| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 37°F | 28°F | 2.8" |
| February | 19°F | 39°F | 29°F | 2.5" |
| March | 27°F | 49°F | 37°F | 3.0" |
| April | 38°F | 64°F | 50°F | 3.3" |
| May | 48°F | 74°F | 60°F | 3.2" |
| June | 57°F | 81°F | 69°F | 4.2" |
| July | 61°F | 86°F | 73°F | 3.7" |
| August | 59°F | 83°F | 71°F | 4.0" |
| September | 53°F | 77°F | 64°F | 3.5" |
| October | 43°F | 65°F | 53°F | 4.9" |
| November | 33°F | 53°F | 43°F | 2.6" |
| December | 25°F | 42°F | 33°F | 3.3" |
| Index | Harleigh | Pennsylvania | National |
| Air quality index | 38 | 45 | 42 |
| Pollution index | 1,279,530 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Conyngham, PA | 1,899 | 38 | 24.0% |
| Pardeesville, PA | 529 | 38 | 24.0% |
| Berwick, PA | 10,274 | 38 | 24.0% |
| Nuangola, PA | 705 | 38 | 24.0% |
| Wanamie, PA | 621 | 38 | 24.0% |
| Harleigh, PA | 1,199 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Wooster, AR | 1,199 | 45 | 10.0% |
| Blue Ridge, GA | 1,199 | 43 | 14.0% |
| Assumption, IL | 1,199 | 44 | 12.0% |
| Astoria, IL | 1,199 | 40 | 20.0% |
| Bromley, KY | 1,199 | 54 | 8.0% |
| Harleigh, PA | 1,199 | 38 | 24.0% |
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