| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 55°F | 42°F | 2.7" |
| February | 31°F | 58°F | 44°F | 2.6" |
| March | 39°F | 67°F | 52°F | 4.3" |
| April | 48°F | 76°F | 62°F | 4.1" |
| May | 56°F | 82°F | 68°F | 4.1" |
| June | 65°F | 90°F | 77°F | 4.8" |
| July | 69°F | 93°F | 80°F | 5.2" |
| August | 69°F | 91°F | 79°F | 4.9" |
| September | 62°F | 85°F | 72°F | 5.5" |
| October | 49°F | 75°F | 61°F | 3.4" |
| November | 38°F | 66°F | 51°F | 3.8" |
| December | 34°F | 58°F | 45°F | 4.1" |
| Index | Morrisville | North Carolina | National |
| Air quality index | 44 | 35 | 42 |
| Pollution index | 2,015,140 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 90 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.000% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Moncure, NC | 798 | 29 | 42.0% |
| Gorman, NC | 979 | 44 | 12.0% |
| Carrboro, NC | 21,254 | 44 | 12.0% |
| Chapel Hill, NC | 61,912 | 44 | 12.0% |
| Durham, NC | 276,341 | 44 | 12.0% |
| Morrisville, NC | 27,582 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Converse, TX | 27,582 | 49 | 2.0% |
| Milton, MA | 27,590 | 43 | 14.0% |
| South Laurel, MD | 27,593 | 47 | 6.0% |
| Monroeville, PA | 27,564 | 56 | 12.0% |
| Tualatin, OR | 27,601 | 38 | 24.0% |
| Morrisville, NC | 27,582 | 44 | 12.0% |
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