| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 59°F | 47°F | 6.5" |
| February | 43°F | 65°F | 52°F | 3.7" |
| March | 51°F | 74°F | 60°F | 12.3" |
| April | 54°F | 78°F | 64°F | 2.2" |
| May | 63°F | 83°F | 72°F | 15.7" |
| June | 71°F | 91°F | 80°F | 16.5" |
| July | 73°F | 95°F | 82°F | 6.5" |
| August | 74°F | 97°F | 84°F | 17.3" |
| September | 70°F | 96°F | 81°F | 2.8" |
| October | 57°F | 85°F | 69°F | 4.3" |
| November | 50°F | 75°F | 60°F | 7.3" |
| December | 37°F | 65°F | 49°F | 0.8" |
| Index | Marlin | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 4,190,870 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.060% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Robinson, TX | 11,806 | 38 | 24.0% |
| Bremond, TX | 981 | 38 | 24.0% |
| Golinda, TX | 656 | 38 | 24.0% |
| Chilton, TX | 671 | 38 | 24.0% |
| Riesel, TX | 1,349 | 38 | 24.0% |
| Marlin, TX | 5,602 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Williamson, AZ | 5,602 | 43 | 14.0% |
| Trent Lakes, ON | 5,602 | n/a | |
| Brookshire, TX | 5,601 | 52 | 4.0% |
| Wayne, NE | 5,603 | 35 | 30.0% |
| Waimanalo, HI | 5,599 | 30 | 40.0% |
| Marlin, TX | 5,602 | 38 | 24.0% |
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