| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 61°F | 51°F | 8.4" |
| February | 47°F | 65°F | 55°F | 5.0" |
| March | 54°F | 74°F | 63°F | 7.9" |
| April | 57°F | 78°F | 66°F | 5.5" |
| May | 66°F | 86°F | 75°F | 8.9" |
| June | 74°F | 93°F | 83°F | 4.7" |
| July | 74°F | 93°F | 82°F | 8.0" |
| August | 75°F | 95°F | 84°F | 10.3" |
| September | 71°F | 92°F | 80°F | 5.8" |
| October | 58°F | 82°F | 69°F | 4.4" |
| November | 52°F | 74°F | 62°F | 9.7" |
| December | 43°F | 65°F | 53°F | 3.3" |
| Index | Huntsville | 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. |
| Riverside, TX | 458 | 52 | 4.0% |
| New Waverly, TX | 909 | 52 | 4.0% |
| Oakhurst, TX | 175 | 52 | 4.0% |
| Huntsville, TX | 41,664 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Puyallup, WA | 41,666 | 30 | 40.0% |
| Oakley, CA | 41,656 | 45 | 10.0% |
| Westfield, IN | 41,652 | 54 | 8.0% |
| La Quinta, CA | 41,650 | 89 | 78.0% |
| Mableton, GA | 41,647 | 52 | 4.0% |
| Huntsville, TX | 41,664 | 52 | 4.0% |
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