| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 63°F | 51°F | 3.6" |
| February | 45°F | 67°F | 55°F | 2.5" |
| March | 52°F | 74°F | 62°F | 3.4" |
| April | 59°F | 80°F | 69°F | 3.3" |
| May | 66°F | 86°F | 75°F | 5.7" |
| June | 73°F | 93°F | 82°F | 3.6" |
| July | 75°F | 94°F | 84°F | 2.9" |
| August | 75°F | 96°F | 84°F | 4.0" |
| September | 69°F | 90°F | 79°F | 2.9" |
| October | 59°F | 83°F | 70°F | 3.7" |
| November | 51°F | 72°F | 60°F | 3.6" |
| December | 44°F | 64°F | 53°F | 3.5" |
| Index | Leona | Texas | National |
| Air quality index | 41 | 52 | 42 |
| Pollution index | 2,639,400 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 3 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Normangee, TX | 772 | 38 | 24.0% |
| Hilltop Lakes, TX | 805 | 38 | 24.0% |
| Madisonville, TX | 4,740 | 41 | 18.0% |
| Jewett, TX | 785 | 41 | 18.0% |
| Midway, TX | 326 | 41 | 18.0% |
| Leona, TX | 287 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Bowles, CA | 287 | 60 | 20.0% |
| Iroquois, IL | 287 | 42 | 16.0% |
| Mentor, KY | 287 | 54 | 8.0% |
| Parsonsburg, MD | 287 | 36 | 28.0% |
| Pecktonville, MD | 287 | 40 | 20.0% |
| Leona, TX | 287 | 41 | 18.0% |
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