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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 28°F | 21°F | 3.6" |
| February | 14°F | 30°F | 22°F | 1.7" |
| March | 26°F | 45°F | 35°F | 3.4" |
| April | 37°F | 59°F | 47°F | 6.3" |
| May | 47°F | 71°F | 59°F | 5.1" |
| June | 57°F | 79°F | 68°F | 7.3" |
| July | 61°F | 83°F | 72°F | 3.8" |
| August | 59°F | 81°F | 70°F | 5.7" |
| September | 51°F | 74°F | 62°F | 4.6" |
| October | 41°F | 61°F | 50°F | 6.5" |
| November | 30°F | 47°F | 38°F | 4.2" |
| December | 18°F | 33°F | 25°F | 3.3" |
| Index | Watertown | Wisconsin | National |
| Air quality index | 37 | 69 | 42 |
| Pollution index | 2,796,310 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 203 |
| Days with good air quality | 191 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.001% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Lebanon, WI | 98 | 37 | 26.0% |
| Helenville, WI | 245 | 37 | 26.0% |
| Rome, WI | 647 | 37 | 26.0% |
| Dousman, WI | 2,116 | 37 | 26.0% |
| Cambridge, WI | 1,260 | 37 | 26.0% |
| Watertown, WI | 23,561 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Jacksonville Beach, FL | 23,562 | 43 | 14.0% |
| Fish Hawk, FL | 23,556 | 43 | 14.0% |
| Ashland, CA | 23,566 | 40 | 20.0% |
| West Puente Valley, CA | 23,555 | 72 | 44.0% |
| Belton, MO | 23,568 | 47 | 6.0% |
| Watertown, WI | 23,561 | 37 | 26.0% |
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