| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 55°F | 43°F | 4.3" |
| February | 31°F | 54°F | 40°F | 4.9" |
| March | 39°F | 65°F | 50°F | 7.0" |
| April | 46°F | 72°F | 58°F | 5.6" |
| May | 54°F | 78°F | 65°F | 4.3" |
| June | 64°F | 87°F | 74°F | 4.2" |
| July | 68°F | 90°F | 78°F | 3.0" |
| August | 69°F | 93°F | 80°F | 2.9" |
| September | 63°F | 87°F | 73°F | 3.8" |
| October | 53°F | 76°F | 63°F | 5.4" |
| November | 40°F | 63°F | 50°F | 6.1" |
| December | 34°F | 55°F | 43°F | 6.9" |
| Index | Hillsborough | North Carolina | National |
| Air quality index | 44 | 35 | 42 |
| Pollution index | 4,980,580 | 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 | 0.004% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.001% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Haw River, NC | 2,477 | 31 | 38.0% |
| Mebane, NC | 15,564 | 31 | 38.0% |
| Swepsonville, NC | 2,254 | 31 | 38.0% |
| Saxapahaw, NC | 1,340 | 31 | 38.0% |
| Green Level, NC | 2,541 | 31 | 38.0% |
| Hillsborough, NC | 7,162 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Palmyra, NJ | 7,162 | 51 | 2.0% |
| Sappington, MO | 7,161 | 54 | 8.0% |
| North Bend, WA | 7,161 | 45 | 10.0% |
| Mims, FL | 7,164 | 37 | 26.0% |
| Plain City, UT | 7,159 | 45 | 10.0% |
| Hillsborough, NC | 7,162 | 44 | 12.0% |
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