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Rule Morning Frost

Levi - Morning Frost - Finnish Lapland

Sirkka, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

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Here’s what usually blocks matches

No Morning Frost opportunities in the next 14 days

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Rule requirements (key thresholds)
Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Wind Speed · ≤ 1.5m/s

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Frost Probability 100% failing
Time Window 97% failing
Wind Speed 97% failing

Currently

Real-time conditions
Soil Temperature9.3°C
Dew Point6.3°C (moderate dew point)
Wind Speed4.1m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the extreme arctic frost conditions that make Finnish Lapland a winter photographer's paradise. We combine temperature, humidity, wind, and snow data to predict when the region's legendary frost phenomena will occur.

Finnish Lapland experiences frost conditions unlike anywhere else in accessible Europe. Temperatures routinely drop to -30°C or colder from December through February, creating frost phenomena that must be seen to be believed. The region's unique combination of humid air from the Atlantic meeting extreme cold creates the spectacular "tykkylumi" or crown snow phenomenon—where every tree branch becomes encased in thick layers of frost and snow.

What makes Finnish Lapland special for frost photography:

  • Tykkylumi crown snow - Trees completely transformed into white sculptures by accumulated frost and snow
  • Extreme cold tolerance - Consistent temperatures of -20°C to -40°C create reliable frost conditions
  • Ice flowers - Lake Inari and smaller water bodies develop crystalline ice formations
  • Frozen waterfalls - Waterfalls freeze into spectacular ice sculptures

