Caln, PA Weather & Growing Conditions

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

This Afternoon

68°F

Mostly Sunny

Mostly sunny, with a high near 68. South wind around 5 mph.

7-day forecast for Caln

When	Temp	Forecast	Wind	Precip
This Afternoon	68°F	Mostly Sunny	5 mph S	2%
Tonight	49°F	Mostly Cloudy	0 to 5 mph S	3%
Wednesday	72°F	Partly Sunny	0 to 10 mph S	2%
Wednesday Night	56°F	Mostly Cloudy	5 mph S	6%
Thursday	70°F	Chance Light Rain	5 to 10 mph S	52%
Thursday Night	59°F	Light Rain Likely	0 to 5 mph SW	69%
Friday	68°F	Light Rain Likely	0 to 5 mph SW	73%
Friday Night	51°F	Light Rain Likely	0 to 5 mph NW	73%
Saturday	64°F	Slight Chance Light Rain	5 to 10 mph NW	17%
Saturday Night	43°F	Slight Chance Light Rain then Partly Cloudy	5 mph NW	15%
Sunday	60°F	Mostly Sunny	5 mph NW	9%
Sunday Night	42°F	Chance Light Rain	0 to 5 mph W	26%
Monday	57°F	Chance Light Rain	5 to 10 mph NW	29%
Monday Night	40°F	Chance Light Rain	5 to 10 mph W	29%

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

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

Nearby towns & communities

Atglen Avondale Berwyn Chadds Ford Chesterbrook Christiana Coatesville Cochranville Devon Downingtown Eagle Eagleview Elverson Exton Frazer Glenmoore Hamorton Hayti Honey Brook Kennett Square Kimberton Lincoln University Lionville Little Britain Malvern Marshallton Modena Nottingham Oxford Paoli

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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 Nov 3, 2026.