| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 39°F | 27°F | 0.4" |
| February | 21°F | 43°F | 30°F | 0.5" |
| March | 32°F | 58°F | 43°F | 1.2" |
| April | 42°F | 67°F | 53°F | 3.2" |
| May | 52°F | 77°F | 63°F | 4.3" |
| June | 63°F | 87°F | 74°F | 4.1" |
| July | 67°F | 90°F | 78°F | 2.6" |
| August | 64°F | 87°F | 74°F | 4.0" |
| September | 55°F | 81°F | 66°F | 2.0" |
| October | 43°F | 69°F | 54°F | 2.3" |
| November | 31°F | 55°F | 41°F | 0.9" |
| December | 20°F | 40°F | 29°F | 0.7" |
| Index | Milligan | Nebraska | National |
| Air quality index | 31 | 86 | 42 |
| Pollution index | 214,983 | 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 | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Geneva, NE | 1,955 | 19 | 62.0% |
| Fairmont, NE | 750 | 19 | 62.0% |
| Strang, NE | 25 | 19 | 62.0% |
| Daykin, NE | 173 | 31 | 38.0% |
| Tobias, NE | 122 | 31 | 38.0% |
| Milligan, NE | 303 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Twain, CA | 303 | 46 | 8.0% |
| Surrency, GA | 303 | 26 | 48.0% |
| Bagley, IA | 303 | 37 | 26.0% |
| Bush, IL | 303 | 43 | 14.0% |
| Opdyke, IL | 303 | 43 | 14.0% |
| Milligan, NE | 303 | 31 | 38.0% |
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