I believe that winter is associated with dryness because of indoor
heating. When air enters the room from outside, it may have a high
relative humidity, but the actual water content per volume is low
(because air can hold less water at colder temps). Then, as the heater
heats it up, it does not add any water. Since it now has a higher
capacity for water but the same amount of water, the relative humidity
is lower.

On 8/25/07, Howard Winter <HDRW@h2org.demon.co.uk> wrote:
> Bob,
>
> Static sparks...
>
> On Fri, 24 Aug 2007 17:31:43 -0700, Bob Barr wrote:
>
> >...
> > I've heard that these gas station fires happen more frequently in the
> > winter (northern hemisphere winter, that is). First, the relative
> > humidity is low.
>
> For some values of location.  Around these parts, Winter (no relation) is decidedly damp most of the time.  Checking my weather monitor, I find that
> the driest it's been in the past year was 19%RH, just under two weeks ago, and the wettest was 98% on the 27th of Feb.
>
> > Second, since the temperature is also low, you may
> > get into your car while the tank fills.
>
> For some values of location!  :-)  Here you *have* to stand there and hold the nozzle while it fills up, because the latches that you have over there
> aren't allowed.
>
> Cheers,
>
>
> Howard Winter
> St.Albans, England
>
>
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