| Kellogg, MN | 432 | 15 | 70.0% |
| Nelson, WI | 311 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Waucoma, IA | 311 | 39 | 22.0% |
| Plevna, MT | 311 | 33 | 34.0% |
| Macclesfield, NC | 311 | 36 | 28.0% |
| Bridgeville, NJ | 311 | 34 | 32.0% |
| Rosewood, OH | 311 | 45 | 10.0% |
| Nelson, WI | 311 | 15 | 70.0% |
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