Winter in Boise means inversions, and inversions mean the valley air stops moving and holds everything in it. Fine particulate settles onto glass over weeks of stagnant cold, which is why windows can look filthy in January without a single storm having passed through.
During an inversion, a layer of warm air caps the valley and traps colder air, dust, and combustion particulate underneath it. That material settles slowly onto every horizontal and vertical surface, including windows. It is not splash and it is not rain, it is accumulation, and it builds through the stretch of the winter when the air is most still.
With houses closed up and heating running, interior surfaces collect a film from cooking, dust, and woodstove or fireplace use. Interior window cleaning is genuinely a winter service rather than a compromise, because it is unaffected by outdoor temperature and it is the side of the glass people actually look through all season.
Cinders and magnesium chloride from treated roads get thrown onto the lower few feet of anything near a street. On glass it is easy to remove. On siding it is worth attending to before spring, since the residue holds moisture against the surface through the wet months.
Exterior water work below freezing is not sensible and is not offered on those days. Water freezes in the tracks and on the pane, sills can be damaged, and ladder work on ice is a safety problem. If a week is too cold, we say so and reschedule rather than doing the job badly.
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Inversions trap particulate in the valley and it settles gradually onto glass. It is accumulation from still air, not weather.
Interior work, yes, any time. Exterior work depends on temperature; we do not run water on glass in a hard freeze.
In winter it is often the more useful of the two, since houses are closed up and the film that builds indoors is on the side you look through.
It does not damage the glass, and it comes off easily. The bigger concern is residue sitting on siding and trim through the wet season.
Not necessarily. Spring brings cottonwood and pollen, so a late-winter interior clean plus an exterior clean after the pollen passes is usually the better sequence.
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