Riisitunturi National Park near Kuusamo is world-famous for tykkylumi—every spruce tree on the fell tops becomes a ghostly white sentinel, transformed by weeks of accumulated frost. The phenomenon occurs when supercooled fog droplets freeze instantly on contact with trees, building up thick layers. Pallas-Yllästunturi offers similar conditions with the added drama of fell landscapes. At -30°C, even your breath creates instant frost crystals in the air, and any exposed water generates spectacular ice formations. The key is visiting during stable cold periods in midwinter—our forecast identifies when conditions favor crown snow accumulation and tracks visibility for photography.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 79 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Helsinki
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Sun, May 24
08:000%4.1m/s
09:000%3.8m/s
10:000%3.2m/s
11:000%3.6m/s
12:000%3.9m/s
13:000%4.2m/s
14:000%4.7m/s
15:000%4.5m/s
16:000%4.1m/s
17:000%4m/s
18:000%3.9m/s
19:000%3.7m/s
20:000%3.5m/s
21:000%3.3m/s
22:001.6%2.8m/s
23:001.9%2.2m/s
Mon, May 25
24:001.6%2m/s
01:001.6%2.6m/s
02:001.4%3m/s
03:001.4%3m/s
04:001.4%3m/s
05:001.4%3m/s
06:0018%3.1m/s
07:0018%3.4m/s
08:0026%3.6m/s
09:0026%3.4m/s
10:0031%3.3m/s
11:0031%3.2m/s
12:0035%3m/s
13:0033%2.8m/s
14:003.2%3.1m/s
15:003.2%3.2m/s
16:003.2%3.3m/s
17:003.2%3.3m/s
18:003.2%3.2m/s
19:003.2%2.9m/s
20:003.6%2.5m/s
21:003.6%2.3m/s
22:003.2%1.9m/s
23:003.4%1.5m/s
Tue, May 26
24:003.4%1.4m/s
01:003.4%1.5m/s
02:0030%1.6m/s
03:0028%1.7m/s
04:0030%1.6m/s
05:0030%1.5m/s
06:0033%1.9m/s
07:0033%2.2m/s
08:0037%2.5m/s
09:0037%2.5m/s
10:0035%2.7m/s
11:0031%2.8m/s
12:0031%2.9m/s
13:002.7%2.9m/s
14:002.7%2.8m/s
15:002.9%2.7m/s
16:002.9%2.8m/s
17:002.9%2.8m/s
18:002.7%2.8m/s
19:002.9%2.7m/s
20:003.2%2.4m/s
21:003.4%2.4m/s
22:003.6%2.7m/s
23:0035%3.1m/s
Wed, May 27
24:0035%3.4m/s
01:0035%3.7m/s
02:0035%4.1m/s
03:00-31%4.4m/s
04:00-29%4.6m/s
05:00-29%4.9m/s
06:00-2.5%5.1m/s
07:00-2.5%5.4m/s
08:00-2.3%5.6m/s
09:00-2.3%5.9m/s
10:00-2.5%5.5m/s
11:00-0%5.1m/s
12:00-0%4.6m/s
13:00-0%4.7m/s
14:00-0%4.8m/s
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Frost Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time
Europe/Helsinki
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sun, May 24 Sunrise 02:17 Sunset 24:17
16:00
6.3°C 9.3°C 7°C - 100% 0.05kPa
17:00
5.9°C 9°C 6.7°C - 100% 0.05kPa
18:00
5.6°C 8.8°C 6.7°C - 100% 0.07kPa
19:00
5.6°C 8.5°C 6.8°C - 100% 0.08kPa
20:00
5.6°C 8.3°C 6.8°C - 100% 0.08kPa
21:00
5.4°C 8.1°C 6.8°C - 100% 0.09kPa
22:00
5°C 7.9°C 6.6°C - 100% 0.1kPa
23:00
4.5°C 7.7°C 6.3°C - 100% 0.11kPa
Mon, May 25 Sunrise 02:17 Sunset 24:17
24:00
4.3°C 7.5°C 5.9°C - 100% 0.1kPa
01:00
4.1°C 7.3°C 5.6°C - 100% 0.09kPa
02:00
3.2°C 7.1°C 4.9°C - 100% 0.1kPa
03:00
2.4°C 6.8°C 4.2°C - 100% 0.1kPa
04:00
1.8°C 6.5°C 3.7°C - 100% 0.1kPa
05:00
1.5°C 6.1°C 3.5°C - 100% 0.1kPa
06:00
1.4°C 5.9°C 3.5°C - 100% 0.11kPa
07:00
1.3°C 5.7°C 3.8°C - 100% 0.13kPa
08:00
0.9°C 5.6°C 4.2°C - 100% 0.17kPa
09:00
0.8°C 5.5°C 4.7°C - 100% 0.2kPa
10:00
0.7°C 5.5°C 5.3°C - 100% 0.25kPa
11:00
0.5°C 5.6°C 6.1°C - 100% 0.31kPa
12:00
0.1°C 5.8°C 6.5°C - 100% 0.35kPa
13:00
-0.3°C 6°C 7.2°C - 100% 0.42kPa
14:00
-0.5°C 6.2°C 8°C - 100% 0.48kPa
15:00
-0.6°C 6.5°C 8.3°C - 100% 0.51kPa
16:00
-0.6°C 6.7°C 8.3°C - 100% 0.51kPa
17:00
-0.7°C 6.9°C 8.1°C - 100% 0.5kPa
18:00
-0.7°C 7°C 8.1°C - 100% 0.5kPa
19:00
-0.5°C 7.1°C 7.8°C - 100% 0.47kPa
20:00
0.1°C 7°C 7.1°C - 100% 0.39kPa
21:00
0.2°C 7°C 6.4°C - 100% 0.34kPa
22:00
0°C 6.8°C 5.8°C - 100% 0.31kPa
23:00
-0.1°C 6.6°C 5°C - 100% 0.26kPa
Tue, May 26 Sunrise 02:08 Sunset 24:26
24:00
-0.1°C 6.4°C 4.4°C - 100% 0.23kPa
01:00
-0.3°C 6.1°C 3.9°C - 100% 0.21kPa
02:00
-0.2°C 5.8°C 3.7°C - 100% 0.19kPa
03:00
-0.4°C 5.6°C 3.1°C - 100% 0.17kPa
04:00
-0.3°C 5.3°C 3°C - 100% 0.16kPa
05:00
-0.2°C 5.1°C 3.3°C - 100% 0.17kPa
06:00
-0.7°C 5°C 3.7°C - 100% 0.22kPa
07:00
-1.2°C 4.9°C 4.2°C - 100% 0.26kPa
08:00
-1.8°C 5°C 4.8°C - 100% 0.32kPa
09:00
-2.5°C 5.1°C 5.5°C - 100% 0.39kPa
10:00
-3°C 5.3°C 6.4°C - 100% 0.47kPa
11:00
-3.4°C 5.6°C 7.1°C - 100% 0.53kPa
12:00
-3.7°C 6°C 7.8°C - 100% 0.59kPa
13:00
-3.9°C 6.3°C 8.3°C - 100% 0.63kPa
14:00
-4°C 6.7°C 8.6°C - 100% 0.66kPa
15:00
-3.9°C 7°C 9°C - 100% 0.69kPa
16:00
-3.8°C 7.3°C 9°C - 100% 0.69kPa
17:00
-3.7°C 7.5°C 9°C - 100% 0.68kPa
18:00
-3.6°C 7.6°C 8.8°C - 100% 0.66kPa
19:00
-3.3°C 7.7°C 8.6°C - 100% 0.64kPa
20:00
-1.9°C 7.7°C 8.3°C - 100% 0.56kPa
21:00
-1.3°C 7.6°C 7.5°C - 100% 0.48kPa
22:00
-1.7°C 6.8°C 6.1°C - 100% 0.4kPa
23:00
-2.3°C 6°C 4.7°C - 100% 0.34kPa
Wed, May 27 Sunrise 01:58 Sunset 24:36
24:00
-2.9°C 5.2°C 3.2°C - 100% 0.28kPa
01:00
-3.2°C 5.2°C 4°C - 100% 0.33kPa
02:00
-3.7°C 5.2°C 4.7°C - 100% 0.39kPa
03:00
-4.2°C 5.2°C 5.5°C - 100% 0.45kPa
04:00
-4.1°C 5.5°C 6.5°C - 100% 0.51kPa
05:00
-4°C 5.8°C 7.5°C - 100% 0.58kPa
06:00
-4°C 6.1°C 8.6°C - 100% 0.66kPa
07:00
-3.2°C 6.5°C 9.5°C - 95% 0.7kPa
08:00
-2.3°C 7°C 10°C - 89% 0.75kPa
09:00
-1.4°C 7.5°C 11°C - 84% 0.8kPa
10:00
-0.7°C 7.8°C 11°C - 86% 0.76kPa
11:00
0°C 8.1°C 11°C - 89% 0.72kPa
12:00
0.7°C 8.4°C 11°C - 92% 0.68kPa
13:00
0.8°C 8.5°C 11°C - 67% 0.63kPa
14:00
1°C 8.6°C 10°C - 42% 0.59kPa
15:00
1.1°C 8.8°C 9.8°C - 18% 0.55kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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