| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 63°F | 47°F | 2.9" |
| February | 39°F | 67°F | 52°F | 2.1" |
| March | 47°F | 74°F | 60°F | 4.2" |
| April | 54°F | 81°F | 67°F | 3.7" |
| May | 62°F | 87°F | 74°F | 5.5" |
| June | 71°F | 95°F | 83°F | 3.7" |
| July | 74°F | 98°F | 85°F | 2.2" |
| August | 74°F | 99°F | 86°F | 2.3" |
| September | 67°F | 93°F | 79°F | 3.5" |
| October | 55°F | 84°F | 69°F | 4.5" |
| November | 46°F | 73°F | 59°F | 2.3" |
| December | 37°F | 63°F | 49°F | 1.9" |
| Index | Mount Calm | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 1,309,490 | 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 | 0.430% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.390% |
| City | Population | Air Quality Index | National Avg. |
| Mart, TX | 1,881 | 38 | 24.0% |
| West, TX | 2,879 | 38 | 24.0% |
| Bellmead, TX | 10,763 | 38 | 24.0% |
| Abbott, TX | 354 | 38 | 24.0% |
| Lacy-Lakeview, TX | 6,698 | 38 | 24.0% |
| Mount Calm, TX | 338 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Northway, AK | 338 | 38 | 24.0% |
| Tununak, AK | 338 | 31 | 38.0% |
| St. Charles, AR | 338 | 43 | 14.0% |
| Strawberry, AR | 338 | 45 | 10.0% |
| Winkelman, AZ | 338 | 47 | 6.0% |
| Mount Calm, TX | 338 | 38 | 24.0% |
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