| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 60°F | 49°F | 0.6" |
| February | 43°F | 66°F | 54°F | 0.5" |
| March | 50°F | 75°F | 62°F | 0.2" |
| April | 55°F | 82°F | 68°F | 0.2" |
| May | 65°F | 91°F | 78°F | 0.1" |
| June | 76°F | 102°F | 90°F | 0.0" |
| July | 82°F | 107°F | 94°F | 0.3" |
| August | 79°F | 104°F | 92°F | 0.5" |
| September | 72°F | 96°F | 84°F | 0.4" |
| October | 59°F | 83°F | 71°F | 0.5" |
| November | 48°F | 71°F | 59°F | 0.2" |
| December | 39°F | 59°F | 48°F | 0.5" |
| Index | Winchester | Nevada | National |
| Air quality index | 54 | 38 | 50 |
| Pollution index | 5,460,430 | 4,261,773 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Enterprise, NV | 129,620 | 54 | 8% |
| North Las Vegas, NV | 230,436 | 54 | 8% |
| Sunrise Manor, NV | 192,873 | 54 | 8% |
| Henderson, NV | 277,872 | 54 | 8% |
| Paradise, NV | 229,666 | 54 | 8% |
| Winchester, NV | 27,986 | 54 | 8% |
| City, State | Population | Air Quality Index | National Avg. |
| Bella Vista, AR | 27,985 | 44 | 12% |
| Redmond, OR | 27,998 | 20 | 60% |
| Woodstock, GA | 27,964 | 52 | 4% |
| Oakdale, MN | 27,956 | 46 | 8% |
| Central, LA | 28,017 | 45 | 10% |
| Winchester, NV | 27,986 | 54 | 8% |
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