| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 64°F | 51°F | 3.7" |
| February | 46°F | 69°F | 56°F | 2.5" |
| March | 53°F | 75°F | 63°F | 3.7" |
| April | 60°F | 82°F | 70°F | 2.5" |
| May | 65°F | 86°F | 75°F | 7.1" |
| June | 73°F | 93°F | 82°F | 3.1" |
| July | 75°F | 96°F | 85°F | 1.9" |
| August | 76°F | 98°F | 86°F | 4.5" |
| September | 71°F | 92°F | 81°F | 3.3" |
| October | 61°F | 84°F | 71°F | 3.4" |
| November | 51°F | 73°F | 61°F | 3.1" |
| December | 45°F | 65°F | 54°F | 3.5" |
| Index | Millican | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 483,161 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 171 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 26 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bryan, TX | 85,645 | 38 | 24.0% |
| College Station, TX | 115,802 | 52 | 4.0% |
| Anderson, TX | 235 | 52 | 4.0% |
| Navasota, TX | 7,786 | 52 | 4.0% |
| Millican, TX | 263 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Cooper Landing, AK | 263 | 31 | 38.0% |
| Lemon Cove, CA | 263 | 66 | 32.0% |
| Hancock, IA | 263 | 40 | 20.0% |
| Randolph, IA | 263 | 40 | 20.0% |
| Stanley, ID | 263 | 36 | 28.0% |
| Millican, TX | 263 | 52 | 4.0% |
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