There's more fog in autumn because of...
* Longer nights, allowing more time for the air to cool to saturation (the dew point)
* Relatively clear skies, since the storm season has not arrived yet. Clear skies allows infrared radiation to escape, causing more cooling.
* A relatively stable atmosphere, and fog loves stability.
Also, Fox News is dumb.
Also also, my new segment on KPLU starts Friday at 9 AM.