| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 5.3" |
| February | 22°F | 41°F | 31°F | 4.5" |
| March | 31°F | 52°F | 41°F | 6.9" |
| April | 41°F | 65°F | 53°F | 6.5" |
| May | 51°F | 74°F | 62°F | 7.6" |
| June | 60°F | 82°F | 71°F | 8.8" |
| July | 64°F | 87°F | 75°F | 7.6" |
| August | 62°F | 83°F | 72°F | 8.9" |
| September | 55°F | 77°F | 66°F | 10.8" |
| October | 44°F | 66°F | 55°F | 8.6" |
| November | 34°F | 54°F | 44°F | 6.0" |
| December | 28°F | 43°F | 35°F | 6.6" |
| Index | Lykens | Pennsylvania | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 3,637,020 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 278 |
| Days with moderate air quality | 78 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Freeburg, PA | 793 | 35 | 30.0% |
| Muir, PA | 448 | 42 | 16.0% |
| Williamstown, PA | 1,172 | 42 | 16.0% |
| Fredericksburg CDP (Crawford County), PA | 777 | 42 | 16.0% |
| Orwin, PA | 196 | 42 | 16.0% |
| Lykens, PA | 1,932 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Milo, ME | 1,932 | 31 | 38.0% |
| Morenci, MI | 1,932 | 39 | 22.0% |
| Clayton, NY | 1,932 | 35 | 30.0% |
| Peach Lake, NY | 1,932 | 43 | 14.0% |
| Jonestown, PA | 1,932 | 42 | 16.0% |
| Lykens, PA | 1,932 | 42 | 16.0% |
Here are the best places to live in Pennsylvania
These are the 10 cheapest cities in Pennsylvania
See the best places to live in Lykens
Check out the 10 most dangerous cities in Pennsylvania