| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 65°F | 52°F | 3.2" |
| February | 46°F | 69°F | 56°F | 2.4" |
| March | 53°F | 75°F | 63°F | 3.6" |
| April | 60°F | 81°F | 70°F | 4.6" |
| May | 66°F | 86°F | 76°F | 5.4" |
| June | 73°F | 93°F | 82°F | 4.5" |
| July | 74°F | 94°F | 83°F | 4.5" |
| August | 74°F | 95°F | 84°F | 6.2" |
| September | 70°F | 91°F | 79°F | 3.3" |
| October | 59°F | 83°F | 70°F | 5.2" |
| November | 51°F | 74°F | 61°F | 3.4" |
| December | 45°F | 66°F | 54°F | 3.0" |
| Index | Magnolia | 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. |
| Waller, TX | 3,276 | 52 | 4.0% |
| Montgomery, TX | 2,204 | 52 | 4.0% |
| Tomball, TX | 11,689 | 52 | 4.0% |
| Prairie View, TX | 6,813 | 52 | 4.0% |
| Pinehurst, TX | 5,030 | 52 | 4.0% |
| Magnolia, TX | 2,802 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Island Walk, FL | 2,802 | 34 | 32.0% |
| Almont, MI | 2,802 | 38 | 24.0% |
| Pine Mountain Lake, CA | 2,801 | 39 | 22.0% |
| Bloomingdale, GA | 2,801 | 39 | 22.0% |
| Montague, MI | 2,801 | 38 | 24.0% |
| Magnolia, TX | 2,802 | 52 | 4.0% |
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