| 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 | 42 |
| Pollution index | 3,319,120 | 10,473,190 | 2,726,193 |
| 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 | Population | Air Quality Index | National Avg. |
| Guinda, CA | 113 | 31 | 38.0% |
| Esparto, CA | 4,009 | 35 | 30.0% |
| Winters, CA | 7,285 | 35 | 30.0% |
| Robbins, CA | 428 | 44 | 12.0% |
| Davis, CA | 68,640 | 52 | 4.0% |
| Madison, CA | 502 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Pomeroy, IA | 502 | 37 | 26.0% |
| Scales Mound, IL | 502 | 29 | 42.0% |
| Rothsay, MN | 502 | 33 | 34.0% |
| Glenaire, MO | 502 | 47 | 6.0% |
| Jane, MO | 502 | 44 | 12.0% |
| Madison, CA | 502 | 52 | 4.0% |
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