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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 60°F | 46°F | 6.0" |
| February | 39°F | 64°F | 50°F | 5.7" |
| March | 41°F | 67°F | 52°F | 4.6" |
| April | 43°F | 71°F | 55°F | 2.4" |
| May | 46°F | 77°F | 60°F | 1.1" |
| June | 50°F | 83°F | 64°F | 0.4" |
| July | 52°F | 85°F | 65°F | 0.0" |
| August | 52°F | 84°F | 64°F | 0.0" |
| September | 49°F | 85°F | 64°F | 0.2" |
| October | 46°F | 78°F | 59°F | 2.0" |
| November | 41°F | 67°F | 52°F | 3.2" |
| December | 36°F | 59°F | 46°F | 6.9" |
| Index | Healdsburg | California | National |
| Air quality index | 34 | 55 | 42 |
| Pollution index | 360,238 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 346 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Middletown, CA | 740 | 31 | 38.0% |
| Cobb, CA | 833 | 31 | 38.0% |
| Cloverdale, CA | 9,179 | 31 | 38.0% |
| Forestville, CA | 3,882 | 34 | 32.0% |
| Jenner, CA | 33 | 34 | 32.0% |
| Healdsburg, CA | 12,288 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Gold Canyon, AZ | 12,284 | 74 | 48.0% |
| Pennsville, NJ | 12,293 | 40 | 20.0% |
| Port Washington, WI | 12,294 | 44 | 12.0% |
| Port Lavaca, TX | 12,295 | 31 | 38.0% |
| Eufaula, AL | 12,279 | 42 | 16.0% |
| Healdsburg, CA | 12,288 | 34 | 32.0% |
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