| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 56°F | 44°F | 3.8" |
| February | 38°F | 59°F | 47°F | 2.7" |
| March | 46°F | 69°F | 56°F | 5.0" |
| April | 53°F | 76°F | 64°F | 6.1" |
| May | 62°F | 82°F | 71°F | 7.3" |
| June | 70°F | 91°F | 80°F | 3.5" |
| July | 72°F | 94°F | 82°F | 10.2" |
| August | 73°F | 96°F | 83°F | 5.3" |
| September | 65°F | 88°F | 75°F | 6.3" |
| October | 53°F | 77°F | 63°F | 3.7" |
| November | 45°F | 67°F | 55°F | 6.0" |
| December | 37°F | 57°F | 45°F | 8.5" |
| Index | Annona | Texas | National |
| Air quality index | 39 | 52 | 42 |
| Pollution index | 2,304,530 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 254 |
| Days with moderate air quality | 94 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.900% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 1.100% |
| City | Population | Air Quality Index | National Avg. |
| Clarksville, TX | 3,222 | 39 | 22.0% |
| Avery, TX | 854 | 39 | 22.0% |
| Annona, TX | 381 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Naknek, AK | 381 | 31 | 38.0% |
| Quimby, IA | 381 | 35 | 30.0% |
| Yale, IA | 381 | 39 | 22.0% |
| Herrick, IL | 381 | 40 | 20.0% |
| Royal, IL | 381 | 42 | 16.0% |
| Annona, TX | 381 | 39 | 22.0% |
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