| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 27°F | 22°F | 1.8" |
| February | 15°F | 28°F | 22°F | 1.3" |
| March | 25°F | 44°F | 35°F | 2.8" |
| April | 36°F | 58°F | 48°F | 3.3" |
| May | 47°F | 70°F | 60°F | 3.6" |
| June | 59°F | 82°F | 71°F | 5.7" |
| July | 60°F | 84°F | 73°F | 10.3" |
| August | 59°F | 80°F | 70°F | 9.0" |
| September | 52°F | 75°F | 64°F | 5.5" |
| October | 44°F | 64°F | 54°F | 6.0" |
| November | 28°F | 44°F | 37°F | 2.3" |
| December | 11°F | 26°F | 19°F | 2.2" |
| Index | Friendship | 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. |
| Adams, WI | 2,159 | 35 | 30.0% |
| Grand Marsh, WI | 144 | 35 | 30.0% |
| Arkdale, WI | 171 | 35 | 30.0% |
| Oxford, WI | 542 | 35 | 30.0% |
| Mauston, WI | 4,354 | 35 | 30.0% |
| Friendship, WI | 653 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Somerville, AL | 653 | 41 | 18.0% |
| Bradford, AR | 653 | 45 | 10.0% |
| Cattle Creek, CO | 653 | 44 | 12.0% |
| Holiday Hills, IL | 653 | 39 | 22.0% |
| Cynthiana, IN | 653 | 45 | 10.0% |
| Friendship, WI | 653 | 35 | 30.0% |
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