| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 61°F | 49°F | 5.4" |
| February | 42°F | 64°F | 52°F | 4.6" |
| March | 50°F | 73°F | 60°F | 4.6" |
| April | 57°F | 79°F | 67°F | 5.9" |
| May | 63°F | 85°F | 73°F | 4.7" |
| June | 71°F | 92°F | 80°F | 4.0" |
| July | 73°F | 93°F | 81°F | 4.4" |
| August | 73°F | 94°F | 82°F | 3.5" |
| September | 67°F | 89°F | 76°F | 3.0" |
| October | 55°F | 81°F | 67°F | 5.7" |
| November | 47°F | 71°F | 57°F | 4.5" |
| December | 43°F | 63°F | 51°F | 5.4" |
| Index | Milam | Texas | National |
| Air quality index | 39 | 52 | 42 |
| Pollution index | 1,390,820 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hemphill, TX | 1,372 | 39 | 22.0% |
| Zwolle, LA | 2,386 | 39 | 22.0% |
| Pineland, TX | 1,121 | 45 | 10.0% |
| Milam, TX | 1,809 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Smackover, AR | 1,809 | 35 | 30.0% |
| Lost Hills, CA | 1,809 | 67 | 34.0% |
| Ogden, IA | 1,809 | 37 | 26.0% |
| Saticoy, CA | 1,808 | 46 | 8.0% |
| Elizabeth, CO | 1,808 | 58 | 16.0% |
| Milam, TX | 1,809 | 39 | 22.0% |