| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 37°F | 28°F | 2.0" |
| February | 21°F | 38°F | 29°F | 1.6" |
| March | 29°F | 49°F | 39°F | 2.9" |
| April | 40°F | 63°F | 51°F | 3.1" |
| May | 49°F | 72°F | 60°F | 4.2" |
| June | 58°F | 79°F | 68°F | 4.2" |
| July | 61°F | 83°F | 72°F | 4.1" |
| August | 59°F | 81°F | 69°F | 3.6" |
| September | 53°F | 75°F | 63°F | 3.3" |
| October | 44°F | 64°F | 53°F | 3.6" |
| November | 33°F | 52°F | 42°F | 2.2" |
| December | 26°F | 41°F | 33°F | 3.1" |
| Index | Hollidaysburg | Pennsylvania | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 604,690 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 281 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Portage, PA | 2,466 | 39 | 22.0% |
| Spring Hill, PA | 811 | 39 | 22.0% |
| Birmingham, PA | 120 | 41 | 18.0% |
| Ashville, PA | 163 | 41 | 18.0% |
| Duncansville, PA | 1,189 | 41 | 18.0% |
| Hollidaysburg, PA | 5,675 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Eastwood, MI | 5,675 | 38 | 24.0% |
| Ballston Spa, NY | 5,675 | 37 | 26.0% |
| Montrose-Ghent, OH | 5,677 | 43 | 14.0% |
| Spring Grove, IL | 5,672 | 39 | 22.0% |
| Mount Carmel, PA | 5,672 | 42 | 16.0% |
| Hollidaysburg, PA | 5,675 | 41 | 18.0% |
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