Frost Dates for Greenisland, United Kingdom

Based on data from Stormont Castle weather station, 7 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. March 24
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. November 24
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly 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 April 6
First Fall Frost November 14

Hard Freeze (−2°C)

Last Spring Hard Freeze February 12
First Fall Hard Freeze December 20
54.70°N, -5.87°W © OpenStreetMap

Growing Season

245 Days March 24 to November 24

USDA Hardiness Zone iHardiness 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: 25 to 30°F (−4 to −1°C)

Learn more

Köppen Climate iThe 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

0° 5° 10° 15° 20°
5°
High: 8°C
Avg: 5°C
Low: 3°C
Jan
6°
High: 9°C
Avg: 6°C
Low: 3°C
Feb
7°
High: 10°C
Avg: 7°C
Low: 3°C
Mar
9°
High: 13°C
Avg: 9°C
Low: 5°C
Apr
11°
High: 15°C
Avg: 11°C
Low: 7°C
May
14°
High: 18°C
Avg: 14°C
Low: 10°C
Jun
16°
High: 19°C
Avg: 16°C
Low: 12°C
Jul
15°
High: 19°C
Avg: 15°C
Low: 12°C
Aug
13°
High: 17°C
Avg: 13°C
Low: 10°C
Sep
11°
High: 14°C
Avg: 11°C
Low: 8°C
Oct
8°
High: 10°C
Avg: 8°C
Low: 5°C
Nov
6°
High: 8°C
Avg: 6°C
Low: 3°C
Dec
Avg High Avg Temp Avg Low

Precipitation

0 mm 50 mm 100 mm
91 mm
91.4 mm
Jan
76 mm
76.2 mm
Feb
84 mm
83.8 mm
Mar
66 mm
66.0 mm
Apr
71 mm
71.1 mm
May
79 mm
78.7 mm
Jun
79 mm
78.7 mm
Jul
86 mm
86.4 mm
Aug
76 mm
76.2 mm
Sep
97 mm
96.5 mm
Oct
107 mm
106.7 mm
Nov
99 mm
99.1 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec7.5h9.5h11.5h14h16h17h16.5h14.5h12.5h10h8h7h
Jan: 8:13 AM – 3:47 PM · 7h 34m
Feb: 7:18 AM – 4:42 PM · 9h 25m
Mar: 6:16 AM – 5:44 PM · 11h 28m
Apr: 5:06 AM – 6:54 PM · 13h 48m
May: 4:06 AM – 7:54 PM · 15h 49m
Jun: 3:31 AM – 8:29 PM · 16h 59m
Jul: 3:45 AM – 8:15 PM · 16h 30m
Aug: 4:39 AM – 7:21 PM · 14h 42m
Sep: 5:48 AM – 6:12 PM · 12h 25m
Oct: 6:55 AM – 5:05 PM · 10h 10m
Nov: 7:57 AM – 4:03 PM · 8h 06m
Dec: 8:30 AM – 3:30 PM · 7h 01m
Daylight Longest: 17h 01m · Shortest: 6h 59m

Nearby Stations

Hillsborough, United Kingdom April 19 - November 10 Aldergrove, United Kingdom April 14 - November 8 Armagh, United Kingdom April 13 - November 9 Ronaldsway, United Kingdom March 11 - November 28 Glenlee, United Kingdom May 12 - October 8 Auchincruive, United Kingdom April 28 - October 26

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