| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 27°F | 18°F | 2.7" |
| February | 15°F | 38°F | 26°F | 3.2" |
| March | 26°F | 47°F | 36°F | 4.1" |
| April | 35°F | 61°F | 47°F | 5.3" |
| May | 41°F | 71°F | 56°F | 5.7" |
| June | 53°F | 81°F | 67°F | 9.3" |
| July | 55°F | 84°F | 70°F | 11.4" |
| August | 55°F | 82°F | 68°F | 13.1" |
| September | 51°F | 78°F | 64°F | 7.2" |
| October | 37°F | 63°F | 49°F | 6.7" |
| November | 27°F | 50°F | 38°F | 3.5" |
| December | 16°F | 33°F | 24°F | 3.6" |
| Index | Merrillan | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 1,453,040 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 305 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Taylor, WI | 383 | 15 | 70.0% |
| Hixton, WI | 424 | 34 | 32.0% |
| Neillsville, WI | 2,285 | 34 | 32.0% |
| Fairchild, WI | 559 | 34 | 32.0% |
| Alma Center, WI | 533 | 34 | 32.0% |
| Merrillan, WI | 644 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Kingston, GA | 644 | 44 | 12.0% |
| Halaula, HI | 644 | 16 | 68.0% |
| Albion, IA | 644 | 37 | 26.0% |
| Farmington, IA | 644 | 29 | 42.0% |
| Mount Auburn, IL | 644 | 44 | 12.0% |
| Merrillan, WI | 644 | 34 | 32.0% |
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