| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 0.8" |
| February | 25°F | 43°F | 33°F | 0.6" |
| March | 33°F | 52°F | 41°F | 3.0" |
| April | 42°F | 63°F | 52°F | 3.6" |
| May | 50°F | 72°F | 61°F | 4.5" |
| June | 62°F | 84°F | 73°F | 5.6" |
| July | 65°F | 83°F | 74°F | 8.8" |
| August | 62°F | 81°F | 71°F | 5.3" |
| September | 57°F | 80°F | 68°F | 3.4" |
| October | 48°F | 68°F | 57°F | 4.2" |
| November | 33°F | 52°F | 42°F | 0.9" |
| December | 18°F | 33°F | 25°F | 0.9" |
| Index | Clarence | Iowa | National |
| Air quality index | 35 | 39 | 42 |
| Pollution index | 551,554 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 278 |
| Days with moderate air quality | 86 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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. |
| Bennett, IA | 417 | 32 | 36.0% |
| Rochester, IA | 97 | 32 | 36.0% |
| Stanwood, IA | 673 | 35 | 30.0% |
| Tipton, IA | 3,192 | 35 | 30.0% |
| Olin, IA | 966 | 39 | 22.0% |
| Clarence, IA | 1,151 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Johnstonville, CA | 1,151 | 46 | 8.0% |
| Chevy Chase View, MD | 1,151 | 47 | 6.0% |
| Crenshaw, MS | 1,151 | 45 | 10.0% |
| Botkins, OH | 1,151 | 39 | 22.0% |
| Marshallton, PA | 1,151 | 42 | 16.0% |
| Clarence, IA | 1,151 | 35 | 30.0% |
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