| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 48°F | 33°F | 0.4" |
| February | 22°F | 51°F | 35°F | 0.4" |
| March | 27°F | 60°F | 43°F | 0.5" |
| April | 33°F | 66°F | 49°F | 0.5" |
| May | 40°F | 73°F | 56°F | 1.7" |
| June | 50°F | 85°F | 67°F | 1.5" |
| July | 54°F | 85°F | 69°F | 3.2" |
| August | 53°F | 83°F | 67°F | 3.2" |
| September | 47°F | 77°F | 61°F | 2.8" |
| October | 37°F | 68°F | 51°F | 1.2" |
| November | 27°F | 58°F | 42°F | 0.4" |
| December | 20°F | 48°F | 33°F | 0.5" |
| Index | Watrous | New Mexico | National |
| Air quality index | 15 | 37 | 42 |
| Pollution index | 408,464 | 2,051,791 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 334 |
| Days with moderate air quality | 24 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Las Vegas, NM | 13,055 | 44 | 12.0% |
| Watrous, NM | 93 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Diomede, AK | 93 | 38 | 24.0% |
| Sun Valley, AZ | 93 | 44 | 12.0% |
| Glasgow, IL | 93 | 40 | 20.0% |
| Sims, IN | 93 | 37 | 26.0% |
| Highland Beach, MD | 93 | 46 | 8.0% |
| Watrous, NM | 93 | 15 | 70.0% |
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