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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 27°F | 41°F | 34°F | 3.2" | 
| February | 28°F | 45°F | 36°F | 1.5" | 
| March | 36°F | 53°F | 44°F | 4.2" | 
| April | 46°F | 65°F | 55°F | 4.4" | 
| May | 56°F | 73°F | 64°F | 1.8" | 
| June | 65°F | 82°F | 73°F | 4.5" | 
| July | 70°F | 86°F | 77°F | 6.8" | 
| August | 67°F | 83°F | 74°F | 1.2" | 
| September | 62°F | 78°F | 69°F | 4.8" | 
| October | 51°F | 68°F | 58°F | 1.2" | 
| November | 39°F | 56°F | 47°F | 1.1" | 
| December | 32°F | 47°F | 39°F | 0.4" | 
| Index | Riverview | Delaware | National | 
| Air quality index | 42 | 41 | 42 | 
| Pollution index | 3,193,180 | 7,274,307 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 293 | 
| Days with moderate air quality | 72 | 
| Days w/ poor A.Q. for sensitive groups | 0 | 
| Days with unhealthy air quality | 0 | 
| Pollutant | Total | 
| Arsenic | 0.010% | 
| Benzene | 0.030% | 
| Carbon Tetrachloride | 0.000% | 
| Lead | 0.010% | 
| Mercury | 0.020% | 
| City | Population | Air Quality Index | National Avg. | 
| Farmington, DE | 184 | 36 | 28.0% | 
| Bowers, DE | 312 | 42 | 16.0% | 
| Harrington, DE | 3,658 | 42 | 16.0% | 
| Leipsic, DE | 141 | 42 | 16.0% | 
| Rising Sun-Lebanon, DE | 4,170 | 42 | 16.0% | 
| Riverview, DE | 2,557 | 42 | 16.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Keeseville, NY | 2,557 | 37 | 26.0% | 
| Gibsonburg, OH | 2,557 | 40 | 20.0% | 
| Myrtle Point, OR | 2,557 | 19 | 62.0% | 
| East Cleveland, TN | 2,557 | 1 | 98.0% | 
| Calmar, AB | 2,557 | n/a | |
| Riverview, DE | 2,557 | 42 | 16.0% |