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Caln, PA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Caln, a community in Chester County, Pennsylvania.

Today
74°F
Mostly Sunny
Mostly sunny, with a high near 74. East wind around 5 mph.

7-day forecast for Caln

WhenTempForecastWindPrecip
Today 74°F Mostly Sunny 5 mph E 2%
Tonight 59°F Mostly Cloudy then Slight Chance Rain Showers 5 mph SE 17%
Sunday 74°F Chance Rain Showers 5 to 10 mph S 53%
Sunday Night 56°F Showers And Thunderstorms 5 to 10 mph NW 79%
Monday 67°F Chance Rain Showers 5 to 10 mph NE 28%
Monday Night 50°F Chance Rain Showers 5 to 10 mph NE 39%
Tuesday 60°F Chance Rain Showers 10 mph NE 44%
Tuesday Night 49°F Chance Rain Showers 10 to 15 mph NE 40%
Wednesday 60°F Chance Rain Showers 15 mph NE 35%
Wednesday Night 49°F Chance Rain Showers 10 to 15 mph NE 33%
Thursday 60°F Chance Rain Showers 10 to 15 mph NE 33%
Thursday Night 48°F Chance Rain Showers 5 to 10 mph NE 30%
Friday 63°F Slight Chance Rain Showers 10 mph N 23%
Friday Night 49°F Slight Chance Rain Showers 5 to 10 mph N 23%

Forecast source: National Weather Service (api.weather.gov) for Caln (39.997, -75.783). Updated through the day.

Growing snapshot for Caln

Last spring frost
Apr 19
First fall frost
Oct 25
Growing season
190 days
Hardiness zone
7a

More local growing data for Caln: nearby ZIP 19372 weather · frost dates · planting calendar · Pennsylvania frost dates

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Climate data from the nearest NOAA station, Coatesville 2 W, Pa (5.5 mi from Caln). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.