Caln, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Caln, a community in Chester County, Pennsylvania.
Tonight
56°F
Partly Cloudy
Partly cloudy, with a low around 56. North wind around 5 mph.
7-day forecast for Caln
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 72°F | Mostly Sunny | 5 to 10 mph NE | 2% |
| Saturday Night | 61°F | Mostly Cloudy then Patchy Fog | 5 mph SE | 27% |
| Sunday | 75°F | Showers And Thunderstorms | 5 to 10 mph S | 82% |
| Sunday Night | 60°F | Showers And Thunderstorms | 5 to 10 mph NW | 83% |
| Monday | 68°F | Chance Rain Showers | 5 to 10 mph NE | 40% |
| Monday Night | 55°F | Chance Rain Showers | 5 to 10 mph NE | 33% |
| Tuesday | 61°F | Chance Rain Showers | 10 mph NE | 41% |
| Tuesday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 41% |
| Wednesday | 59°F | Chance Rain Showers | 10 to 15 mph NE | 39% |
| Wednesday Night | 51°F | Chance Showers And Thunderstorms | 10 mph NE | 40% |
| Thursday | 61°F | Chance Showers And Thunderstorms | 10 mph NE | 38% |
| Thursday Night | 51°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 33% |
| Friday | 66°F | Chance Rain Showers | 5 to 10 mph N | 28% |
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
Nearby towns & communities
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Elverson
Exton
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Glenmoore
Hamorton
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Honey Brook
Kennett Square
Kimberton
Lincoln University
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Malvern
Marshallton
Modena
Nottingham
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Paoli
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.