| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 28°F | 21°F | 1.8" |
| February | 15°F | 30°F | 22°F | 1.1" |
| March | 26°F | 43°F | 34°F | 3.6" |
| April | 36°F | 56°F | 45°F | 7.5" |
| May | 47°F | 68°F | 56°F | 4.1" |
| June | 56°F | 77°F | 66°F | 4.1" |
| July | 60°F | 81°F | 70°F | 1.5" |
| August | 59°F | 78°F | 68°F | 4.1" |
| September | 51°F | 72°F | 61°F | 5.1" |
| October | 42°F | 59°F | 50°F | 5.8" |
| November | 31°F | 46°F | 38°F | 2.1" |
| December | 20°F | 32°F | 26°F | 4.5" |
| Index | Richfield | Wisconsin | National |
| Air quality index | 44 | 69 | 42 |
| Pollution index | 2,032,370 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 254 |
| Days with moderate air quality | 108 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Hartford, WI | 15,228 | 37 | 26.0% |
| Oconomowoc, WI | 16,931 | 37 | 26.0% |
| Delafield, WI | 7,541 | 37 | 26.0% |
| Oconomowoc Lake, WI | 621 | 37 | 26.0% |
| Nashotah, WI | 1,287 | 37 | 26.0% |
| Richfield, WI | 11,782 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Madison, IN | 11,783 | 35 | 30.0% |
| Stony Brook, NY | 11,785 | 43 | 14.0% |
| Red Bank, TN | 11,785 | 46 | 8.0% |
| North Wantagh, NY | 11,792 | 51 | 2.0% |
| North Dundas, ON | 11,794 | n/a | |
| Richfield, WI | 11,782 | 44 | 12.0% |
Here are the best places to live in Wisconsin
Most Dangerous States In The US
These are the 10 cheapest cities in Wisconsin
See the best places to live in Richfield