| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 39°F | 27°F | 0.6" |
| February | 20°F | 43°F | 30°F | 0.9" |
| March | 33°F | 58°F | 44°F | 2.0" |
| April | 43°F | 68°F | 54°F | 4.3" |
| May | 53°F | 77°F | 64°F | 4.6" |
| June | 64°F | 86°F | 75°F | 6.0" |
| July | 67°F | 89°F | 78°F | 4.0" |
| August | 64°F | 87°F | 75°F | 4.7" |
| September | 56°F | 81°F | 67°F | 3.5" |
| October | 44°F | 69°F | 55°F | 3.1" |
| November | 32°F | 56°F | 43°F | 1.5" |
| December | 21°F | 40°F | 30°F | 1.9" |
| Index | New Market | Iowa | National |
| Air quality index | 43 | 39 | 50 |
| Pollution index | 543,130 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Clarinda, IA | 5,431 | 40 | 20% |
| Yorktown, IA | 59 | 40 | 20% |
| Hepburn, IA | 30 | 40 | 20% |
| Nodaway, IA | 91 | 40 | 20% |
| Villisca, IA | 1,255 | 40 | 20% |
| New Market, IA | 393 | 43 | 14% |
| City, State | Population | Air Quality Index | National Avg. |
| Brasher Falls, NY | 393 | 0 | 100% |
| Faith, SD | 393 | 44 | 12% |
| Spring Grove, IN | 393 | 6 | 88% |
| Old Brownsboro Place, KY | 393 | 49 | 2% |
| Brookford, NC | 393 | 43 | 14% |
| New Market, IA | 393 | 43 | 14% |
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