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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 39°F | 31°F | 2.9" |
| February | 26°F | 42°F | 33°F | 2.8" |
| March | 34°F | 53°F | 43°F | 4.1" |
| April | 44°F | 65°F | 54°F | 4.9" |
| May | 53°F | 73°F | 63°F | 4.8" |
| June | 62°F | 82°F | 71°F | 5.4" |
| July | 66°F | 86°F | 76°F | 4.0" |
| August | 64°F | 84°F | 73°F | 4.2" |
| September | 58°F | 77°F | 67°F | 5.2" |
| October | 48°F | 67°F | 57°F | 5.8" |
| November | 38°F | 55°F | 46°F | 3.1" |
| December | 31°F | 45°F | 38°F | 4.6" |
| Index | McKnightstown | Pennsylvania | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 5,553,870 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 288 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.410% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Fayetteville, PA | 2,855 | 36 | 28.0% |
| Guilford, PA | 3,571 | 36 | 28.0% |
| Orrstown, PA | 342 | 36 | 28.0% |
| Mont Alto, PA | 1,756 | 36 | 28.0% |
| Scotland, PA | 734 | 36 | 28.0% |
| McKnightstown, PA | 501 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Cullom, IL | 501 | 0 | 100.0% |
| Ribera, NM | 501 | 44 | 12.0% |
| McCurtain, OK | 501 | 36 | 28.0% |
| Renningers, PA | 501 | 42 | 16.0% |
| Summerhill, PA | 501 | 39 | 22.0% |
| McKnightstown, PA | 501 | 42 | 16.0% |
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