| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 2.8" |
| February | 20°F | 36°F | 27°F | 2.4" |
| March | 31°F | 52°F | 40°F | 4.8" |
| April | 40°F | 63°F | 50°F | 3.3" |
| May | 49°F | 74°F | 60°F | 4.6" |
| June | 57°F | 81°F | 68°F | 5.5" |
| July | 61°F | 85°F | 72°F | 6.5" |
| August | 59°F | 83°F | 70°F | 4.0" |
| September | 53°F | 76°F | 63°F | 3.8" |
| October | 43°F | 63°F | 52°F | 3.5" |
| November | 33°F | 53°F | 42°F | 3.6" |
| December | 25°F | 40°F | 31°F | 3.3" |
| Index | Darlington | Pennsylvania | National |
| Air quality index | 31 | 45 | 42 |
| Pollution index | 1,352,650 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 356 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Glasgow, PA | 115 | 6 | 88.0% |
| Beaver Falls, PA | 8,393 | 6 | 88.0% |
| Monaca, PA | 5,466 | 6 | 88.0% |
| Rochester, PA | 3,468 | 6 | 88.0% |
| Wellsville, OH | 3,336 | 6 | 88.0% |
| Darlington, PA | 201 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Lakeview, AL | 201 | 39 | 22.0% |
| Garner, AR | 201 | 45 | 10.0% |
| Danville, GA | 201 | 38 | 24.0% |
| Lilly, GA | 201 | 39 | 22.0% |
| Haena, HI | 201 | 13 | 74.0% |
| Darlington, PA | 201 | 31 | 38.0% |
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