| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 59°F | 46°F | 1.8" |
| February | 40°F | 65°F | 52°F | 1.8" |
| March | 47°F | 74°F | 60°F | 0.9" |
| April | 53°F | 81°F | 66°F | 1.6" |
| May | 61°F | 90°F | 76°F | 1.2" |
| June | 73°F | 102°F | 88°F | 1.7" |
| July | 80°F | 106°F | 93°F | 2.1" |
| August | 77°F | 103°F | 90°F | 3.0" |
| September | 68°F | 96°F | 82°F | 2.5" |
| October | 56°F | 83°F | 68°F | 2.0" |
| November | 44°F | 70°F | 56°F | 1.8" |
| December | 35°F | 57°F | 45°F | 2.7" |
| Index | Foothills | Henderson | Nevada |
| Air quality index | 54 | 54 | 38 |
| Pollution index | 5,460,430 | 5,460,430 | 2,601,914 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 154 |
| Days with moderate air quality | 206 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Whitney, NV | 44,488 | 54 | 8.0% |
| Nellis AFB, NV | 3,770 | 54 | 8.0% |
| Winchester, NV | 36,302 | 54 | 8.0% |
| North Las Vegas, NV | 247,248 | 54 | 8.0% |
| Boulder City, NV | 16,048 | 54 | 8.0% |
| Henderson, NV | 309,955 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Stockton, CA | 311,103 | 45 | 10.0% |
| St. Paul, MN | 305,877 | 46 | 8.0% |
| St. Louis, MO | 304,709 | 54 | 8.0% |
| Cincinnati, OH | 302,687 | 54 | 8.0% |
| Pittsburgh, PA | 301,286 | 56 | 12.0% |
| Henderson, NV | 309,955 | 54 | 8.0% |
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