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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 45°F | 7.1" |
| February | 39°F | 62°F | 49°F | 4.4" |
| March | 47°F | 70°F | 58°F | 5.0" |
| April | 55°F | 77°F | 65°F | 6.6" |
| May | 62°F | 84°F | 72°F | 6.7" |
| June | 71°F | 92°F | 81°F | 7.1" |
| July | 73°F | 96°F | 84°F | 5.0" |
| August | 73°F | 97°F | 84°F | 7.7" |
| September | 67°F | 90°F | 77°F | 5.4" |
| October | 55°F | 80°F | 67°F | 13.4" |
| November | 47°F | 69°F | 56°F | 6.3" |
| December | 38°F | 59°F | 47°F | 6.4" |
| Index | Lancaster | 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. |
| DeSoto, TX | 53,170 | 51 | 2.0% |
| Grand Prairie, TX | 193,835 | 51 | 2.0% |
| Wilmer, TX | 4,698 | 51 | 2.0% |
| Midlothian, TX | 31,533 | 51 | 2.0% |
| Waxahachie, TX | 36,735 | 51 | 2.0% |
| Lancaster, TX | 39,264 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Milton, GA | 39,252 | 52 | 4.0% |
| Roy, UT | 39,243 | 45 | 10.0% |
| Essex, MD | 39,307 | 46 | 8.0% |
| Port Moody, BC | 39,217 | n/a | |
| Annapolis, MD | 39,321 | 46 | 8.0% |
| Lancaster, TX | 39,264 | 51 | 2.0% |