Frost Dates for Carmarthen, United Kingdom

Based on data from Aberporth weather station, 23 miles away

Elevation: 23 m

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. March 5
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. December 7

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost March 17
First Fall Frost December 1

Hard Freeze (−2°C)

Last Spring Hard Freeze February 10
First Fall Hard Freeze December 18
51.86°N, 4.31°W © OpenStreetMap

Growing Season

277 Days March 5 to December 7

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 9b

Avg. annual minimum: −4 to −1°C

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Cfb Oceanic (Marine West Coast)

Mild year-round with cool summers and wet winters. Excellent for cool-season crops like brassicas, peas, and root vegetables. Extended harvest seasons but summer heat-loving crops may struggle.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low
Temperature table
Average monthly temperatures (°C)
Month Avg High Avg Temp Avg Low
January8°6°3°
February8°6°3°
March10°7°4°
April12°9°6°
May14°11°8°
June17°14°11°
July18°15°13°
August18°15°13°
September17°14°11°
October14°11°9°
November10°8°6°
December8°6°4°

Precipitation

Precipitation table
Average monthly precipitation (millimeters)
MonthPrecipitation
January86
February74
March64
April56
May58
June61
July61
August79
September74
October104
November119
December104

Sunrise / Sunset

Daylight Greenwich Mean Time (GMT) Longest: 16h 31m · Shortest: 7h 29m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Greenwich Mean Time (GMT))
Month Sunrise Sunset Daylight
January8:28 AM4:27 PM7h 60m
February7:44 AM5:22 PM9h 39m
March6:42 AM6:13 PM11h 31m
April6:29 AM8:08 PM13h 39m
May5:31 AM8:58 PM15h 28m
June5:04 AM9:33 PM16h 29m
July5:22 AM9:26 PM16h 04m
August6:09 AM8:36 PM14h 27m
September7:01 AM7:24 PM12h 23m
October7:54 AM6:13 PM10h 19m
November7:50 AM4:17 PM8h 28m
December8:29 AM3:59 PM7h 30m

Nearby Stations

Gogerddan, United Kingdom April 24 - November 7 Alwen, United Kingdom May 13 - October 14 Valley, United Kingdom March 17 - November 29

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