| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 27°F | 20°F | 2.0" |
| February | 14°F | 29°F | 21°F | 2.4" |
| March | 27°F | 44°F | 34°F | 4.7" |
| April | 37°F | 57°F | 46°F | 6.9" |
| May | 48°F | 69°F | 57°F | 5.9" |
| June | 57°F | 78°F | 67°F | 8.3" |
| July | 61°F | 81°F | 70°F | 6.6" |
| August | 60°F | 79°F | 69°F | 4.8" |
| September | 52°F | 73°F | 62°F | 7.0" |
| October | 41°F | 60°F | 50°F | 5.5" |
| November | 30°F | 46°F | 37°F | 4.1" |
| December | 18°F | 32°F | 25°F | 2.6" |
| Index | Horicon | Wisconsin | National |
| Air quality index | 40 | 69 | 42 |
| Pollution index | 1,701,810 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 297 |
| Days with moderate air quality | 67 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Brownsville, WI | 692 | 36 | 28.0% |
| Lomira, WI | 2,361 | 36 | 28.0% |
| Theresa, WI | 1,199 | 36 | 28.0% |
| Hartford, WI | 15,228 | 37 | 26.0% |
| Hustisford, WI | 994 | 37 | 26.0% |
| Horicon, WI | 3,630 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Barnegat, NJ | 3,630 | 37 | 26.0% |
| Hazel Green, AL | 3,629 | 44 | 12.0% |
| Pine Island, MN | 3,629 | 36 | 28.0% |
| Lyman, SC | 3,629 | 44 | 12.0% |
| St. Theresa Point, MB | 3,629 | n/a | |
| Horicon, WI | 3,630 | 40 | 20.0% |
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