| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 39°F | 25°F | 0.3" |
| February | 15°F | 43°F | 27°F | 0.4" |
| March | 25°F | 57°F | 39°F | 0.7" |
| April | 33°F | 63°F | 47°F | 2.3" |
| May | 41°F | 72°F | 56°F | 2.9" |
| June | 52°F | 85°F | 68°F | 2.7" |
| July | 59°F | 94°F | 76°F | 1.4" |
| August | 56°F | 92°F | 73°F | 1.3" |
| September | 46°F | 82°F | 63°F | 1.2" |
| October | 34°F | 66°F | 49°F | 1.5" |
| November | 22°F | 54°F | 36°F | 0.5" |
| December | 11°F | 38°F | 23°F | 0.5" |
| Index | Harrison | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 153,407 | 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 | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Van Tassell, WY | 18 | 19 | 62.0% |
| Harrison, NE | 288 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Gilmore, AR | 288 | 45 | 10.0% |
| Derby Acres, CA | 288 | 67 | 34.0% |
| Little Creek, DE | 288 | 42 | 16.0% |
| Cecil, GA | 288 | 35 | 30.0% |
| Palmer, IL | 288 | 40 | 20.0% |
| Harrison, NE | 288 | 19 | 62.0% |
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