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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 39°F | 30°F | 2.5" |
| February | 21°F | 41°F | 31°F | 2.5" |
| March | 32°F | 55°F | 42°F | 4.0" |
| April | 41°F | 68°F | 54°F | 4.1" |
| May | 52°F | 76°F | 64°F | 3.9" |
| June | 60°F | 83°F | 71°F | 5.2" |
| July | 62°F | 85°F | 73°F | 4.8" |
| August | 60°F | 85°F | 72°F | 3.7" |
| September | 53°F | 79°F | 65°F | 3.4" |
| October | 42°F | 67°F | 54°F | 3.7" |
| November | 32°F | 55°F | 43°F | 2.9" |
| December | 27°F | 45°F | 35°F | 3.5" |
| Index | Circleville | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 2,306,000 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.710% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.020% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Laurelville, OH | 525 | 25 | 50.0% |
| Adelphi, OH | 371 | 25 | 50.0% |
| Frankfort, OH | 1,314 | 38 | 24.0% |
| Williamsport, OH | 962 | 38 | 24.0% |
| Kingston, OH | 941 | 38 | 24.0% |
| Circleville, OH | 13,986 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Oak Park, CA | 13,987 | 72 | 44.0% |
| Hidalgo, TX | 13,984 | 42 | 16.0% |
| Sainte-Marie, QC | 13,983 | n/a | |
| Bayou Blue, LA | 13,997 | 41 | 18.0% |
| Guelph/Eramosa, ON | 13,999 | n/a | |
| Circleville, OH | 13,986 | 46 | 8.0% |
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