| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 63°F | 50°F | 3.5" |
| February | 42°F | 68°F | 54°F | 3.1" |
| March | 47°F | 75°F | 61°F | 1.5" |
| April | 52°F | 81°F | 66°F | 0.8" |
| May | 61°F | 90°F | 75°F | 0.3" |
| June | 71°F | 100°F | 86°F | 0.1" |
| July | 78°F | 104°F | 91°F | 10.3" |
| August | 75°F | 102°F | 89°F | 6.5" |
| September | 68°F | 96°F | 82°F | 5.2" |
| October | 56°F | 84°F | 70°F | 2.7" |
| November | 46°F | 72°F | 58°F | 3.1" |
| December | 38°F | 61°F | 49°F | 4.7" |
| Index | Joshua Tree | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 31,575,300 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 42 |
| Days with moderate air quality | 178 |
| Days w/ poor A.Q. for sensitive groups | 79 |
| Days with unhealthy air quality | 58 |
| Pollutant | Total |
| Arsenic | 0.110% |
| Benzene | 0.260% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.350% |
| Mercury | 0.280% |
| City | Population | Air Quality Index | National Avg. |
| Twentynine Palms, CA | 26,748 | 89 | 78.0% |
| Yucca Valley, CA | 21,701 | 89 | 78.0% |
| Homestead Valley, CA | 2,619 | 89 | 78.0% |
| Desert Hot Springs, CA | 29,280 | 89 | 78.0% |
| Joshua Tree, CA | 7,786 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Navasota, TX | 7,786 | 52 | 4.0% |
| Mantua, VA | 7,784 | 47 | 6.0% |
| Austell, GA | 7,783 | 52 | 4.0% |
| Bloomfield, NM | 7,791 | 49 | 2.0% |
| Manhasset, NY | 7,792 | 51 | 2.0% |
| Joshua Tree, CA | 7,786 | 89 | 78.0% |
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