| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 42°F | 33°F | 4.1" |
| February | 19°F | 39°F | 29°F | 3.3" |
| March | 27°F | 51°F | 38°F | 7.5" |
| April | 39°F | 62°F | 50°F | 7.2" |
| May | 46°F | 73°F | 60°F | 3.6" |
| June | 60°F | 84°F | 72°F | 4.8" |
| July | 62°F | 86°F | 74°F | 7.7" |
| August | 63°F | 86°F | 74°F | 8.7" |
| September | 54°F | 81°F | 67°F | 0.4" |
| October | 47°F | 71°F | 58°F | 10.0" |
| November | 33°F | 57°F | 45°F | 4.7" |
| December | 23°F | 41°F | 33°F | 4.8" |
| Index | York | Pennsylvania | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 12,532,500 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 299 |
| Days with moderate air quality | 66 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.180% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.130% |
| Mercury | 0.270% |
| City | Population | Air Quality Index | National Avg. |
| Hallam, PA | 2,642 | 41 | 18.0% |
| Stonybrook, PA | 3,150 | 41 | 18.0% |
| Bainbridge, PA | 1,399 | 41 | 18.0% |
| Manchester, PA | 2,680 | 41 | 18.0% |
| York Haven, PA | 819 | 41 | 18.0% |
| York, PA | 44,019 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Bountiful, UT | 43,991 | 51 | 2.0% |
| Rocky View County, AB | 44,056 | n/a | |
| Vernon, BC | 43,975 | n/a | |
| Wake Forest, NC | 44,068 | 46 | 8.0% |
| Altamonte Springs, FL | 43,969 | 39 | 22.0% |
| York, PA | 44,019 | 41 | 18.0% |
Here are the best places to live in Pennsylvania
These are the largest cities in Pennsylvania
See the best places to live in York
Check out the 10 safest cities in Pennsylvania