| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 27°F | 17°F | 0.3" |
| February | 10°F | 30°F | 19°F | 0.5" |
| March | 26°F | 46°F | 34°F | 1.2" |
| April | 36°F | 61°F | 47°F | 2.9" |
| May | 48°F | 73°F | 59°F | 4.0" |
| June | 58°F | 82°F | 70°F | 5.0" |
| July | 62°F | 86°F | 74°F | 3.2" |
| August | 59°F | 82°F | 70°F | 4.3" |
| September | 51°F | 77°F | 63°F | 2.9" |
| October | 39°F | 63°F | 49°F | 2.3" |
| November | 25°F | 48°F | 36°F | 0.9" |
| December | 12°F | 30°F | 21°F | 0.8" |
| Index | Sheldon | Iowa | National |
| Air quality index | 36 | 39 | 50 |
| Pollution index | 3,266,490 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 321 |
| Days with moderate air quality | 43 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.060% |
| City, State | Population | Air Quality Index | National Avg. |
| Paullina, IA | 1,034 | 35 | 30% |
| Hospers, IA | 756 | 35 | 30% |
| Primghar, IA | 973 | 35 | 30% |
| Alton, IA | 1,325 | 35 | 30% |
| Archer, IA | 177 | 35 | 30% |
| Sheldon, IA | 5,015 | 36 | 28% |
| City, State | Population | Air Quality Index | National Avg. |
| Port Isabel, TX | 5,015 | 44 | 12% |
| Mayville, WI | 5,016 | 40 | 20% |
| Mendham, NJ | 5,012 | 34 | 32% |
| Falmouth, VA | 5,018 | 47 | 6% |
| Whiskey Creek, FL | 5,011 | 36 | 28% |
| Sheldon, IA | 5,015 | 36 | 28% |
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