| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 40°F | 27°F | 0.3" |
| February | 19°F | 43°F | 29°F | 0.4" |
| March | 29°F | 58°F | 41°F | 0.8" |
| April | 38°F | 65°F | 50°F | 3.6" |
| May | 48°F | 74°F | 60°F | 3.5" |
| June | 59°F | 84°F | 71°F | 3.8" |
| July | 64°F | 89°F | 76°F | 2.7" |
| August | 61°F | 86°F | 73°F | 3.5" |
| September | 52°F | 80°F | 64°F | 1.7" |
| October | 39°F | 67°F | 51°F | 1.8" |
| November | 27°F | 54°F | 39°F | 0.8" |
| December | 16°F | 39°F | 26°F | 0.4" |
| Index | Sumner | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 5,232,950 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 60 |
| Days with good air quality | 55 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Amherst, NE | 172 | 19 | 62.0% |
| Eddyville, NE | 105 | 19 | 62.0% |
| Lexington, NE | 10,069 | 19 | 62.0% |
| Oconto, NE | 174 | 19 | 62.0% |
| Overton, NE | 702 | 19 | 62.0% |
| Sumner, NE | 306 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Maytown, AL | 306 | 53 | 6.0% |
| Waldo, AL | 306 | 38 | 24.0% |
| Buckner, AR | 306 | 39 | 22.0% |
| Romeo, CO | 306 | 15 | 70.0% |
| Bostwick, GA | 306 | 44 | 12.0% |
| Sumner, NE | 306 | 19 | 62.0% |
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