Jefferson, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jefferson, a borough in Greene County, Pennsylvania.
Overnight
53°F
Mostly Clear
Mostly clear, with a low around 53. South wind 0 to 3 mph.
7-day forecast for Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Clear | 0 to 3 mph S | 1% |
| Wednesday | 77°F | Mostly Cloudy then Slight Chance Light Rain | 2 to 9 mph S | 23% |
| Wednesday Night | 60°F | Light Rain | 10 mph S | 98% |
| Thursday | 70°F | Chance Light Rain then Partly Sunny | 7 to 13 mph SW | 40% |
| Thursday Night | 47°F | Partly Cloudy | 2 to 6 mph SW | 2% |
| Friday | 64°F | Partly Sunny then Slight Chance Light Rain | 2 to 8 mph SW | 17% |
| Friday Night | 40°F | Chance Light Rain | 2 to 7 mph W | 33% |
| Saturday | 56°F | Chance Light Rain | 6 to 10 mph W | 33% |
| Saturday Night | 36°F | Chance Light Rain then Partly Cloudy | 2 to 7 mph W | 26% |
| Sunday | 56°F | Partly Sunny then Slight Chance Light Rain | 3 to 10 mph SW | 15% |
| Sunday Night | 34°F | Slight Chance Light Rain | 8 mph SW | 24% |
| Monday | 56°F | Chance Light Rain | 8 to 14 mph W | 28% |
| Monday Night | 35°F | Chance Light Rain then Partly Cloudy | 8 to 12 mph SW | 28% |
| Tuesday | 60°F | Mostly Sunny | 12 to 16 mph SW | 9% |
Forecast source: National Weather Service (api.weather.gov) for Jefferson (39.930, -80.058). Updated through the day.
Growing snapshot for Jefferson
Last spring frost
May 3
First fall frost
Oct 15
Growing season
164 days
Hardiness zone
6b
More local growing data for Jefferson: nearby ZIP 15344 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Bobtown
Carmichaels
Clarksville
Crucible
Dry Tavern
Fairdale
Mapletown
Mather
Morrisville
Mount Morris
Nemacolin
New Freeport
Rices Landing
Rogersville
Waynesburg
West Waynesburg
Wind Ridge
Climate data from the nearest NOAA station, Waynesburg 1 E, Pa (6.3 mi from Jefferson). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.