| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 27°F | 19°F | 1.8" |
| February | 13°F | 30°F | 21°F | 1.8" |
| March | 25°F | 45°F | 34°F | 4.2" |
| April | 36°F | 58°F | 46°F | 6.0" |
| May | 47°F | 70°F | 58°F | 4.7" |
| June | 57°F | 78°F | 67°F | 9.0" |
| July | 60°F | 83°F | 71°F | 5.9" |
| August | 59°F | 80°F | 69°F | 7.4" |
| September | 51°F | 73°F | 61°F | 5.8" |
| October | 41°F | 60°F | 49°F | 5.8" |
| November | 29°F | 46°F | 37°F | 4.1" |
| December | 17°F | 31°F | 24°F | 2.7" |
| Index | Portage | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 1,548,770 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 311 |
| Days with moderate air quality | 53 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Merrimac, WI | 672 | 35 | 30.0% |
| Packwaukee, WI | 194 | 35 | 30.0% |
| Baraboo, WI | 12,133 | 35 | 30.0% |
| Pardeeville, WI | 2,046 | 35 | 30.0% |
| Endeavor, WI | 562 | 35 | 30.0% |
| Portage, WI | 10,412 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Cape Canaveral, FL | 10,411 | 36 | 28.0% |
| Monmouth, OR | 10,411 | 32 | 36.0% |
| Mono, ON | 10,413 | n/a | |
| Frederick, CO | 10,414 | 47 | 6.0% |
| Oak Hills, CA | 10,415 | 89 | 78.0% |
| Portage, WI | 10,412 | 35 | 30.0% |
Here are the best places to live in Wisconsin
10 Best cities in Wisconsin for employment
Check out the 10 safest cities in Wisconsin
Top 10 best public schools in Portage