Jefferson, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jefferson, a borough in York County, Pennsylvania.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind 1 to 5 mph.
7-day forecast for Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 1 to 5 mph E | 0% |
| Tonight | 65°F | Mostly Cloudy then Patchy Fog | 3 mph SE | 16% |
| Wednesday | 83°F | Patchy Fog | 2 to 6 mph SE | 75% |
| Wednesday Night | 69°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 6 mph S | 73% |
| Thursday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 8 mph S | 51% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 51% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 52% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 52% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 47% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 47% |
| Sunday | 87°F | Mostly Sunny | 1 to 6 mph W | 14% |
| Sunday Night | 70°F | Partly Cloudy | 3 mph SW | 14% |
| Monday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 8 mph W | 20% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 7 mph W | 20% |
Forecast source: National Weather Service (api.weather.gov) for Jefferson (39.812, -76.843). Updated through the day.
Growing snapshot for Jefferson
Last spring frost
Apr 19
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
7a
More local growing data for Jefferson: nearby ZIP 17311 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Cross Roads
Dallastown
Delta
Dillsburg
Dover
East Prospect
East York
Emigsville
Fawn Grove
Felton
Franklintown
Glen Rock
Goldsboro
Grantley
Hallam
Hanover
Jacobus
Lewisberry
Loganville
Manchester
Mount Royal
Mount Wolf
New Freedom
New Market
New Salem
North York
Parkville
Pennville
Pleasureville
Queens Gate
Climate data from the nearest NOAA station, Millers 4 Ne, Md (7.1 mi from Jefferson). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.