Right now, if you step outside in Chambersburg, you’re feeling that biting 29°F air. Honestly, it feels way colder—more like 21°F—thanks to a steady north wind at 7 mph. It’s gray, it's cloudy, and there’s that persistent 10% chance of snow flurries just hanging over Franklin County like it's waiting for an invitation.
People always talk about the "snow hole" here, but the Chambersburg weather 10 day forecast is finally looking like it might break that tradition.
The immediate deep freeze
Sunday is basically a wash if you were hoping for sun. We’re topping out at 32°F with heavy cloud cover. Tonight, things get a bit more serious as the thermometer drops to 19°F. While it'll be partly cloudy, there’s a slight bump in the snow chance to 20%. Don't expect to wake up to a winter wonderland just yet, but the air is definitely primed.
Monday, January 19, keeps that ceiling at 32°F. It’ll be partly sunny, but the wind is the real story here. We're looking at southwest gusts hitting 18 mph. That’s going to make the "real feel" stay in the basement. When the sun goes down, it’s going to bottom out at a bone-chilling 11°F.
Tuesday is the day you’ll want to double-layer. The high is only 21°F. Pure sun, sure, but with a low of 11°F again, that sunshine is basically cosmetic.
Mid-week "warm-up" and the snow signal
By Wednesday, the wind shifts south at 17 mph, pushing us up to 36°F. It’s not exactly tropical, but compared to Tuesday, it’ll feel like a gift. Mostly cloudy skies return, and we hold that mid-30s range into Thursday with a high of 37°F.
Then things get interesting.
The Chambersburg weather 10 day forecast shows a significant pattern shift as we head into the following weekend. Friday and Saturday (Jan 23-24) stay chilly, hovering around 31°F and 29°F. But Sunday, January 25, is when the models start getting aggressive.
We’re tracking a potential snow event.
Sunday’s high drops back to 19°F. We’re looking at snow showers during the day and a 45% chance of steady snow overnight. Monday, January 26, currently shows a 75% chance of snow with a high of only 22°F. Unlike the "dusting" we've seen lately, this looks like a setup for actual accumulation as a coastal system interacts with the arctic air sitting over the Appalachians.
Why the forecast keeps changing
If you’ve lived in the Cumberland Valley long enough, you know South Mountain and North Mountain play games with the local radar. Cold air often gets "trapped" here—a phenomenon called cold air damming. This is why the Chambersburg weather 10 day forecast can show rain for Hagerstown but keep us in the snow or sleet category for hours longer.
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- Sunday, Jan 18: Cloudy, High 32°F, Low 19°F.
- Monday, Jan 19: Windy/Partly Sunny, High 32°F, Low 11°F.
- Tuesday, Jan 20: Sunny/Frigid, High 21°F, Low 11°F.
- Wednesday, Jan 21: Mostly Cloudy, High 36°F, Low 13°F.
- Thursday, Jan 22: Partly Sunny, High 37°F, Low 20°F.
- Friday, Jan 23: Mostly Cloudy, High 31°F, Low 14°F.
- Saturday, Jan 24: Partly Sunny, High 29°F, Low 14°F.
- Sunday, Jan 25: Snow Showers, High 19°F, Low 12°F.
- Monday, Jan 26: Snow Likely, High 22°F, Low 12°F.
- Tuesday, Jan 27: Partly Sunny, High 21°F, Low 9°F.
Real-world impact for Franklin County
This isn't just about numbers on a screen. With lows hitting 9°F and 11°F multiple times this week, plumbing is at risk.
Local experts often point out that our typical January high is closer to 37°F, so we are running significantly below average for most of this window. The Monday/Tuesday (Jan 26-27) period looks especially brutal. If that snow hits on Monday with a high of 22°F, it’s going to stick instantly. No melting on the roads during the "heat" of the day.
Basically, the 10-day outlook is a reminder that winter has finally found its teeth in PA.
Keep your tanks half-full to prevent fuel line freeze-ups during those 11-degree nights. If you’re commuting on I-81 or Route 30, keep an eye on that Sunday/Monday window—it’s the most likely time for travel headaches in the current model run.
Check your outdoor spigots today before the overnight lows stay consistently below freezing for the next 48 hours.