| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 60°F | 47°F | 3.0" |
| February | 42°F | 65°F | 52°F | 2.1" |
| March | 50°F | 73°F | 61°F | 2.7" |
| April | 58°F | 80°F | 69°F | 3.8" |
| May | 65°F | 85°F | 74°F | 5.4" |
| June | 75°F | 94°F | 84°F | 4.7" |
| July | 78°F | 98°F | 87°F | 1.5" |
| August | 78°F | 99°F | 88°F | 3.0" |
| September | 72°F | 93°F | 81°F | 2.8" |
| October | 60°F | 82°F | 70°F | 3.5" |
| November | 49°F | 70°F | 58°F | 3.3" |
| December | 41°F | 61°F | 50°F | 3.0" |
| Index | Irving | 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. |
| Highland Park, TX | 9,143 | 51 | 2.0% |
| Trophy Club, TX | 11,904 | 51 | 2.0% |
| Richardson, TX | 118,583 | 51 | 2.0% |
| Pantego, TX | 2,479 | 51 | 2.0% |
| Hutchins, TX | 5,804 | 51 | 2.0% |
| Irving, TX | 240,475 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Regina, SK | 241,465 | n/a | |
| Garland, TX | 238,622 | 51 | 2.0% |
| Chesapeake, VA | 242,647 | 40 | 20.0% |
| Norfolk, VA | 244,300 | 40 | 20.0% |
| Arlington, VA | 236,434 | 47 | 6.0% |
| Irving, TX | 240,475 | 51 | 2.0% |
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