| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 28°F | 19°F | 1.7" |
| February | 11°F | 31°F | 21°F | 1.0" |
| March | 22°F | 43°F | 32°F | 1.7" |
| April | 34°F | 58°F | 45°F | 3.2" |
| May | 45°F | 71°F | 57°F | 3.5" |
| June | 55°F | 80°F | 67°F | 4.0" |
| July | 59°F | 84°F | 71°F | 4.2" |
| August | 57°F | 81°F | 69°F | 3.6" |
| September | 49°F | 75°F | 61°F | 3.4" |
| October | 39°F | 61°F | 50°F | 3.1" |
| November | 29°F | 48°F | 38°F | 2.1" |
| December | 16°F | 32°F | 24°F | 2.1" |
| Index | Seymour CDP | Wisconsin | National |
| Air quality index | 37 | 69 | 42 |
| Pollution index | 1,864,330 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 59 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.070% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| De Pere, WI | 25,009 | 36 | 28.0% |
| Suamico, WI | 12,890 | 36 | 28.0% |
| Pulaski, WI | 3,492 | 36 | 28.0% |
| Allouez, WI | 13,853 | 36 | 28.0% |
| Angelica, WI | 93 | 36 | 28.0% |
| Seymour CDP, WI | 1,626 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Canyon Day, AZ | 1,626 | 44 | 12.0% |
| Crystal Falls, MI | 1,626 | 8 | 84.0% |
| Glouster, OH | 1,626 | 25 | 50.0% |
| Three Way, TN | 1,626 | 27 | 46.0% |
| Ronceverte, WV | 1,626 | 41 | 18.0% |
| Seymour CDP, WI | 1,626 | 37 | 26.0% |
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