| 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 | Folsom | California | National |
| Air quality index | 52 | 55 | 42 |
| Pollution index | 4,289,310 | 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 | 0.050% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Carmichael, CA | 75,642 | 52 | 4.0% |
| Gold River, CA | 7,930 | 52 | 4.0% |
| North Highlands, CA | 48,660 | 52 | 4.0% |
| Rancho Murieta, CA | 5,682 | 52 | 4.0% |
| Loomis, CA | 6,802 | 52 | 4.0% |
| Folsom, CA | 79,584 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Lakewood, CA | 79,676 | 72 | 44.0% |
| Saint-Jérôme, QC | 79,702 | n/a | |
| New Rochelle, NY | 79,367 | 51 | 2.0% |
| Alameda, CA | 79,827 | 40 | 20.0% |
| Pleasanton, CA | 79,975 | 43 | 14.0% |
| Folsom, CA | 79,584 | 52 | 4.0% |
Here are the best places to live in California
Check out the 10 safest cities in California
Top 10 cities in California with the best education system
Top 10 best public schools in Folsom