| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 27°F | 19°F | 0.4" |
| February | 13°F | 30°F | 21°F | 0.5" |
| March | 28°F | 45°F | 35°F | 1.5" |
| April | 39°F | 59°F | 48°F | 3.6" |
| May | 49°F | 71°F | 59°F | 3.7" |
| June | 60°F | 80°F | 69°F | 4.4" |
| July | 64°F | 84°F | 73°F | 3.6" |
| August | 62°F | 81°F | 70°F | 3.4" |
| September | 54°F | 74°F | 63°F | 2.4" |
| October | 42°F | 60°F | 50°F | 2.5" |
| November | 31°F | 46°F | 38°F | 0.9" |
| December | 18°F | 31°F | 24°F | 1.3" |
| Index | Gilmanton | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 1,672,670 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 305 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Waumandee, WI | 73 | 15 | 70.0% |
| Alma, WI | 658 | 15 | 70.0% |
| Independence, WI | 1,342 | 15 | 70.0% |
| Eleva, WI | 743 | 34 | 32.0% |
| Strum, WI | 1,143 | 34 | 32.0% |
| Gilmanton, WI | 122 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Nunam Iqua, AK | 122 | 31 | 38.0% |
| Pollard, AL | 122 | 41 | 18.0% |
| Pineville, AR | 122 | 36 | 28.0% |
| Whispering Pines, AZ | 122 | 60 | 20.0% |
| Gay, GA | 122 | 42 | 16.0% |
| Gilmanton, WI | 122 | 34 | 32.0% |
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