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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 49°F | 41°F | 9.3" |
| February | 35°F | 51°F | 42°F | 4.3" |
| March | 44°F | 66°F | 54°F | 5.7" |
| April | 50°F | 70°F | 59°F | 5.8" |
| May | 61°F | 83°F | 72°F | 3.6" |
| June | 69°F | 90°F | 79°F | 5.8" |
| July | 70°F | 89°F | 79°F | 8.1" |
| August | 72°F | 96°F | 83°F | 10.3" |
| September | 65°F | 87°F | 75°F | 7.4" |
| October | 54°F | 76°F | 63°F | 13.9" |
| November | 43°F | 63°F | 52°F | 6.9" |
| December | 33°F | 51°F | 41°F | 6.4" |
| Index | Garland | Tennessee | National |
| Air quality index | 45 | 76 | 42 |
| Pollution index | 303,319 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 221 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.005% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Covington, TN | 8,863 | 26 | 48.0% |
| Luxora, AR | 985 | 26 | 48.0% |
| Henning, TN | 1,177 | 26 | 48.0% |
| Ripley, TN | 7,852 | 26 | 48.0% |
| Burlison, TN | 331 | 45 | 10.0% |
| Garland, TN | 329 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Maysville, AR | 329 | 44 | 12.0% |
| Lake Almanor West, CA | 329 | 46 | 8.0% |
| Russellville, IN | 329 | 45 | 10.0% |
| Grainfield, KS | 329 | 15 | 70.0% |
| Clarence, LA | 329 | 30 | 40.0% |
| Garland, TN | 329 | 45 | 10.0% |
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