| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 60°F | 44°F | 0.9" |
| February | 36°F | 66°F | 48°F | 0.6" |
| March | 45°F | 76°F | 58°F | 0.6" |
| April | 53°F | 83°F | 66°F | 1.3" |
| May | 60°F | 88°F | 73°F | 2.0" |
| June | 70°F | 96°F | 82°F | 1.2" |
| July | 72°F | 95°F | 83°F | 1.8" |
| August | 71°F | 95°F | 82°F | 1.2" |
| September | 65°F | 88°F | 75°F | 2.1" |
| October | 54°F | 81°F | 66°F | 1.5" |
| November | 43°F | 70°F | 55°F | 0.6" |
| December | 34°F | 61°F | 45°F | 0.7" |
| Index | Forsan | Texas | National |
| Air quality index | 28 | 52 | 42 |
| Pollution index | 235,974 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 319 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Coahoma, TX | 783 | 28 | 44.0% |
| Sand Springs, TX | 746 | 28 | 44.0% |
| Big Spring, TX | 27,878 | 28 | 44.0% |
| Forsan, TX | 449 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Seville, CA | 449 | 66 | 32.0% |
| Victor, CO | 449 | 16 | 68.0% |
| Houston, DE | 449 | 42 | 16.0% |
| Humeston, IA | 449 | 39 | 22.0% |
| Waveland, IN | 449 | 45 | 10.0% |
| Forsan, TX | 449 | 28 | 44.0% |
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