Frost Dates for Llanerchymedd, United Kingdom
Based on data from Valley weather station, 9 miles away
Elevation: 69 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 17
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.
November 29
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 30
First Fall Frost
November 20
Hard Freeze (−2°C)
Last Spring Hard Freeze
February 11
First Fall Hard Freeze
December 12
Growing Season
257 Days
March 17 to November 29
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 9a
Avg. annual minimum: −7 to −4°C
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.
Temperature
0°
5°
10°
15°
20°
Avg High
Avg Temp
Avg Low
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | 8° | 6° | 4° |
| February | 8° | 6° | 4° |
| March | 10° | 7° | 5° |
| April | 12° | 9° | 6° |
| May | 15° | 12° | 9° |
| June | 17° | 14° | 11° |
| July | 19° | 16° | 13° |
| August | 19° | 16° | 13° |
| September | 17° | 14° | 12° |
| October | 14° | 12° | 9° |
| November | 11° | 9° | 7° |
| December | 9° | 7° | 4° |
Precipitation
0 mm
50 mm
100 mm
Precipitation table
| Month | Precipitation |
|---|---|
| January | 76 |
| February | 71 |
| March | 58 |
| April | 64 |
| May | 61 |
| June | 61 |
| July | 61 |
| August | 66 |
| September | 79 |
| October | 99 |
| November | 109 |
| December | 102 |
Sunrise / Sunset
Daylight
Greenwich Mean Time (GMT)
Longest: 16h 44m · Shortest: 7h 16m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 8:33 AM | 4:22 PM | 7h 49m |
| February | 7:46 AM | 5:19 PM | 9h 32m |
| March | 6:43 AM | 6:13 PM | 11h 30m |
| April | 6:27 AM | 8:10 PM | 13h 43m |
| May | 5:26 AM | 9:03 PM | 15h 37m |
| June | 4:57 AM | 9:39 PM | 16h 42m |
| July | 5:16 AM | 9:31 PM | 16h 15m |
| August | 6:06 AM | 8:39 PM | 14h 33m |
| September | 7:01 AM | 7:25 PM | 12h 24m |
| October | 7:56 AM | 6:11 PM | 10h 15m |
| November | 7:54 AM | 4:12 PM | 8h 18m |
| December | 8:35 AM | 3:53 PM | 7h 18m |
Nearby Stations
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