| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 71°F | 58°F | 1.1" |
| February | 49°F | 76°F | 62°F | 0.5" |
| March | 54°F | 83°F | 69°F | 0.2" |
| April | 58°F | 88°F | 73°F | 0.1" |
| May | 65°F | 96°F | 80°F | 0.0" |
| June | 73°F | 106°F | 90°F | 0.0" |
| July | 80°F | 109°F | 94°F | 0.3" |
| August | 79°F | 108°F | 94°F | 0.3" |
| September | 74°F | 103°F | 88°F | 0.3" |
| October | 63°F | 91°F | 77°F | 0.1" |
| November | 54°F | 80°F | 67°F | 0.1" |
| December | 45°F | 70°F | 57°F | 1.0" |
| Index | Mountain Center | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 22,790,900 | 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 | 0.060% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.220% |
| Mercury | 0.230% |
| City | Population | Air Quality Index | National Avg. |
| Lake Riverside, CA | 1,139 | 89 | 78.0% |
| Idyllwild-Pine Cove, CA | 2,963 | 89 | 78.0% |
| Garnet, CA | 5,567 | 89 | 78.0% |
| Whitewater, CA | 1,166 | 89 | 78.0% |
| San Jacinto, CA | 48,786 | 89 | 78.0% |
| Mountain Center, CA | 17 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Elfin Cove, AK | 17 | 20 | 60.0% |
| McMullen, AL | 17 | 35 | 30.0% |
| Lupton, AZ | 17 | 17 | 66.0% |
| Time, IL | 17 | 41 | 18.0% |
| Cedar, KS | 17 | 19 | 62.0% |
| Mountain Center, CA | 17 | 89 | 78.0% |
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