| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 15°F | 0.7" |
| February | 8°F | 27°F | 17°F | 2.1" |
| March | 24°F | 41°F | 31°F | 2.1" |
| April | 36°F | 57°F | 45°F | 4.9" |
| May | 47°F | 70°F | 58°F | 8.5" |
| June | 58°F | 78°F | 67°F | 8.8" |
| July | 62°F | 83°F | 72°F | 7.0" |
| August | 59°F | 80°F | 69°F | 11.9" |
| September | 52°F | 74°F | 61°F | 5.3" |
| October | 39°F | 59°F | 48°F | 7.7" |
| November | 27°F | 45°F | 35°F | 2.9" |
| December | 12°F | 27°F | 20°F | 2.9" |
| Index | Darwin | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 1,148,020 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 344 |
| Days with good air quality | 313 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Dassel, MN | 1,443 | 32 | 36.0% |
| Silver Lake, MN | 906 | 32 | 36.0% |
| Cokato, MN | 2,726 | 32 | 36.0% |
| Kingston, MN | 222 | 32 | 36.0% |
| Cedar Mills, MN | 40 | 32 | 36.0% |
| Darwin, MN | 302 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Shorter, AL | 302 | 52 | 4.0% |
| Salesville, AR | 302 | 36 | 28.0% |
| Kino Springs, AZ | 302 | 31 | 38.0% |
| Slaughter Beach, DE | 302 | 42 | 16.0% |
| Spring Ridge, FL | 302 | 35 | 30.0% |
| Darwin, MN | 302 | 32 | 36.0% |
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