| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 46°F | 29°F | 0.9" |
| February | 19°F | 51°F | 34°F | 0.6" |
| March | 23°F | 61°F | 42°F | 0.4" |
| April | 29°F | 67°F | 48°F | 0.5" |
| May | 36°F | 75°F | 57°F | 0.7" |
| June | 46°F | 88°F | 69°F | 0.3" |
| July | 55°F | 89°F | 72°F | 1.9" |
| August | 53°F | 86°F | 69°F | 1.8" |
| September | 44°F | 81°F | 62°F | 1.4" |
| October | 31°F | 70°F | 50°F | 0.9" |
| November | 20°F | 59°F | 38°F | 0.5" |
| December | 15°F | 46°F | 29°F | 1.0" |
| Index | Gallup | New Mexico | National |
| Air quality index | 17 | 37 | 42 |
| Pollution index | 5,861,710 | 2,051,791 | 2,726,193 |
| Measurement | Total |
| Days measured | 128 |
| Days with good air quality | 127 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.310% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.090% |
| Mercury | 0.250% |
| City | Population | Air Quality Index | National Avg. |
| Yah-ta-hey, NM | 627 | 17 | 66.0% |
| Church Rock, NM | 1,354 | 17 | 66.0% |
| Rock Springs, NM | 1,166 | 17 | 66.0% |
| Twin Lakes, NM | 1,119 | 17 | 66.0% |
| Gallup, NM | 21,637 | 17 | 66.0% |
| City | Population | Air Quality Index | National Avg. |
| Sedalia, MO | 21,634 | 38 | 24.0% |
| Coralville, IA | 21,630 | 35 | 30.0% |
| Lealman, FL | 21,621 | 43 | 14.0% |
| Albertville, AL | 21,620 | 43 | 14.0% |
| Prichard, AL | 21,618 | 42 | 16.0% |
| Gallup, NM | 21,637 | 17 | 66.0% |
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