Caln, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Caln, a community in Chester County, Pennsylvania.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Northeast wind 0 to 5 mph.
7-day forecast for Caln
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Tonight | 65°F | Mostly Cloudy | 0 mph | 9% |
| Wednesday | 82°F | Showers And Thunderstorms Likely | 0 to 5 mph E | 73% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 5 mph S | 46% |
| Thursday | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 34% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 42% |
| Friday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 49% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 49% |
| Saturday | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 41% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 41% |
| Sunday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 15% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 15% |
| Monday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph W | 18% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 5 mph W | 18% |
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 Aug 4, 2026.