| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 36°F | 26°F | 1.8" |
| February | 20°F | 40°F | 28°F | 2.7" |
| March | 32°F | 55°F | 42°F | 3.3" |
| April | 43°F | 66°F | 53°F | 7.0" |
| May | 53°F | 76°F | 64°F | 8.3" |
| June | 64°F | 85°F | 74°F | 9.6" |
| July | 68°F | 89°F | 78°F | 7.1" |
| August | 66°F | 86°F | 75°F | 9.6" |
| September | 57°F | 79°F | 67°F | 7.6" |
| October | 45°F | 67°F | 54°F | 7.4" |
| November | 32°F | 54°F | 41°F | 4.1" |
| December | 21°F | 39°F | 29°F | 5.5" |
| Index | Gretna | Nebraska | National |
| Air quality index | 40 | 86 | 42 |
| Pollution index | 2,170,910 | 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 | 0.030% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Murdock, NE | 177 | 31 | 38.0% |
| Ashland, NE | 2,834 | 31 | 38.0% |
| Greenwood, NE | 489 | 31 | 38.0% |
| Springfield, NE | 1,582 | 40 | 20.0% |
| South Bend, NE | 110 | 40 | 20.0% |
| Gretna, NE | 5,039 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Rainsville, AL | 5,038 | 39 | 22.0% |
| Hudson, TX | 5,038 | 36 | 28.0% |
| Coverdale, NB | 5,038 | n/a | |
| Mattawa, WA | 5,040 | 38 | 24.0% |
| Archer Lodge, NC | 5,037 | 46 | 8.0% |
| Gretna, NE | 5,039 | 40 | 20.0% |
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