| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 57°F | 45°F | 2.3" |
| February | 39°F | 61°F | 48°F | 1.6" |
| March | 47°F | 69°F | 57°F | 1.7" |
| April | 55°F | 77°F | 65°F | 3.7" |
| May | 62°F | 83°F | 72°F | 3.2" |
| June | 71°F | 91°F | 80°F | 2.8" |
| July | 74°F | 95°F | 83°F | 1.2" |
| August | 74°F | 96°F | 84°F | 2.0" |
| September | 66°F | 89°F | 76°F | 1.0" |
| October | 55°F | 79°F | 65°F | 2.9" |
| November | 46°F | 68°F | 56°F | 2.1" |
| December | 38°F | 58°F | 47°F | 2.4" |
| Index | Celeste | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 723,856 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Blue Ridge, TX | 828 | 51 | 2.0% |
| Neylandville, TX | 170 | 51 | 2.0% |
| Campbell, TX | 932 | 51 | 2.0% |
| Farmersville, TX | 3,560 | 51 | 2.0% |
| Greenville, TX | 28,088 | 51 | 2.0% |
| Celeste, TX | 1,124 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Homeland, GA | 1,124 | 36 | 28.0% |
| Empire, LA | 1,124 | 45 | 10.0% |
| Germanton, NC | 1,124 | 45 | 10.0% |
| Salineville, OH | 1,124 | 6 | 88.0% |
| Paradise, PA | 1,124 | 45 | 10.0% |
| Celeste, TX | 1,124 | 51 | 2.0% |
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