| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 60°F | 47°F | 5.6" |
| February | 41°F | 64°F | 52°F | 4.8" |
| March | 45°F | 69°F | 56°F | 4.6" |
| April | 47°F | 74°F | 60°F | 2.5" |
| May | 52°F | 82°F | 67°F | 0.7" |
| June | 57°F | 91°F | 74°F | 0.3" |
| July | 60°F | 96°F | 77°F | 0.0" |
| August | 59°F | 95°F | 75°F | 0.0" |
| September | 56°F | 92°F | 73°F | 0.1" |
| October | 50°F | 81°F | 64°F | 1.9" |
| November | 43°F | 68°F | 54°F | 2.3" |
| December | 37°F | 59°F | 47°F | 4.6" |
| Index | Madison | California | National |
| Air quality index | 52 | 55 | 50 |
| Pollution index | 3,319,120 | 18,106,726 | 5,066,862 |
| 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 | 0.100% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.070% |
| Mercury | 0.120% |
| City, State | Population | Air Quality Index | National Avg. |
| Guinda, CA | 255 | 31 | 38% |
| Esparto, CA | 3,618 | 35 | 30% |
| Winters, CA | 6,974 | 35 | 30% |
| Robbins, CA | 322 | 44 | 12% |
| Woodland, CA | 57,552 | 52 | 4% |
| Madison, CA | 609 | 52 | 4% |
| City, State | Population | Air Quality Index | National Avg. |
| Haring, MI | 609 | 36 | 28% |
| Coalville, IA | 609 | 37 | 26% |
| Castlewood, SD | 609 | 25 | 50% |
| Scotland, TX | 609 | 26 | 48% |
| Evansville, MN | 609 | 29 | 42% |
| Madison, CA | 609 | 52 | 4% |
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