| 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 | Hillsborough | Raleigh | North Carolina |
| Air quality index | 46 | 46 | 35 |
| Pollution index | 227,321 | 227,321 | 2,789,538 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 239 |
| Days with moderate air quality | 126 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Durham, NC | 276,341 | 44 | 12.0% |
| Morrisville, NC | 27,582 | 44 | 12.0% |
| Clayton, NC | 23,179 | 46 | 8.0% |
| Cary, NC | 169,177 | 46 | 8.0% |
| Fuquay-Varina, NC | 29,110 | 46 | 8.0% |
| Raleigh, NC | 469,698 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Colorado Springs, CO | 471,686 | 45 | 10.0% |
| Long Beach, CA | 462,081 | 72 | 44.0% |
| Miami, FL | 461,080 | 41 | 18.0% |
| Omaha, NE | 479,529 | 40 | 20.0% |
| Halifax, NS | 451,852 | n/a | |
| Raleigh, NC | 469,698 | 46 | 8.0% |
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