Rosslyn Farms, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rosslyn Farms, a borough in Allegheny County, Pennsylvania.
This Afternoon
78°F
Sunny
Sunny, with a high near 78. South wind around 3 mph.
7-day forecast for Rosslyn Farms
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 3 mph S | 1% |
| Tonight | 54°F | Mostly Clear | 2 to 6 mph SE | 2% |
| Wednesday | 77°F | Mostly Cloudy | 5 to 10 mph SE | 8% |
| Wednesday Night | 61°F | Light Rain | 12 mph S | 100% |
| Thursday | 70°F | Chance Light Rain then Mostly Sunny | 7 to 14 mph SW | 25% |
| Thursday Night | 49°F | Partly Cloudy | 1 to 6 mph SW | 3% |
| Friday | 65°F | Partly Sunny | 1 to 7 mph W | 10% |
| Friday Night | 45°F | Slight Chance Light Rain | 6 mph NW | 24% |
| Saturday | 56°F | Chance Light Rain | 6 to 12 mph W | 28% |
| Saturday Night | 39°F | Chance Light Rain then Mostly Cloudy | 3 to 8 mph W | 26% |
| Sunday | 55°F | Partly Sunny then Slight Chance Light Rain | 5 to 10 mph W | 15% |
| Sunday Night | 38°F | Slight Chance Light Rain | 9 mph W | 18% |
| Monday | 56°F | Chance Light Rain | 9 to 14 mph W | 27% |
| Monday Night | 39°F | Chance Light Rain then Partly Cloudy | 8 to 12 mph SW | 27% |
Forecast source: National Weather Service (api.weather.gov) for Rosslyn Farms (40.422, -80.089). Updated through the day.
Growing snapshot for Rosslyn Farms
Last spring frost
Apr 24
First fall frost
Oct 27
Growing season
186 days
Hardiness zone
6b
More local growing data for Rosslyn Farms: nearby ZIP 15205 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Emsworth L/D Ohio Rvr, Pa (4.7 mi from Rosslyn Farms). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.