| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 63°F | 52°F | 2.4" |
| February | 46°F | 67°F | 55°F | 2.9" |
| March | 53°F | 74°F | 62°F | 3.6" |
| April | 60°F | 80°F | 69°F | 2.5" |
| May | 67°F | 86°F | 75°F | 5.1" |
| June | 73°F | 93°F | 82°F | 2.7" |
| July | 75°F | 94°F | 83°F | 1.7" |
| August | 75°F | 96°F | 84°F | 4.8" |
| September | 70°F | 90°F | 79°F | 2.9" |
| October | 60°F | 83°F | 70°F | 2.7" |
| November | 52°F | 73°F | 61°F | 3.1" |
| December | 46°F | 65°F | 54°F | 3.1" |
| Index | Navasota | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 898,232 | 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 | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Anderson, TX | 240 | 52 | 4.0% |
| Millican, TX | 274 | 52 | 4.0% |
| Navasota, TX | 7,993 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Providence, UT | 7,993 | 44 | 12.0% |
| Webster City, IA | 7,995 | 37 | 26.0% |
| Argyle, NS | 7,989 | n/a | |
| Bluewater, ON | 7,997 | n/a | |
| Livingston, MT | 7,998 | 25 | 50.0% |
| Navasota, TX | 7,993 | 52 | 4.0% |