| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 58°F | 47°F | 7.1" |
| February | 42°F | 62°F | 51°F | 2.6" |
| March | 51°F | 70°F | 60°F | 7.1" |
| April | 58°F | 77°F | 67°F | 9.9" |
| May | 66°F | 84°F | 74°F | 11.4" |
| June | 75°F | 92°F | 83°F | 5.8" |
| July | 77°F | 95°F | 86°F | 2.0" |
| August | 78°F | 96°F | 87°F | 1.4" |
| September | 71°F | 89°F | 80°F | 0.5" |
| October | 60°F | 79°F | 69°F | 14.4" |
| November | 50°F | 68°F | 58°F | 8.2" |
| December | 40°F | 58°F | 48°F | 6.1" |
| Index | Richardson | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 3,706,540 | 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 | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Horseshoe Bend, TX | 621 | 51 | 2.0% |
| University Park, TX | 25,027 | 51 | 2.0% |
| Garland, TX | 238,622 | 51 | 2.0% |
| Rowlett, TX | 65,426 | 51 | 2.0% |
| Mesquite, TX | 142,429 | 51 | 2.0% |
| Richardson, TX | 118,583 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Sugar Land, TX | 118,563 | 52 | 4.0% |
| Evansville, IN | 118,414 | 45 | 10.0% |
| Waterloo, ON | 118,234 | n/a | |
| Terrebonne, QC | 119,135 | n/a | |
| Cambridge, MA | 117,822 | 43 | 14.0% |
| Richardson, TX | 118,583 | 51 | 2.0% |
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