| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 30°F | 24°F | 2.1" |
| February | 17°F | 30°F | 23°F | 2.4" |
| March | 26°F | 42°F | 33°F | 2.5" |
| April | 37°F | 56°F | 46°F | 3.3" |
| May | 48°F | 67°F | 57°F | 7.0" |
| June | 56°F | 73°F | 64°F | 7.2" |
| July | 60°F | 77°F | 68°F | 6.9" |
| August | 58°F | 75°F | 66°F | 5.3" |
| September | 52°F | 70°F | 60°F | 5.7" |
| October | 43°F | 58°F | 49°F | 4.7" |
| November | 33°F | 46°F | 39°F | 2.9" |
| December | 25°F | 36°F | 30°F | 2.8" |
| Index | Youngsville | Pennsylvania | National |
| Air quality index | 9 | 45 | 42 |
| Pollution index | 601,986 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 357 |
| Days with moderate air quality | 6 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Clarendon, PA | 321 | 9 | 82.0% |
| North Warren, PA | 2,008 | 9 | 82.0% |
| Starbrick, PA | 333 | 9 | 82.0% |
| Russell, PA | 1,447 | 9 | 82.0% |
| Warren, PA | 9,127 | 9 | 82.0% |
| Youngsville, PA | 1,711 | 9 | 82.0% |
| City | Population | Air Quality Index | National Avg. |
| Randolph, ME | 1,711 | 28 | 44.0% |
| Smith Valley, NV | 1,711 | 13 | 74.0% |
| Burns, TN | 1,711 | 45 | 10.0% |
| Sainte-Clotilde, QC | 1,711 | n/a | |
| Southport, CT | 1,710 | 43 | 14.0% |
| Youngsville, PA | 1,711 | 9 | 82.0% |
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