| 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 | DeSoto | 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. |
| Irving, TX | 240,475 | 51 | 2.0% |
| Pecan Hill, TX | 570 | 51 | 2.0% |
| Balch Springs, TX | 25,123 | 51 | 2.0% |
| Ferris, TX | 2,842 | 51 | 2.0% |
| Lancaster, TX | 39,264 | 51 | 2.0% |
| DeSoto, TX | 53,170 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Wheaton, IL | 53,157 | 55 | 10.0% |
| St. Cloud, FL | 53,132 | 39 | 22.0% |
| Palm Desert, CA | 53,087 | 89 | 78.0% |
| Hoboken, NJ | 53,283 | 51 | 2.0% |
| Brandon, MB | 53,334 | n/a | |
| DeSoto, TX | 53,170 | 51 | 2.0% |
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