| 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 | Dunnigan | California | National |
| Air quality index | 44 | 55 | 42 |
| Pollution index | 3,319,120 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 239 |
| Days with moderate air quality | 124 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.100% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.070% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Guinda, CA | 113 | 31 | 38.0% |
| Esparto, CA | 4,009 | 35 | 30.0% |
| Grimes, CA | 462 | 44 | 12.0% |
| Robbins, CA | 428 | 44 | 12.0% |
| College City, CA | 205 | 44 | 12.0% |
| Dunnigan, CA | 1,391 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Hagan, GA | 1,391 | 39 | 22.0% |
| Woodbine, IA | 1,391 | 40 | 20.0% |
| Owensville, IN | 1,391 | 45 | 10.0% |
| Humansville, MO | 1,391 | 39 | 22.0% |
| Miamitown, OH | 1,391 | 54 | 8.0% |
| Dunnigan, CA | 1,391 | 44 | 12.0% |
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