Local Conditions
Drying a Rug in Raleigh Air
143 days a year at or above 75% relative humidity, 96 of them at or above 80%, arriving mostly in spring and fall: Raleigh has two damp seasons with a hot dry middle and a cold dry end. Drying a rug is easy in two of those and slow in the other two.
69.7%
Mean relative humidity, five-year average
96
Days a year at or above 80% relative humidity
24
Longest unbroken damp run, in days
113
Days a year with measurable rain
Rain, and the trip to the workshop
113 days a year here see measurable rain, totalling 47.9 inches, so a rug leaving the house is wrapped for the weather rather than for the look of it.
It is also why we would rather collect a wet rug than have it wait: a rug that is already damp when it is rolled is in the worst possible condition for sitting still.
Why it cannot dry where it lies
A rug washed in the room it lives in has to give its water back to that room's air, and for 24 days at a stretch Raleigh air is already at or above 75%.
Air that damp takes water out of a rug slowly at best, which is the whole problem with in-home wand cleaning here: the pile dries, the foundation does not, and the rug smells fine for a few weeks and then does not.
Odor that comes back every damp week
Mean relative humidity of 69.7%, with the daily maximum reaching 95% on 45.6% of days, is enough to reactivate anything left in a foundation.
A smell that returns on the damp weeks and fades on the dry ones is not a cleaning that wore off; it is a source still in the rug or under it, and it is worth saying which before the rug is washed again.
The floor the rug goes back onto
Where the housing runs to crawlspaces — Hayes Barton, Cary and Apex among them — a rug that has been rewetted from below will smell again within a week of coming home if the crawlspace is not addressed too.
That is not a cleaning failure. The wash removes what is in the rug; it cannot remove what is under the floor, and we would rather say so before collection than after delivery.
Much of North Hills, Trinity Park and Morrisville is condominium stock, where the rug usually has to come out through a corridor and a service elevator rather than a front door.
Rolling a rug for that trip is fine dry and a bad idea wet, which is one of several reasons the wash does not happen in the building.
Housing on this route starts in the 1850s, so a fair number of these rugs are drying onto floors that are older than any vapor barrier — a detail worth settling before the rug comes back.
Humidity, rainfall and temperature figures are from the ERA5 reanalysis record for the five
years from 2021 through 2025, measured at the center of the the Triangle service area.