| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 2.4" |
| February | 42°F | 64°F | 52°F | 1.9" |
| March | 46°F | 70°F | 57°F | 1.7" |
| April | 49°F | 76°F | 61°F | 1.3" |
| May | 54°F | 85°F | 69°F | 0.4" |
| June | 60°F | 93°F | 76°F | 0.2" |
| July | 64°F | 98°F | 80°F | 0.0" |
| August | 63°F | 96°F | 78°F | 0.0" |
| September | 59°F | 91°F | 74°F | 0.1" |
| October | 52°F | 80°F | 64°F | 0.7" |
| November | 44°F | 68°F | 54°F | 1.1" |
| December | 38°F | 58°F | 47°F | 2.3" |
| Index | Valley Home | California | National |
| Air quality index | 55 | 55 | 50 |
| Pollution index | 7,774,440 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 164 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 45 |
| Days with unhealthy air quality | 11 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.050% |
| Mercury | 0.040% |
| City, State | Population | Air Quality Index | National Avg. |
| Copperopolis, CA | 4,099 | 39 | 22% |
| Rouse, CA | 2,051 | 55 | 10% |
| West Modesto, CA | 5,274 | 55 | 10% |
| Del Rio, CA | 1,577 | 55 | 10% |
| Oakdale, CA | 21,796 | 55 | 10% |
| Valley Home, CA | 266 | 55 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Newburg, PA | 266 | 36 | 28% |
| Coffee City, TX | 266 | 35 | 30% |
| Edmondson, AR | 266 | 44 | 12% |
| Oneida, KY | 266 | 36 | 28% |
| Switz City, IN | 266 | 7 | 86% |
| Valley Home, CA | 266 | 55 | 10% |