| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 15°F | 1.8" |
| February | 7°F | 27°F | 17°F | 1.0" |
| March | 19°F | 43°F | 31°F | 3.0" |
| April | 33°F | 60°F | 45°F | 2.9" |
| May | 46°F | 69°F | 57°F | 4.2" |
| June | 57°F | 82°F | 70°F | 6.4" |
| July | 58°F | 86°F | 72°F | 2.7" |
| August | 56°F | 83°F | 69°F | 4.2" |
| September | 52°F | 75°F | 63°F | 7.0" |
| October | 41°F | 62°F | 51°F | 8.2" |
| November | 26°F | 42°F | 34°F | 2.7" |
| December | 10°F | 26°F | 18°F | 1.8" |
| Index | Trego | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 1,459,610 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 38 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Shell Lake, WI | 1,405 | 34 | 32.0% |
| Stone Lake, WI | 115 | 34 | 32.0% |
| Minong, WI | 496 | 35 | 30.0% |
| Spooner, WI | 2,573 | 35 | 30.0% |
| Springbrook, WI | 40 | 35 | 30.0% |
| Trego, WI | 112 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Mulat, FL | 112 | 41 | 18.0% |
| Mitchell, GA | 112 | 47 | 6.0% |
| Goodell, IA | 112 | 15 | 70.0% |
| Walnut Hill, IL | 112 | 43 | 14.0% |
| Longford, KS | 112 | 32 | 36.0% |
| Trego, WI | 112 | 35 | 30.0% |
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