| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 67°F | 51°F | 2.5" |
| February | 38°F | 68°F | 52°F | 1.6" |
| March | 40°F | 73°F | 56°F | 1.1" |
| April | 44°F | 77°F | 59°F | 0.8" |
| May | 50°F | 81°F | 64°F | 0.3" |
| June | 55°F | 90°F | 72°F | 0.0" |
| July | 62°F | 95°F | 77°F | 0.3" |
| August | 61°F | 95°F | 77°F | 0.7" |
| September | 58°F | 93°F | 74°F | 0.2" |
| October | 50°F | 83°F | 65°F | 0.3" |
| November | 41°F | 75°F | 57°F | 0.7" |
| December | 36°F | 66°F | 50°F | 2.9" |
| Index | Meadowbrook | 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. |
| French Valley, CA | 39,057 | 89 | 78.0% |
| Canyon Lake, CA | 11,237 | 89 | 78.0% |
| Lake Elsinore, CA | 64,201 | 89 | 78.0% |
| Temescal Valley, CA | 28,420 | 89 | 78.0% |
| El Sobrante CDP (Contra Costa County), CA | 12,963 | 89 | 78.0% |
| Meadowbrook, CA | 4,208 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Arabi, LA | 4,207 | 45 | 10.0% |
| Fort Defiance, AZ | 4,209 | 17 | 66.0% |
| Rigby, ID | 4,209 | 43 | 14.0% |
| Deer Park, WA | 4,209 | 43 | 14.0% |
| Lonoke, AR | 4,206 | 45 | 10.0% |
| Meadowbrook, CA | 4,208 | 89 | 78.0% |
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