| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 55°F | 45°F | 6.9" |
| February | 41°F | 61°F | 50°F | 2.8" |
| March | 49°F | 71°F | 59°F | 14.0" |
| April | 53°F | 75°F | 63°F | 2.3" |
| May | 63°F | 82°F | 72°F | 6.7" |
| June | 72°F | 91°F | 80°F | 13.0" |
| July | 72°F | 92°F | 81°F | 10.5" |
| August | 74°F | 96°F | 84°F | 8.4" |
| September | 69°F | 92°F | 80°F | 11.0" |
| October | 57°F | 81°F | 67°F | 4.0" |
| November | 50°F | 72°F | 60°F | 7.2" |
| December | 37°F | 60°F | 47°F | 5.3" |
| Index | Elmo | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 37,723,200 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 181 |
| Days with moderate air quality | 155 |
| Days w/ poor A.Q. for sensitive groups | 28 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.290% |
| Carbon Tetrachloride | 0.220% |
| Lead | 0.230% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Myrtle Springs, TX | 473 | 36 | 28.0% |
| Hawk Cove, TX | 427 | 51 | 2.0% |
| Union Valley, TX | 528 | 51 | 2.0% |
| Oak Grove, TX | 646 | 51 | 2.0% |
| Talty, TX | 2,597 | 51 | 2.0% |
| Elmo, TX | 1,729 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Big Beaver, PA | 1,729 | 31 | 38.0% |
| Thomaston, CT | 1,730 | 37 | 26.0% |
| Hebron, IL | 1,730 | 37 | 26.0% |
| Oberlin, KS | 1,730 | 19 | 62.0% |
| Wardsville, MO | 1,728 | 39 | 22.0% |
| Elmo, TX | 1,729 | 51 | 2.0% |
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