| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 25°F | 17°F | 1.3" |
| February | 11°F | 26°F | 18°F | 0.6" |
| March | 22°F | 41°F | 31°F | 1.4" |
| April | 35°F | 58°F | 46°F | 3.7" |
| May | 46°F | 68°F | 56°F | 5.4" |
| June | 57°F | 80°F | 68°F | 5.1" |
| July | 59°F | 82°F | 70°F | 4.8" |
| August | 59°F | 78°F | 68°F | 9.5" |
| September | 53°F | 74°F | 62°F | 6.6" |
| October | 42°F | 61°F | 51°F | 4.4" |
| November | 26°F | 41°F | 33°F | 2.0" |
| December | 11°F | 25°F | 18°F | 0.8" |
| Index | Granton | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 4,420,090 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 205 |
| Days with good air quality | 196 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Marshfield, WI | 18,214 | 34 | 32.0% |
| Chili, WI | 279 | 34 | 32.0% |
| Greenwood, WI | 955 | 34 | 32.0% |
| Loyal, WI | 1,250 | 34 | 32.0% |
| Hatfield, WI | 207 | 34 | 32.0% |
| Granton, WI | 351 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Vinegar Bend, AL | 351 | 42 | 16.0% |
| Perry, AR | 351 | 45 | 10.0% |
| Sacate Village, AZ | 351 | 74 | 48.0% |
| Lockwood, CA | 351 | 46 | 8.0% |
| Grand View, ID | 351 | 36 | 28.0% |
| Granton, WI | 351 | 34 | 32.0% |
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