| 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 | Hempstead | 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% |
| Todd Mission, TX | 123 | 52 | 4.0% |
| Prairie View, TX | 6,813 | 52 | 4.0% |
| Bellville, TX | 4,228 | 52 | 4.0% |
| Pine Island, TX | 1,483 | 52 | 4.0% |
| Hempstead, TX | 8,056 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairwood CDP (Spokane County), WA | 8,055 | 45 | 10.0% |
| Crete, IL | 8,058 | 55 | 10.0% |
| London, KY | 8,058 | 40 | 20.0% |
| Kings, Subd. C, NS | 8,052 | n/a | |
| Sutherlin, OR | 8,060 | 24 | 52.0% |
| Hempstead, TX | 8,056 | 52 | 4.0% |
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