| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 29°F | 20°F | 0.4" |
| February | 14°F | 30°F | 21°F | 1.8" |
| March | 29°F | 46°F | 36°F | 1.2" |
| April | 39°F | 62°F | 49°F | 3.6" |
| May | 50°F | 73°F | 61°F | 3.9" |
| June | 61°F | 83°F | 71°F | 2.1" |
| July | 63°F | 85°F | 74°F | 4.0" |
| August | 61°F | 82°F | 71°F | 1.6" |
| September | 53°F | 76°F | 64°F | 2.2" |
| October | 42°F | 63°F | 51°F | 3.0" |
| November | 29°F | 48°F | 38°F | 2.8" |
| December | 17°F | 32°F | 24°F | 0.7" |
| Index | Clarion | Iowa | National |
| Air quality index | 15 | 39 | 42 |
| Pollution index | 1,476,650 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 118 |
| Days with good air quality | 118 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Meservey, IA | 277 | 15 | 70.0% |
| Rowan, IA | 156 | 15 | 70.0% |
| Belmond, IA | 2,419 | 15 | 70.0% |
| Goldfield, IA | 631 | 15 | 70.0% |
| Alexander, IA | 160 | 15 | 70.0% |
| Clarion, IA | 2,726 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Cokato, MN | 2,726 | 32 | 36.0% |
| Dayton, OR | 2,726 | 32 | 36.0% |
| Gervais, OR | 2,726 | 32 | 36.0% |
| Beach City, TX | 2,726 | 52 | 4.0% |
| Parksdale, CA | 2,725 | 50 | = 100 |
| Clarion, IA | 2,726 | 15 | 70.0% |
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