| 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 | Roseville | California | National |
| Air quality index | 52 | 55 | 42 |
| Pollution index | 15,476,500 | 10,473,190 | 2,726,193 |
| 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. |
| Nicolaus, CA | 124 | 44 | 12.0% |
| Rio Oso, CA | 414 | 44 | 12.0% |
| East Nicolaus, CA | 172 | 44 | 12.0% |
| Sheridan, CA | 1,120 | 44 | 12.0% |
| Trowbridge, CA | 196 | 44 | 12.0% |
| Roseville, CA | 138,860 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Trois-Rivières, QC | 138,766 | n/a | |
| Surprise, AZ | 139,007 | 74 | 48.0% |
| Metairie, LA | 138,511 | 45 | 10.0% |
| Olathe, KS | 139,216 | 47 | 6.0% |
| Orange, CA | 139,322 | 89 | 78.0% |
| Roseville, CA | 138,860 | 52 | 4.0% |
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