| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 60°F | 48°F | 3.4" |
| February | 42°F | 62°F | 51°F | 2.1" |
| March | 50°F | 72°F | 60°F | 6.1" |
| April | 57°F | 78°F | 67°F | 2.8" |
| May | 67°F | 85°F | 75°F | 4.2" |
| June | 75°F | 94°F | 84°F | 4.1" |
| July | 77°F | 96°F | 86°F | 2.4" |
| August | 78°F | 97°F | 86°F | 2.6" |
| September | 70°F | 89°F | 79°F | 5.0" |
| October | 58°F | 79°F | 68°F | 5.0" |
| November | 50°F | 71°F | 59°F | 2.7" |
| December | 39°F | 60°F | 48°F | 2.3" |
| Index | Dallas | 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% |
| Carrollton, TX | 137,319 | 51 | 2.0% |
| Sachse, TX | 25,888 | 51 | 2.0% |
| Mesquite, TX | 142,429 | 51 | 2.0% |
| Duncanville, TX | 39,096 | 51 | 2.0% |
| Dallas, TX | 1,338,846 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Calgary, AB | 1,371,990 | n/a | |
| San Diego, CA | 1,414,545 | 64 | 28.0% |
| San Antonio, TX | 1,529,133 | 49 | 2.0% |
| Philadelphia, PA | 1,581,531 | 51 | 2.0% |
| Ottawa, ON | 1,058,126 | n/a | |
| Dallas, TX | 1,338,846 | 51 | 2.0% |
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