Frost Dates for HELSINKI HARMAJA, Finland

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. April 27
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. October 19

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 May 2
First Fall Frost October 13

Hard Freeze (−2°C)

Last Spring Hard Freeze April 16
First Fall Hard Freeze November 4
60.10°N, 24.98°E © OpenStreetMap

Growing Season

175 Days April 27 to October 19

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 6b

Avg. annual minimum: −21 to −18°C

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)
Temperature table
Average monthly temperatures (°C)
Month Avg High Avg Temp Avg Low
January-2°-4°-6°
February-3°-5°-7°
March1°-2°-5°
April7°4°0°
May13°10°6°
June18°14°11°
July21°18°14°
August20°17°14°
September15°12°10°
October8°6°4°
November3°2°0°
December0°-1°-3°

Precipitation

Precipitation table
Average monthly precipitation (millimeters)
MonthPrecipitation
January56
February43
March30
April33
May43
June74
July81
August79
September64
October74
November71
December69

Sunrise / Sunset

Daylight Longest: 18h 32m · Shortest: 5h 28m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January8:50 AM3:10 PM6h 19m
February7:37 AM4:23 PM8h 46m
March6:20 AM5:40 PM11h 21m
April4:53 AM7:07 PM14h 14m
May3:35 AM8:25 PM16h 50m
June2:46 AM9:14 PM18h 28m
July3:07 AM8:53 PM17h 46m
August4:19 AM7:41 PM15h 22m
September5:45 AM6:15 PM12h 31m
October7:08 AM4:52 PM9h 43m
November8:29 AM3:31 PM7h 03m
December9:14 AM2:46 PM5h 31m

Nearby Stations

HELSINKI ISOSAARI, Finland April 24 - October 24 HELSINKI KAISANIEMI AWS, Finland April 28 - October 19 HELSINKI RAUTATIENTORI, Finland April 27 - October 20 HELSINKI KUMPULA, Finland April 28 - October 18 HELSINKI ILMALA, Finland April 28 - October 19 HELSINKI-MALMIN LENTOASEMA, Finland April 30 - October 16

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