| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 42°F | 27°F | 1.2" |
| February | 18°F | 44°F | 29°F | 0.7" |
| March | 26°F | 59°F | 41°F | 2.4" |
| April | 35°F | 65°F | 48°F | 5.9" |
| May | 44°F | 74°F | 58°F | 5.1" |
| June | 55°F | 86°F | 70°F | 5.6" |
| July | 61°F | 91°F | 75°F | 5.4" |
| August | 58°F | 88°F | 72°F | 4.0" |
| September | 48°F | 82°F | 64°F | 3.5" |
| October | 36°F | 68°F | 50°F | 2.9" |
| November | 24°F | 55°F | 38°F | 1.7" |
| December | 14°F | 41°F | 26°F | 1.0" |
| Index | Lewellen | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 154,541 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 113 |
| Days with good air quality | 110 |
| Days with moderate air quality | 3 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Belmar, NE | 80 | 19 | 62.0% |
| Oshkosh, NE | 936 | 19 | 62.0% |
| Lewellen, NE | 232 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Tetlin, AK | 232 | 38 | 24.0% |
| Gordonville, AL | 232 | 52 | 4.0% |
| Haivana Nakya, AZ | 232 | 47 | 6.0% |
| Blakesburg, IA | 232 | 39 | 22.0% |
| Fenton, IA | 232 | 15 | 70.0% |
| Lewellen, NE | 232 | 19 | 62.0% |
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