| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 36°F | 23°F | 0.8" |
| February | 15°F | 40°F | 26°F | 0.7" |
| March | 26°F | 55°F | 39°F | 1.2" |
| April | 37°F | 65°F | 50°F | 3.2" |
| May | 48°F | 76°F | 61°F | 4.1" |
| June | 58°F | 85°F | 72°F | 5.1" |
| July | 62°F | 89°F | 76°F | 2.0" |
| August | 60°F | 86°F | 73°F | 4.6" |
| September | 51°F | 80°F | 65°F | 2.5" |
| October | 39°F | 67°F | 52°F | 2.7" |
| November | 26°F | 54°F | 39°F | 0.7" |
| December | 14°F | 37°F | 25°F | 1.3" |
| Index | Norfolk | Nebraska | National |
| Air quality index | 35 | 86 | 42 |
| Pollution index | 153,847 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 322 |
| Days with moderate air quality | 42 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.090% |
| Mercury | 0.160% |
| City | Population | Air Quality Index | National Avg. |
| Madison, NE | 2,239 | 35 | 30.0% |
| Woodland Park, NE | 1,418 | 35 | 30.0% |
| Battle Creek, NE | 1,503 | 35 | 30.0% |
| Pierce, NE | 1,973 | 35 | 30.0% |
| Hadar, NE | 289 | 35 | 30.0% |
| Norfolk, NE | 24,410 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Trotwood, OH | 24,410 | 47 | 6.0% |
| Wilsonville, OR | 24,413 | 38 | 24.0% |
| Selma, CA | 24,405 | 56 | 12.0% |
| Willowbrook, CA | 24,401 | 72 | 44.0% |
| Candler-McAfee, GA | 24,419 | 52 | 4.0% |
| Norfolk, NE | 24,410 | 35 | 30.0% |
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