| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 33°F | 21°F | 1.0" |
| February | 18°F | 39°F | 27°F | 3.2" |
| March | 31°F | 58°F | 42°F | 3.9" |
| April | 40°F | 65°F | 51°F | 12.4" |
| May | 52°F | 77°F | 63°F | 5.1" |
| June | 62°F | 86°F | 73°F | 5.6" |
| July | 67°F | 90°F | 77°F | 7.0" |
| August | 64°F | 87°F | 74°F | 7.3" |
| September | 55°F | 83°F | 67°F | 19.1" |
| October | 43°F | 70°F | 54°F | 6.6" |
| November | 28°F | 56°F | 39°F | 5.4" |
| December | 13°F | 34°F | 22°F | 2.4" |
| Index | Howells | Nebraska | National |
| Air quality index | 40 | 86 | 42 |
| Pollution index | 153,847 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| 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 | 0.090% |
| Mercury | 0.160% |
| City | Population | Air Quality Index | National Avg. |
| Leigh, NE | 375 | 31 | 38.0% |
| Beemer, NE | 689 | 35 | 30.0% |
| Dodge, NE | 467 | 40 | 20.0% |
| Snyder, NE | 386 | 40 | 20.0% |
| Clarkson, NE | 671 | 40 | 20.0% |
| Howells, NE | 648 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Minden, IA | 648 | 40 | 20.0% |
| Rolfe, IA | 648 | 15 | 70.0% |
| Waldron, IN | 648 | 41 | 18.0% |
| Fort Jesup, LA | 648 | 30 | 40.0% |
| Edgerton, MO | 648 | 43 | 14.0% |
| Howells, NE | 648 | 40 | 20.0% |
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