| 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% |
| Durham, NC | 276,341 | 44 | 12.0% |
| Fearrington Village, NC | 2,692 | 44 | 12.0% |
| Gorman, NC | 979 | 44 | 12.0% |
| Carrboro, NC | 21,254 | 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% |
Here are the best places to live in North Carolina
Most Dangerous Cities In The US
See the best places to live in Morrisville
Check out the 10 safest cities in North Carolina