| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 60°F | 46°F | 3.6" |
| February | 38°F | 67°F | 53°F | 1.1" |
| March | 45°F | 76°F | 61°F | 2.4" |
| April | 52°F | 81°F | 68°F | 2.6" |
| May | 59°F | 88°F | 74°F | 1.8" |
| June | 71°F | 99°F | 87°F | 3.4" |
| July | 72°F | 96°F | 84°F | 15.5" |
| August | 71°F | 95°F | 83°F | 8.8" |
| September | 65°F | 89°F | 78°F | 11.5" |
| October | 53°F | 82°F | 69°F | 5.8" |
| November | 41°F | 69°F | 56°F | 1.0" |
| December | 33°F | 60°F | 47°F | 3.1" |
| Index | La Union | New Mexico | National |
| Air quality index | 53 | 37 | 42 |
| Pollution index | 4,165,220 | 2,051,791 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 147 |
| Days with moderate air quality | 205 |
| Days w/ poor A.Q. for sensitive groups | 11 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.110% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.200% |
| City | Population | Air Quality Index | National Avg. |
| San Miguel, NM | 1,006 | 51 | 2.0% |
| Vado, NM | 3,189 | 51 | 2.0% |
| La Mesa, NM | 642 | 51 | 2.0% |
| Mesquite, NM | 892 | 51 | 2.0% |
| Fort Bliss, TX | 12,709 | 53 | 6.0% |
| La Union, NM | 907 | 53 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Butte Valley, CA | 907 | 46 | 8.0% |
| Melville, LA | 907 | 41 | 18.0% |
| Liberty, MS | 907 | 30 | 40.0% |
| Schaefferstown, PA | 907 | 42 | 16.0% |
| Graniteville, VT | 907 | 34 | 32.0% |
| La Union, NM | 907 | 53 | 6.0% |
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