| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 15°F | 1.9" |
| February | 8°F | 27°F | 17°F | 2.2" |
| March | 23°F | 42°F | 32°F | 2.7" |
| April | 35°F | 56°F | 45°F | 4.8" |
| May | 46°F | 69°F | 57°F | 5.7" |
| June | 56°F | 77°F | 66°F | 7.1" |
| July | 60°F | 82°F | 71°F | 6.2" |
| August | 58°F | 79°F | 68°F | 8.5" |
| September | 51°F | 72°F | 61°F | 6.4" |
| October | 39°F | 58°F | 48°F | 6.7" |
| November | 27°F | 44°F | 35°F | 4.8" |
| December | 13°F | 27°F | 20°F | 3.3" |
| Index | Houlton | Wisconsin | National |
| Air quality index | 46 | 69 | 42 |
| Pollution index | 2,108,790 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 148 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Roberts, WI | 1,849 | 37 | 26.0% |
| St. Marys Point, MN | 440 | 37 | 26.0% |
| River Falls, WI | 15,870 | 37 | 26.0% |
| Forest Lake, MN | 20,393 | 46 | 8.0% |
| Lake Elmo, MN | 9,071 | 46 | 8.0% |
| Houlton, WI | 105 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Buckeye, IA | 105 | 37 | 26.0% |
| Tingley, IA | 105 | 39 | 22.0% |
| Unionville, IA | 105 | 39 | 22.0% |
| Lima, IL | 105 | 41 | 18.0% |
| Raglesville, IN | 105 | 1 | 98.0% |
| Houlton, WI | 105 | 46 | 8.0% |
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