| 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 | Youngsville | North Carolina | National |
| Air quality index | 46 | 35 | 42 |
| Pollution index | 4,980,580 | 2,789,538 | 2,726,193 |
| 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 | 0.004% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.001% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Butner, NC | 7,779 | 44 | 12.0% |
| Creedmoor, NC | 4,539 | 44 | 12.0% |
| Stem, NC | 1,169 | 44 | 12.0% |
| Rolesville, NC | 8,002 | 46 | 8.0% |
| Wake Forest, NC | 44,068 | 46 | 8.0% |
| Youngsville, NC | 2,225 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Silver Lake, FL | 2,225 | 38 | 24.0% |
| Myersville, MD | 2,225 | 40 | 20.0% |
| Four Oaks, NC | 2,225 | 40 | 20.0% |
| Park Falls, WI | 2,225 | 34 | 32.0% |
| Easton, CA | 2,224 | 60 | 20.0% |
| Youngsville, NC | 2,225 | 46 | 8.0% |
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