| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 61°F | 46°F | 2.9" |
| February | 40°F | 65°F | 51°F | 1.6" |
| March | 48°F | 73°F | 59°F | 2.5" |
| April | 56°F | 81°F | 67°F | 3.6" |
| May | 64°F | 86°F | 74°F | 5.6" |
| June | 72°F | 95°F | 83°F | 4.7" |
| July | 76°F | 98°F | 86°F | 1.4" |
| August | 76°F | 99°F | 87°F | 1.9" |
| September | 67°F | 91°F | 78°F | 2.3" |
| October | 56°F | 82°F | 68°F | 3.2" |
| November | 47°F | 71°F | 57°F | 2.1" |
| December | 38°F | 61°F | 48°F | 1.8" |
| Index | Granbury | Texas | National |
| Air quality index | 33 | 52 | 42 |
| Pollution index | 453,692 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.005% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brazos Bend, TX | 330 | 33 | 34.0% |
| Glen Rose, TX | 2,653 | 33 | 34.0% |
| Tolar, TX | 1,201 | 33 | 34.0% |
| Canyon Creek, TX | 952 | 33 | 34.0% |
| Lipan, TX | 488 | 33 | 34.0% |
| Granbury, TX | 10,325 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairfield, IA | 10,327 | 29 | 42.0% |
| Sauk Village, IL | 10,319 | 55 | 10.0% |
| Hillsdale, NJ | 10,317 | 51 | 2.0% |
| Greencastle, IN | 10,312 | 45 | 10.0% |
| Lyons, IL | 10,338 | 55 | 10.0% |
| Granbury, TX | 10,325 | 33 | 34.0% |
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