| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 28°F | 21°F | 1.7" |
| February | 16°F | 30°F | 23°F | 2.3" |
| March | 29°F | 46°F | 36°F | 2.7" |
| April | 39°F | 59°F | 48°F | 4.4" |
| May | 50°F | 71°F | 60°F | 4.6" |
| June | 60°F | 79°F | 69°F | 9.5" |
| July | 64°F | 82°F | 72°F | 7.7" |
| August | 62°F | 80°F | 71°F | 6.1" |
| September | 54°F | 74°F | 63°F | 4.2" |
| October | 43°F | 61°F | 51°F | 4.4" |
| November | 32°F | 47°F | 38°F | 3.3" |
| December | 20°F | 32°F | 26°F | 1.1" |
| Index | New Glarus | Wisconsin | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,750,900 | 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 | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Argyle, WI | 890 | 29 | 42.0% |
| Woodford, WI | 45 | 29 | 42.0% |
| Monroe, WI | 10,573 | 38 | 24.0% |
| Albany, WI | 1,084 | 38 | 24.0% |
| Brodhead, WI | 3,211 | 38 | 24.0% |
| New Glarus, WI | 2,074 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Hampton, IL | 2,074 | 46 | 8.0% |
| Wakarusa, IN | 2,074 | 37 | 26.0% |
| Moravian Falls, NC | 2,074 | 43 | 14.0% |
| Arcade, NY | 2,074 | 39 | 22.0% |
| Gaston, SC | 2,074 | 43 | 14.0% |
| New Glarus, WI | 2,074 | 39 | 22.0% |
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