Frost Dates for HOPEN, Norway
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.
June 24
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.
August 14
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
June 29
First Fall Frost
July 24
Hard Freeze (−2°C)
Last Spring Hard Freeze
May 29
First Fall Hard Freeze
October 11
Growing Season
51 Days
June 24 to August 14
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 5b
Avg. annual minimum: −26 to −23°C
Köppen Climate
The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
ET
Tundra
No true summer — the warmest month averages below 10°C (50°F). Growing is limited to hardy greens, root crops, and cold-frames during the brief warm period. Permafrost restricts root depth.
Temperature
-15°
-10°
-5°
0°
5°
Avg High
Avg Temp
Avg Low
Light Frost (0°C)
Hard Frost (−2°C)
Temperature table
| Month | Avg High | Avg Temp | Avg Low |
|---|---|---|---|
| January | -7° | -8° | -10° |
| February | -7° | -9° | -11° |
| March | -8° | -10° | -12° |
| April | -6° | -8° | -10° |
| May | -2° | -3° | -4° |
| June | 1° | 1° | 0° |
| July | 3° | 3° | 2° |
| August | 4° | 3° | 3° |
| September | 3° | 2° | 2° |
| October | 0° | -1° | -2° |
| November | -2° | -4° | -5° |
| December | -5° | -7° | -8° |
Precipitation
0 mm
20 mm
40 mm
60 mm
Precipitation table
| Month | Precipitation |
|---|---|
| January | 33 |
| February | 15 |
| March | 20 |
| April | 15 |
| May | 8 |
| June | 8 |
| July | 20 |
| August | 18 |
| September | 38 |
| October | 48 |
| November | 56 |
| December | 41 |
Sunrise / Sunset
Daylight
Longest: 24h 00m · Shortest: 0h 00m
Sunrise and sunset table
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | – | – | 0h (polar night) |
| February | 11:19 AM | 12:41 PM | 1h 23m |
| March | 6:47 AM | 5:13 PM | 10h 25m |
| April | 3:05 AM | 8:55 PM | 17h 49m |
| May | – | – | 24h (midnight sun) |
| June | – | – | 24h (midnight sun) |
| July | – | – | 24h (midnight sun) |
| August | – | – | 24h (midnight sun) |
| September | 5:23 AM | 6:37 PM | 13h 14m |
| October | 8:59 AM | 3:01 PM | 6h 02m |
| November | – | – | 0h (polar night) |
| December | – | – | 0h (polar night) |
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