| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 39°F | 27°F | 0.6" |
| February | 20°F | 43°F | 30°F | 0.9" |
| March | 33°F | 58°F | 44°F | 2.0" |
| April | 43°F | 68°F | 54°F | 4.3" |
| May | 53°F | 77°F | 64°F | 4.6" |
| June | 64°F | 86°F | 75°F | 6.0" |
| July | 67°F | 89°F | 78°F | 4.0" |
| August | 64°F | 87°F | 75°F | 4.7" |
| September | 56°F | 81°F | 67°F | 3.5" |
| October | 44°F | 69°F | 55°F | 3.1" |
| November | 32°F | 56°F | 43°F | 1.5" |
| December | 21°F | 40°F | 30°F | 1.9" |
| Index | Humboldt | Nebraska | National |
| Air quality index | 31 | 86 | 42 |
| Pollution index | 231,899 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 338 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.340% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Table Rock, NE | 398 | 31 | 38.0% |
| Pawnee City, NE | 976 | 31 | 38.0% |
| Tecumseh, NE | 1,818 | 31 | 38.0% |
| Elk Creek, NE | 92 | 31 | 38.0% |
| Du Bois, NE | 106 | 31 | 38.0% |
| Humboldt, NE | 913 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Okoboji, IA | 913 | 32 | 36.0% |
| Little Rock, MN | 913 | 33 | 34.0% |
| Roosevelt, NJ | 913 | 41 | 18.0% |
| Unadilla, NY | 913 | 27 | 46.0% |
| Selma, OR | 913 | 26 | 48.0% |
| Humboldt, NE | 913 | 31 | 38.0% |
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