| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 57°F | 47°F | 10.1" |
| February | 41°F | 62°F | 51°F | 8.0" |
| March | 44°F | 67°F | 55°F | 8.4" |
| April | 46°F | 74°F | 59°F | 4.6" |
| May | 53°F | 83°F | 68°F | 2.6" |
| June | 58°F | 91°F | 75°F | 2.6" |
| July | 62°F | 96°F | 79°F | 0.2" |
| August | 60°F | 95°F | 77°F | 0.4" |
| September | 57°F | 90°F | 73°F | 1.3" |
| October | 50°F | 79°F | 63°F | 4.8" |
| November | 43°F | 65°F | 53°F | 7.5" |
| December | 37°F | 56°F | 46°F | 9.8" |
| Index | Wheatland | 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. |
| Smartsville, CA | 487 | 44 | 12.0% |
| Olivehurst, CA | 15,149 | 44 | 12.0% |
| Sheridan, CA | 1,120 | 44 | 12.0% |
| Yuba City, CA | 66,660 | 44 | 12.0% |
| Plumas Lake, CA | 7,687 | 44 | 12.0% |
| Wheatland, CA | 3,631 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Thompsonville, PA | 3,631 | 56 | 12.0% |
| Key Center, WA | 3,631 | 18 | 64.0% |
| Barnegat, NJ | 3,630 | 37 | 26.0% |
| Horicon, WI | 3,630 | 40 | 20.0% |
| Frackville, PA | 3,632 | 42 | 16.0% |
| Wheatland, CA | 3,631 | 44 | 12.0% |
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