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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 30°F | 20°F | 1.5" |
| February | 13°F | 33°F | 23°F | 1.5" |
| March | 24°F | 47°F | 35°F | 2.6" |
| April | 35°F | 61°F | 48°F | 4.4" |
| May | 46°F | 73°F | 59°F | 4.0" |
| June | 57°F | 81°F | 69°F | 5.9" |
| July | 60°F | 85°F | 73°F | 4.9" |
| August | 59°F | 83°F | 71°F | 4.8" |
| September | 51°F | 77°F | 63°F | 3.5" |
| October | 40°F | 63°F | 51°F | 3.2" |
| November | 28°F | 49°F | 38°F | 2.1" |
| December | 17°F | 34°F | 25°F | 2.3" |
| Index | Deerfield | Wisconsin | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 12,871,100 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.160% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.010% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Fort Atkinson, WI | 12,455 | 37 | 26.0% |
| Lake Ripley, WI | 1,927 | 37 | 26.0% |
| Jefferson, WI | 8,011 | 37 | 26.0% |
| Marshall, WI | 3,975 | 37 | 26.0% |
| Cambridge, WI | 1,260 | 37 | 26.0% |
| Deerfield, WI | 2,553 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| West Bishop, CA | 2,553 | 47 | 6.0% |
| Pennington, NJ | 2,553 | 41 | 18.0% |
| Odell, OR | 2,553 | 23 | 54.0% |
| East Williston, NY | 2,552 | 51 | 2.0% |
| Williamsburg, OH | 2,552 | 54 | 8.0% |
| Deerfield, WI | 2,553 | 39 | 22.0% |