| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 61°F | 48°F | 2.8" |
| February | 42°F | 65°F | 52°F | 1.7" |
| March | 50°F | 72°F | 60°F | 5.1" |
| April | 57°F | 79°F | 67°F | 3.9" |
| May | 64°F | 85°F | 74°F | 4.8" |
| June | 72°F | 93°F | 82°F | 4.1" |
| July | 75°F | 96°F | 84°F | 2.0" |
| August | 75°F | 98°F | 85°F | 2.5" |
| September | 69°F | 91°F | 79°F | 2.5" |
| October | 58°F | 82°F | 68°F | 4.4" |
| November | 49°F | 70°F | 58°F | 3.0" |
| December | 41°F | 61°F | 50°F | 2.6" |
| Index | Eureka | 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. |
| Caney City, TX | 125 | 41 | 18.0% |
| Log Cabin, TX | 869 | 41 | 18.0% |
| Trinidad, TX | 839 | 41 | 18.0% |
| Navarro, TX | 168 | 41 | 18.0% |
| Streetman, TX | 323 | 41 | 18.0% |
| Eureka, TX | 265 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Letona, AR | 265 | 45 | 10.0% |
| Lonsdale, AR | 265 | 38 | 24.0% |
| Trinity Center, CA | 265 | 42 | 16.0% |
| Garden Prairie, IL | 265 | 42 | 16.0% |
| Arjay, KY | 265 | 39 | 22.0% |
| Eureka, TX | 265 | 41 | 18.0% |
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