| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -5°F | 14°F | 5°F | 4.6" |
| February | -3°F | 16°F | 7°F | 1.8" |
| March | 13°F | 32°F | 23°F | 1.7" |
| April | 28°F | 51°F | 39°F | 1.5" |
| May | 41°F | 67°F | 54°F | 3.7" |
| June | 52°F | 75°F | 64°F | 3.9" |
| July | 55°F | 81°F | 69°F | 3.5" |
| August | 52°F | 79°F | 66°F | 1.8" |
| September | 45°F | 71°F | 58°F | 2.4" |
| October | 33°F | 55°F | 44°F | 1.6" |
| November | 19°F | 36°F | 27°F | 1.2" |
| December | 1°F | 18°F | 10°F | 3.3" |
| Index | Humboldt | Minnesota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 536,122 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 327 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| St. Vincent, MN | 37 | 33 | 34.0% |
| Pembina, ND | 461 | 33 | 34.0% |
| Lancaster, MN | 438 | 33 | 34.0% |
| Hallock, MN | 925 | 33 | 34.0% |
| Humboldt, MN | 50 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Morrison Bluff, AR | 50 | 36 | 28.0% |
| Johannesburg, CA | 50 | 67 | 34.0% |
| Robinson Mill, CA | 50 | 44 | 12.0% |
| Aredale, IA | 50 | 15 | 70.0% |
| Dunlap, KS | 50 | 22 | 56.0% |
| Humboldt, MN | 50 | 33 | 34.0% |
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