| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 58°F | 44°F | 2.9" |
| February | 38°F | 61°F | 48°F | 1.9" |
| March | 47°F | 70°F | 57°F | 3.9" |
| April | 54°F | 77°F | 65°F | 4.2" |
| May | 62°F | 83°F | 72°F | 4.7" |
| June | 71°F | 92°F | 81°F | 3.4" |
| July | 73°F | 96°F | 84°F | 2.7" |
| August | 74°F | 96°F | 84°F | 2.1" |
| September | 66°F | 90°F | 77°F | 2.9" |
| October | 54°F | 80°F | 66°F | 4.6" |
| November | 45°F | 68°F | 56°F | 3.5" |
| December | 36°F | 58°F | 46°F | 3.1" |
| Index | Melissa | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 723,856 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 181 |
| Days with moderate air quality | 155 |
| Days w/ poor A.Q. for sensitive groups | 28 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Allen, TX | 104,040 | 51 | 2.0% |
| Lucas, TX | 8,137 | 51 | 2.0% |
| Prosper, TX | 25,887 | 51 | 2.0% |
| Fairview, TX | 8,998 | 51 | 2.0% |
| McKinney, TX | 191,197 | 51 | 2.0% |
| Melissa, TX | 10,774 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Tay, ON | 10,774 | n/a | |
| Waihee-Waiehu, HI | 10,771 | 15 | 70.0% |
| Newport, OR | 10,767 | 17 | 66.0% |
| Taylorville, IL | 10,766 | 40 | 20.0% |
| Bellmead, TX | 10,763 | 38 | 24.0% |
| Melissa, TX | 10,774 | 51 | 2.0% |
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