| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 60°F | 47°F | 2.9" |
| February | 41°F | 64°F | 51°F | 1.6" |
| March | 49°F | 72°F | 60°F | 3.8" |
| April | 57°F | 78°F | 67°F | 3.5" |
| May | 64°F | 84°F | 74°F | 4.4" |
| June | 73°F | 93°F | 82°F | 4.4" |
| July | 76°F | 96°F | 85°F | 1.8" |
| August | 76°F | 98°F | 86°F | 1.6" |
| September | 69°F | 91°F | 79°F | 3.8" |
| October | 58°F | 81°F | 68°F | 4.1" |
| November | 49°F | 70°F | 58°F | 2.7" |
| December | 40°F | 60°F | 49°F | 2.5" |
| Index | Duncanville | Texas | National |
| Air quality index | 51 | 52 | 50 |
| Pollution index | 3,706,540 | 4,642,916 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Euless, TX | 53,675 | 51 | 2% |
| University Park, TX | 24,346 | 51 | 2% |
| Venus, TX | 3,211 | 51 | 2% |
| Pantego, TX | 2,497 | 51 | 2% |
| Glenn Heights, TX | 11,958 | 51 | 2% |
| Duncanville, TX | 39,599 | 51 | 2% |
| City, State | Population | Air Quality Index | National Avg. |
| Hilton Head Island, SC | 39,651 | 39 | 22% |
| Marlborough, MA | 39,545 | 40 | 20% |
| Bullhead City, AZ | 39,653 | 13 | 74% |
| Shakopee, MN | 39,656 | 46 | 8% |
| Maplewood, MN | 39,678 | 46 | 8% |
| Duncanville, TX | 39,599 | 51 | 2% |
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