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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 29°F | 19°F | 1.4" |
| February | 12°F | 32°F | 22°F | 1.9" |
| March | 25°F | 47°F | 36°F | 2.3" |
| April | 36°F | 62°F | 49°F | 4.9" |
| May | 47°F | 72°F | 59°F | 4.5" |
| June | 58°F | 81°F | 69°F | 5.3" |
| July | 61°F | 84°F | 72°F | 6.9" |
| August | 59°F | 81°F | 70°F | 4.2" |
| September | 51°F | 76°F | 63°F | 3.2" |
| October | 40°F | 63°F | 51°F | 3.4" |
| November | 28°F | 49°F | 38°F | 2.2" |
| December | 15°F | 33°F | 24°F | 2.5" |
| Index | Hopkinton | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 586,175 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 287 |
| Days with moderate air quality | 78 |
| 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 | 0.090% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dyersville, IA | 4,131 | 29 | 42.0% |
| Worthington, IA | 360 | 29 | 42.0% |
| Cascade, IA | 2,104 | 29 | 42.0% |
| Farley, IA | 1,733 | 29 | 42.0% |
| New Vienna, IA | 401 | 29 | 42.0% |
| Hopkinton, IA | 568 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Dustin Acres, CA | 568 | 67 | 34.0% |
| Scranton, IA | 568 | 37 | 26.0% |
| Firth, ID | 568 | 27 | 46.0% |
| Hutsonville, IL | 568 | 45 | 10.0% |
| Grayson, LA | 568 | 34 | 32.0% |
| Hopkinton, IA | 568 | 39 | 22.0% |
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