| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 65°F | 52°F | 2.5" |
| February | 45°F | 70°F | 56°F | 1.3" |
| March | 51°F | 77°F | 63°F | 2.8" |
| April | 58°F | 83°F | 70°F | 2.4" |
| May | 65°F | 88°F | 76°F | 4.2" |
| June | 72°F | 95°F | 82°F | 2.2" |
| July | 73°F | 96°F | 83°F | 3.3" |
| August | 73°F | 98°F | 85°F | 2.2" |
| September | 69°F | 93°F | 79°F | 4.1" |
| October | 59°F | 85°F | 71°F | 2.5" |
| November | 51°F | 75°F | 62°F | 1.7" |
| December | 43°F | 66°F | 53°F | 2.1" |
| Index | Geronimo | Texas | National |
| Air quality index | 49 | 52 | 42 |
| Pollution index | 680,332 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 196 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Martindale, TX | 1,059 | 44 | 12.0% |
| San Marcos, TX | 64,053 | 44 | 12.0% |
| Redwood, TX | 3,349 | 44 | 12.0% |
| Staples, TX | 180 | 44 | 12.0% |
| Santa Clara, TX | 766 | 49 | 2.0% |
| Geronimo, TX | 793 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Fieldbrook, CA | 793 | 27 | 46.0% |
| Holly, CO | 793 | 15 | 70.0% |
| Wiscon, FL | 793 | 30 | 40.0% |
| Cuba, NM | 793 | 8 | 84.0% |
| Paraje, NM | 793 | 53 | 6.0% |
| Geronimo, TX | 793 | 49 | 2.0% |
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