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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 69°F | 53°F | 4.6" |
| February | 40°F | 68°F | 54°F | 3.4" |
| March | 44°F | 70°F | 56°F | 1.6" |
| April | 46°F | 72°F | 59°F | 1.3" |
| May | 53°F | 73°F | 62°F | 0.8" |
| June | 57°F | 76°F | 66°F | 0.1" |
| July | 60°F | 80°F | 69°F | 0.2" |
| August | 60°F | 81°F | 69°F | 0.1" |
| September | 57°F | 82°F | 69°F | 0.3" |
| October | 50°F | 79°F | 64°F | 1.2" |
| November | 43°F | 75°F | 57°F | 1.6" |
| December | 38°F | 68°F | 52°F | 3.8" |
| Index | French Valley | 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. |
| Pala, CA | 1,094 | 64 | 28.0% |
| Fallbrook, CA | 32,359 | 64 | 28.0% |
| Murrieta, CA | 114,066 | 89 | 78.0% |
| Good Hope, CA | 8,431 | 89 | 78.0% |
| Lake Elsinore, CA | 64,201 | 89 | 78.0% |
| French Valley, CA | 39,057 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Duncanville, TX | 39,096 | 51 | 2.0% |
| Norwich, CT | 39,112 | 37 | 26.0% |
| Warren, OH | 38,986 | 42 | 16.0% |
| South Valley, NM | 39,150 | 53 | 6.0% |
| Germantown, TN | 39,196 | 45 | 10.0% |
| French Valley, CA | 39,057 | 89 | 78.0% |
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