| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 39°F | 27°F | 0.9" |
| February | 22°F | 50°F | 34°F | 1.1" |
| March | 27°F | 58°F | 41°F | 3.3" |
| April | 32°F | 63°F | 47°F | 5.0" |
| May | 39°F | 68°F | 53°F | 5.1" |
| June | 52°F | 84°F | 68°F | 5.4" |
| July | 57°F | 90°F | 73°F | 3.0" |
| August | 55°F | 88°F | 71°F | 3.3" |
| September | 49°F | 81°F | 64°F | 3.5" |
| October | 38°F | 69°F | 52°F | 3.6" |
| November | 26°F | 55°F | 39°F | 1.5" |
| December | 16°F | 41°F | 28°F | 1.0" |
| Index | Harrisburg | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 656,658 | 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 | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Harrisburg, NE | 75 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| False Pass, AK | 75 | 31 | 38.0% |
| Lowndesboro, AL | 75 | 52 | 4.0% |
| Omaha, AR | 75 | 18 | 64.0% |
| Franklin, AZ | 75 | 37 | 26.0% |
| Gold Mountain, CA | 75 | 44 | 12.0% |
| Harrisburg, NE | 75 | 19 | 62.0% |
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