| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 59°F | 46°F | 1.4" |
| February | 41°F | 63°F | 50°F | 1.4" |
| March | 49°F | 71°F | 59°F | 2.2" |
| April | 56°F | 77°F | 66°F | 3.4" |
| May | 64°F | 84°F | 73°F | 3.1" |
| June | 72°F | 93°F | 82°F | 1.7" |
| July | 75°F | 96°F | 84°F | 1.0" |
| August | 75°F | 97°F | 85°F | 1.3" |
| September | 69°F | 90°F | 78°F | 1.0" |
| October | 57°F | 80°F | 67°F | 2.4" |
| November | 48°F | 69°F | 57°F | 2.2" |
| December | 39°F | 59°F | 47°F | 2.9" |
| Index | Meridian | Texas | National |
| Air quality index | 33 | 52 | 42 |
| Pollution index | 4,190,870 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.060% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Iredell, TX | 392 | 33 | 34.0% |
| Morgan, TX | 495 | 33 | 34.0% |
| Walnut Springs, TX | 722 | 33 | 34.0% |
| Blum, TX | 456 | 33 | 34.0% |
| Clifton, TX | 3,427 | 38 | 24.0% |
| Meridian, TX | 1,720 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Moville, IA | 1,720 | 35 | 30.0% |
| Ledbetter, KY | 1,720 | 44 | 12.0% |
| Versailles, IN | 1,719 | 35 | 30.0% |
| Braham, MN | 1,721 | 32 | 36.0% |
| Lester Prairie, MN | 1,719 | 46 | 8.0% |
| Meridian, TX | 1,720 | 33 | 34.0% |
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