| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 3.5" |
| February | 42°F | 62°F | 51°F | 3.9" |
| March | 45°F | 67°F | 56°F | 3.7" |
| April | 48°F | 74°F | 60°F | 2.1" |
| May | 55°F | 84°F | 69°F | 0.7" |
| June | 61°F | 92°F | 76°F | 0.3" |
| July | 65°F | 98°F | 81°F | 0.0" |
| August | 63°F | 95°F | 79°F | 0.0" |
| September | 59°F | 90°F | 74°F | 0.2" |
| October | 51°F | 79°F | 64°F | 1.2" |
| November | 44°F | 65°F | 54°F | 2.6" |
| December | 38°F | 57°F | 47°F | 4.1" |
| Index | Chico | California | National |
| Air quality index | 46 | 55 | 42 |
| Pollution index | 1,812,230 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 224 |
| Days with moderate air quality | 136 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Cohasset, CA | 497 | 46 | 8.0% |
| Durham, CA | 6,255 | 46 | 8.0% |
| Vina, CA | 212 | 46 | 8.0% |
| Forest Ranch, CA | 1,551 | 46 | 8.0% |
| Paradise, CA | 17,560 | 46 | 8.0% |
| Chico, CA | 98,683 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Boca Raton, FL | 98,776 | 41 | 18.0% |
| Beaverton, OR | 98,567 | 38 | 24.0% |
| Lee's Summit, MO | 98,997 | 47 | 6.0% |
| Saint-Jean-sur-Richelieu, QC | 99,027 | n/a | |
| Roanoke, VA | 99,122 | 38 | 24.0% |
| Chico, CA | 98,683 | 46 | 8.0% |
Here are the best places to live in California
These are the 10 cheapest cities in California
Check out the 10 safest cities in California
Most Dangerous Cities In The US