Franklin County's seat
The Borough describes Chambersburg as located in Franklin County, the County Seat and a full-service municipality. That's the setting for this page. What follows is about one practical question for anyone planning to paint the outside of a house here: how many days of the year are simply too cold for the paint on the label?
Two freezing counts from one station
NOAA's climate normals for the Chambersburg 1 ESE station average 108.8 days a year with a low of 32°F or colder. The same station averages 20.7 days a year when the high temperature stays at 32°F or below. Both figures come from the 1991-2020 normals for that station; they describe the station's record, not a reading taken at your house.
The two numbers mean different things for a painter.
- A freezing night is the more common of the two. The air may warm well above freezing by afternoon, but siding, trim and railings that went through the night at or below freezing can stay cold, and often wet with frost or dew, well into the morning.
- A day that never thaws rules out exterior painting. Every exterior paint label sets a minimum application temperature, and a day that stays at or below freezing sits under the minimum most products list.
Why the morning matters more than the afternoon
Paint labels give a minimum temperature for the air and the surface, and many also say the temperature must stay above that minimum for a stretch of hours after application. On a day that follows a freezing night, the afternoon reading on your phone isn't the number that counts. The question is whether the boards were dry and warm enough when the brush touched them, and whether they will stay that way until the coat has set.
A careful crew handles this by:
- starting on the walls that get sun first and leaving shaded walls for later in the day;
- feeling and, if needed, measuring the surface rather than trusting the air temperature;
- stopping early enough that dew doesn't settle on soft paint at dusk;
- skipping a day rather than pushing on when the forecast low drops near freezing that night.
If a painter tells you they won't start the north side until afternoon, or wants to wait for a better week, that's a sign they're reading the label.
What frost does to old paint
Water that gets behind paint through a cracked joint or a gap at a window head can freeze and thaw again and again over the cold months. Each cycle pushes the film away from the wood a little more. That's why the scraping and caulking described on our exterior painting page count for so much: closing the gaps keeps water out of the places where freezing can work on it.
When a painter walks the house, ask them to point out where the paint is lifting and whether they think water is getting behind it. A failure that keeps coming back in the same spot usually has a cause that paint alone won't fix.
Moving the job inside
Cold weather is a reason to plan, not to stop. Interior rooms, cabinets, stairwells and ceilings can be painted any month the house is heated, as long as there's enough fresh air for the product being used. Many homeowners schedule the exterior for the warmer stretch of the year and book interior work for the months when freezing nights pile up. Our interior painting page walks through what a good interior job includes.
Registration under Pennsylvania law
Pennsylvania's Office of Attorney General notes that the Home Improvement Consumer Protection Act's list of home improvements includes painting, and that contractors above the yearly threshold in the fact card below must register with that office. You can ask a painter whether they're registered under the Act. We don't check registrations for you.
Questions for a Chambersburg exterior bid
- What's the lowest air and surface temperature the products you'll use allow?
- On a morning after a freezing night, when do you start, and on which side?
- How long does each coat need above that minimum before it's safe from dew?
- Which loose or lifting areas will you scrape, and what will you caulk?
- If the weather turns, will you finish the exterior later or move to inside work?