| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 57°F | 46°F | 3.3" |
| February | 40°F | 63°F | 51°F | 2.9" |
| March | 43°F | 68°F | 55°F | 2.6" |
| April | 46°F | 74°F | 59°F | 1.6" |
| May | 51°F | 83°F | 66°F | 0.5" |
| June | 57°F | 91°F | 72°F | 0.3" |
| July | 59°F | 96°F | 76°F | 0.0" |
| August | 58°F | 94°F | 74°F | 0.0" |
| September | 55°F | 91°F | 71°F | 0.1" |
| October | 49°F | 80°F | 63°F | 0.9" |
| November | 42°F | 66°F | 53°F | 1.8" |
| December | 37°F | 57°F | 46°F | 3.4" |
| Index | Monument Hills | California | National |
| Air quality index | 52 | 55 | 50 |
| Pollution index | 3,319,120 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 171 |
| Days with moderate air quality | 173 |
| Days w/ poor A.Q. for sensitive groups | 21 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.100% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.070% |
| Mercury | 0.120% |
| City, State | Population | Air Quality Index | National Avg. |
| Esparto, CA | 3,618 | 35 | 30% |
| Winters, CA | 6,974 | 35 | 30% |
| Robbins, CA | 322 | 44 | 12% |
| Dixon, CA | 19,144 | 52 | 4% |
| University of California-Davis, CA | 6,957 | 52 | 4% |
| Monument Hills, CA | 1,864 | 52 | 4% |
| City, State | Population | Air Quality Index | National Avg. |
| Armada, MI | 1,864 | 56 | 12% |
| Sneads, FL | 1,864 | 40 | 20% |
| Chepachet, RI | 1,863 | 44 | 12% |
| Haskell, OK | 1,863 | 5 | 90% |
| Edgewood, IN | 1,863 | 42 | 16% |
| Monument Hills, CA | 1,864 | 52 | 4% |
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