| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 3.3" |
| February | 41°F | 63°F | 51°F | 3.1" |
| March | 44°F | 68°F | 55°F | 2.9" |
| April | 47°F | 74°F | 59°F | 1.8" |
| May | 52°F | 82°F | 65°F | 0.5" |
| June | 57°F | 90°F | 71°F | 0.3" |
| July | 59°F | 95°F | 74°F | 0.0" |
| August | 58°F | 93°F | 73°F | 0.0" |
| September | 56°F | 90°F | 70°F | 0.1" |
| October | 50°F | 79°F | 63°F | 1.2" |
| November | 43°F | 66°F | 53°F | 1.6" |
| December | 38°F | 57°F | 47°F | 3.8" |
| Index | Willowcreek | Sacramento | California |
| Air quality index | 52 | 52 | 55 |
| Pollution index | 15,476,500 | 15,476,500 | 10,473,190 |
| 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 | 0.090% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.130% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Clarksburg, CA | 366 | 52 | 4.0% |
| West Sacramento, CA | 53,574 | 52 | 4.0% |
| Arden-Arcade, CA | 93,719 | 52 | 4.0% |
| Foothill Farms, CA | 35,711 | 52 | 4.0% |
| Rancho Cordova, CA | 74,394 | 52 | 4.0% |
| Sacramento, CA | 503,482 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Mesa, AZ | 508,918 | 74 | 48.0% |
| Atlanta, GA | 497,642 | 52 | 4.0% |
| Kansas City, MO | 491,158 | 47 | 6.0% |
| Fresno, CA | 526,147 | 60 | 20.0% |
| Omaha, NE | 479,529 | 40 | 20.0% |
| Sacramento, CA | 503,482 | 52 | 4.0% |
Here are the best places to live in California
Check out the 10 safest cities in California
These are the largest cities in California
Check out the 10 most dangerous cities in California