| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 29°F | 19°F | 0.5" |
| February | 15°F | 32°F | 22°F | 3.0" |
| March | 29°F | 50°F | 37°F | 2.2" |
| April | 39°F | 63°F | 50°F | 7.2" |
| May | 51°F | 74°F | 61°F | 8.1" |
| June | 62°F | 84°F | 72°F | 8.2" |
| July | 64°F | 87°F | 75°F | 9.1" |
| August | 63°F | 83°F | 72°F | 17.3" |
| September | 56°F | 81°F | 66°F | 7.3" |
| October | 44°F | 68°F | 53°F | 4.4" |
| November | 29°F | 51°F | 37°F | 4.8" |
| December | 12°F | 27°F | 19°F | 3.9" |
| Index | Pomeroy | Iowa | National |
| Air quality index | 37 | 39 | 42 |
| Pollution index | 517,691 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 214 |
| Days with good air quality | 210 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Varina, IA | 39 | 35 | 30.0% |
| Jolley, IA | 27 | 37 | 26.0% |
| Manson, IA | 1,760 | 37 | 26.0% |
| Rockwell City, IA | 2,166 | 37 | 26.0% |
| Knierim, IA | 57 | 37 | 26.0% |
| Pomeroy, IA | 502 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Madison, CA | 502 | 52 | 4.0% |
| Scales Mound, IL | 502 | 29 | 42.0% |
| Rothsay, MN | 502 | 33 | 34.0% |
| Glenaire, MO | 502 | 47 | 6.0% |
| Jane, MO | 502 | 44 | 12.0% |
| Pomeroy, IA | 502 | 37 | 26.0% |
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