| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 55°F | 37°F | 0.8" |
| February | 25°F | 59°F | 40°F | 0.7" |
| March | 34°F | 69°F | 50°F | 1.2" |
| April | 41°F | 76°F | 57°F | 1.4" |
| May | 50°F | 83°F | 66°F | 2.7" |
| June | 62°F | 93°F | 77°F | 2.4" |
| July | 65°F | 94°F | 79°F | 3.5" |
| August | 64°F | 92°F | 77°F | 4.2" |
| September | 57°F | 86°F | 70°F | 2.0" |
| October | 44°F | 77°F | 59°F | 1.7" |
| November | 33°F | 67°F | 48°F | 0.7" |
| December | 24°F | 55°F | 37°F | 0.7" |
| Index | Groom | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 486,293 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 259 |
| Days with moderate air quality | 96 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Howardwick, TX | 417 | 44 | 12.0% |
| Claude, TX | 1,358 | 44 | 12.0% |
| Groom, TX | 499 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Shishmaref, AK | 499 | 38 | 24.0% |
| Midway, AL | 499 | 52 | 4.0% |
| Wilmot, AR | 499 | 34 | 32.0% |
| Ephesus, GA | 499 | 38 | 24.0% |
| Sorento, IL | 499 | 54 | 8.0% |
| Groom, TX | 499 | 44 | 12.0% |
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