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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 2°F | 19°F | 10°F | 2.0" |
| February | 8°F | 25°F | 15°F | 0.7" |
| March | 22°F | 39°F | 29°F | 3.3" |
| April | 36°F | 54°F | 44°F | 3.8" |
| May | 48°F | 69°F | 57°F | 3.9" |
| June | 57°F | 76°F | 65°F | 4.2" |
| July | 62°F | 81°F | 71°F | 3.9" |
| August | 59°F | 80°F | 69°F | 4.7" |
| September | 51°F | 72°F | 60°F | 5.5" |
| October | 38°F | 56°F | 46°F | 4.9" |
| November | 27°F | 42°F | 34°F | 3.7" |
| December | 6°F | 22°F | 14°F | 1.0" |
| Index | Herman | Minnesota | National |
| Air quality index | 25 | 35 | 42 |
| Pollution index | 454,047 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 325 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Donnelly, MN | 250 | 25 | 50.0% |
| Dumont, MN | 111 | 25 | 50.0% |
| Barrett, MN | 364 | 33 | 34.0% |
| Norcross, MN | 63 | 33 | 34.0% |
| Elbow Lake CDP, MN | 69 | 33 | 34.0% |
| Herman, MN | 521 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| McArthur, CA | 521 | 42 | 16.0% |
| Hampton, FL | 521 | 35 | 30.0% |
| Seymour, IA | 521 | 39 | 22.0% |
| Golf, IL | 521 | 55 | 10.0% |
| Sun, LA | 521 | 30 | 40.0% |
| Herman, MN | 521 | 25 | 50.0% |
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