| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 64°F | 50°F | 3.8" |
| February | 43°F | 67°F | 54°F | 2.7" |
| March | 50°F | 74°F | 61°F | 3.4" |
| April | 57°F | 81°F | 68°F | 3.5" |
| May | 64°F | 86°F | 74°F | 5.7" |
| June | 70°F | 92°F | 80°F | 4.1" |
| July | 72°F | 94°F | 82°F | 4.0" |
| August | 73°F | 95°F | 82°F | 4.3" |
| September | 67°F | 90°F | 77°F | 2.9" |
| October | 57°F | 83°F | 68°F | 4.8" |
| November | 49°F | 73°F | 59°F | 4.3" |
| December | 43°F | 65°F | 52°F | 3.2" |
| Index | Shepherd | Texas | National |
| Air quality index | 52 | 52 | 42 |
| Pollution index | 99,643 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 171 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 26 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Big Thicket Lake Estates, TX | 611 | 45 | 10.0% |
| Goodrich, TX | 310 | 45 | 10.0% |
| North Cleveland, TX | 283 | 52 | 4.0% |
| Cleveland, TX | 8,150 | 52 | 4.0% |
| West Livingston, TX | 7,873 | 52 | 4.0% |
| Shepherd, TX | 2,489 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Orchard Lake Village, MI | 2,489 | 56 | 12.0% |
| Leavenworth, WA | 2,489 | 24 | 52.0% |
| Meadow Lake No. 588, SK | 2,489 | n/a | |
| Pine Air, FL | 2,488 | 36 | 28.0% |
| Lithonia, GA | 2,488 | 52 | 4.0% |
| Shepherd, TX | 2,489 | 52 | 4.0% |
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