| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 56°F | 46°F | 6.8" |
| February | 40°F | 57°F | 47°F | 6.2" |
| March | 41°F | 57°F | 48°F | 8.0" |
| April | 42°F | 58°F | 49°F | 4.5" |
| May | 45°F | 60°F | 52°F | 1.8" |
| June | 48°F | 62°F | 55°F | 1.4" |
| July | 51°F | 63°F | 56°F | 0.3" |
| August | 51°F | 64°F | 56°F | 0.2" |
| September | 48°F | 65°F | 55°F | 1.1" |
| October | 46°F | 64°F | 53°F | 3.8" |
| November | 43°F | 59°F | 50°F | 6.1" |
| December | 39°F | 55°F | 46°F | 8.8" |
| Index | McKinleyville | California | National |
| Air quality index | 27 | 55 | 42 |
| Pollution index | 5,642,310 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 353 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.050% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Arcata, CA | 18,266 | 27 | 46.0% |
| Eureka, CA | 26,938 | 27 | 46.0% |
| Myrtletown, CA | 5,143 | 27 | 46.0% |
| Bayview, CA | 2,787 | 27 | 46.0% |
| Bayview CDP (Contra Costa County), CA | 1,753 | 27 | 46.0% |
| McKinleyville, CA | 16,645 | 27 | 46.0% |
| City | Population | Air Quality Index | National Avg. |
| Madison, NJ | 16,647 | 51 | 2.0% |
| Ham Lake, MN | 16,630 | 46 | 8.0% |
| Sikeston, MO | 16,664 | 44 | 12.0% |
| Truckee, CA | 16,666 | 44 | 12.0% |
| Waterville, ME | 16,623 | 28 | 44.0% |
| McKinleyville, CA | 16,645 | 27 | 46.0% |
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