| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 60°F | 48°F | 3.6" |
| February | 42°F | 63°F | 51°F | 2.8" |
| March | 49°F | 71°F | 59°F | 4.3" |
| April | 56°F | 79°F | 67°F | 3.8" |
| May | 64°F | 84°F | 73°F | 4.4" |
| June | 72°F | 92°F | 81°F | 3.9" |
| July | 75°F | 95°F | 83°F | 2.8" |
| August | 75°F | 96°F | 84°F | 3.5" |
| September | 68°F | 90°F | 78°F | 3.1" |
| October | 57°F | 81°F | 67°F | 4.4" |
| November | 48°F | 70°F | 58°F | 3.4" |
| December | 41°F | 61°F | 49°F | 4.0" |
| Index | Grand Saline | Texas | National |
| Air quality index | 36 | 52 | 42 |
| Pollution index | 37,723,200 | 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 | 0.060% |
| Benzene | 0.290% |
| Carbon Tetrachloride | 0.220% |
| Lead | 0.230% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Fruitvale, TX | 561 | 36 | 28.0% |
| Edgewood, TX | 1,759 | 36 | 28.0% |
| Van, TX | 2,706 | 36 | 28.0% |
| Hideaway, TX | 3,157 | 36 | 28.0% |
| Myrtle Springs, TX | 473 | 36 | 28.0% |
| Grand Saline, TX | 3,148 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Haviland, NY | 3,148 | 36 | 28.0% |
| Union City, PA | 3,148 | 36 | 28.0% |
| Cashmere, WA | 3,148 | 24 | 52.0% |
| Wesleyville, PA | 3,147 | 36 | 28.0% |
| Hamburg, NJ | 3,149 | 34 | 32.0% |
| Grand Saline, TX | 3,148 | 36 | 28.0% |
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