| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 66°F | 55°F | 3.7" |
| February | 49°F | 69°F | 58°F | 2.4" |
| March | 56°F | 75°F | 65°F | 3.2" |
| April | 62°F | 80°F | 71°F | 5.0" |
| May | 69°F | 86°F | 77°F | 4.7" |
| June | 75°F | 92°F | 83°F | 4.2" |
| July | 76°F | 93°F | 84°F | 5.7" |
| August | 77°F | 94°F | 84°F | 7.4" |
| September | 73°F | 90°F | 81°F | 4.1" |
| October | 63°F | 84°F | 73°F | 5.3" |
| November | 54°F | 75°F | 64°F | 4.1" |
| December | 49°F | 67°F | 57°F | 3.8" |
| Index | Friendswood | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 701,652 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Alvin, TX | 27,527 | 52 | 4.0% |
| Liverpool, TX | 533 | 52 | 4.0% |
| Southside Place, TX | 1,561 | 52 | 4.0% |
| El Lago, TX | 2,887 | 52 | 4.0% |
| Pasadena, TX | 157,942 | 52 | 4.0% |
| Friendswood, TX | 40,785 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Keizer, OR | 40,787 | 32 | 36.0% |
| Columbia, TN | 40,814 | 31 | 38.0% |
| Marlborough, MA | 40,753 | 40 | 20.0% |
| Sumter, SC | 40,739 | 43 | 14.0% |
| Germantown, TN | 40,725 | 45 | 10.0% |
| Friendswood, TX | 40,785 | 52 | 4.0% |
Here are the best places to live in Texas
Most Dangerous Cities In The US
Check out the 10 most dangerous cities in Texas
Most Dangerous States In The US