| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 60°F | 47°F | 3.6" |
| February | 40°F | 64°F | 51°F | 3.4" |
| March | 43°F | 68°F | 55°F | 2.5" |
| April | 46°F | 75°F | 60°F | 1.5" |
| May | 54°F | 85°F | 69°F | 0.8" |
| June | 61°F | 94°F | 78°F | 0.5" |
| July | 66°F | 101°F | 83°F | 0.1" |
| August | 63°F | 99°F | 81°F | 0.0" |
| September | 58°F | 94°F | 75°F | 0.4" |
| October | 50°F | 81°F | 64°F | 1.2" |
| November | 42°F | 67°F | 53°F | 2.5" |
| December | 36°F | 58°F | 46°F | 3.9" |
| Index | Richfield | California | National |
| Air quality index | 41 | 55 | 42 |
| Pollution index | 1,812,230 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 282 |
| Days with moderate air quality | 83 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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. |
| Rancho Tehama Reserve, CA | 1,750 | 41 | 18.0% |
| Los Molinos, CA | 1,924 | 41 | 18.0% |
| Red Bluff, CA | 14,091 | 41 | 18.0% |
| Corning, CA | 7,589 | 41 | 18.0% |
| Proberta, CA | 36 | 41 | 18.0% |
| Richfield, CA | 341 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Midland, AR | 341 | 36 | 28.0% |
| Shirley, AR | 341 | 36 | 28.0% |
| Edmundson Acres, CA | 341 | 67 | 34.0% |
| Mad River, CA | 341 | 27 | 46.0% |
| Duncombe, IA | 341 | 37 | 26.0% |
| Richfield, CA | 341 | 41 | 18.0% |
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