| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 60°F | 47°F | 6.7" |
| February | 42°F | 66°F | 52°F | 4.8" |
| March | 48°F | 70°F | 58°F | 9.0" |
| April | 56°F | 78°F | 66°F | 9.0" |
| May | 62°F | 82°F | 71°F | 5.9" |
| June | 70°F | 89°F | 79°F | 5.6" |
| July | 73°F | 93°F | 82°F | 4.4" |
| August | 72°F | 95°F | 82°F | 15.0" |
| September | 68°F | 91°F | 79°F | 7.9" |
| October | 58°F | 82°F | 69°F | 15.5" |
| November | 48°F | 69°F | 57°F | 8.2" |
| December | 40°F | 61°F | 50°F | 5.3" |
| Index | Wortham | Texas | National |
| Air quality index | 41 | 52 | 42 |
| Pollution index | 1,309,490 | 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 | 0.430% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.390% |
| City | Population | Air Quality Index | National Avg. |
| Kirvin, TX | 167 | 41 | 18.0% |
| Eureka, TX | 265 | 41 | 18.0% |
| Mexia, TX | 7,319 | 41 | 18.0% |
| Tehuacana, TX | 188 | 41 | 18.0% |
| Navarro, TX | 168 | 41 | 18.0% |
| Wortham, TX | 1,299 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Hayfield, MN | 1,299 | 36 | 28.0% |
| Jamaica Beach, TX | 1,299 | 52 | 4.0% |
| Enigma, GA | 1,298 | 26 | 48.0% |
| Hamburg, IA | 1,300 | 40 | 20.0% |
| Albany, LA | 1,300 | 30 | 40.0% |
| Wortham, TX | 1,299 | 41 | 18.0% |
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