| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 58°F | 48°F | 5.9" |
| February | 43°F | 62°F | 51°F | 8.6" |
| March | 51°F | 70°F | 59°F | 10.9" |
| April | 57°F | 77°F | 66°F | 4.6" |
| May | 64°F | 83°F | 72°F | 1.5" |
| June | 72°F | 90°F | 80°F | 4.8" |
| July | 73°F | 92°F | 82°F | 4.2" |
| August | 74°F | 93°F | 83°F | 5.8" |
| September | 69°F | 88°F | 77°F | 6.7" |
| October | 59°F | 79°F | 68°F | 10.3" |
| November | 50°F | 68°F | 58°F | 0.2" |
| December | 43°F | 60°F | 50°F | 7.2" |
| Index | Alto | Texas | National |
| Air quality index | 36 | 52 | 42 |
| Pollution index | 1,202,460 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 326 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| 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. |
| Reklaw, TX | 374 | 36 | 28.0% |
| Rusk, TX | 5,598 | 36 | 28.0% |
| Wells, TX | 899 | 36 | 28.0% |
| Cushing, TX | 652 | 36 | 28.0% |
| Alto, TX | 1,099 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Roberta, GA | 1,099 | 38 | 24.0% |
| Sandoval, IL | 1,099 | 43 | 14.0% |
| Saint-Maxime-du-Mont-Louis, QC | 1,099 | n/a | |
| Saint-Hilarion, QC | 1,099 | n/a | |
| Kanesatake, QC | 1,099 | n/a | |
| Alto, TX | 1,099 | 36 | 28.0% |
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