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Rule Morning Frost

Utsjoki - Morning Frost - Finnish Lapland

Utsjoki, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

No opportunities right now
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)
Time Window 100% failing
Frost Probability 100% failing
Wind Speed 94% failing

Currently

Real-time conditions
Soil Temperature12.1°C
Dew Point-1.0°C (low dew point)
Wind Speed4.9m/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
08:00-2.3%4.4m/s
09:00-2.6%6m/s
10:00-0%5m/s
11:00-0%5.2m/s
12:00-0%5.2m/s
13:00-0%4.6m/s
14:00-0%5m/s
15:00-0%5m/s
16:00-0%4.9m/s
17:00-0%5m/s
18:00-0%5.3m/s
19:00-0%5.3m/s
20:00-0%4.8m/s
21:00-0%4.3m/s
22:00-0%4m/s
23:00-0%3.9m/s
Mon, May 25
24:00-0%4m/s
01:00-3.1%4m/s
02:00-2.9%4.1m/s
03:00-30%3.7m/s
04:00-33%3.7m/s
05:00-33%3.6m/s
06:00-27%3.3m/s
07:00-31%3.4m/s
08:00-31%3.5m/s
09:00-35%3.6m/s
10:00-3.4%3.6m/s
11:00-3.4%3.8m/s
12:00-0%3.7m/s
13:00-0%3.2m/s
14:00-0%2.8m/s
15:00-0%2.6m/s
16:00-0%2.7m/s
17:00-0%2.9m/s
18:00-0%3.6m/s
19:00-0%4.1m/s
20:00-0%3.5m/s
21:00-0%3m/s
22:00-0%2.5m/s
23:00-0%2.6m/s
Tue, May 26
24:00-0%2.9m/s
01:00-3.6%1.8m/s
02:00-3.4%1.6m/s
03:00-3.2%1.7m/s
04:00-3.2%1.8m/s
05:00-33%1.9m/s
06:00-33%1.9m/s
07:00-33%1.9m/s
08:00-33%1.8m/s
09:00-3.4%1.5m/s
10:00-3.8%1.6m/s
11:00-3.6%2.1m/s
12:00-0%2.4m/s
13:00-0%2.8m/s
14:00-0%3.3m/s
15:00-0%4m/s
16:00-0%4.8m/s
17:00-0%5.1m/s
18:00-0%5m/s
19:00-0%4.8m/s
20:00-0%4.6m/s
21:00-0%4.5m/s
22:00-0%3.3m/s
23:00-3.6%2.2m/s
Wed, May 27
24:00-35%1m/s
01:00-35%1.1m/s
02:00-39%1.1m/s
03:00-3.8%1.2m/s
04:00-3.6%1.9m/s
05:00-0%2.6m/s
06:00-0%3.3m/s
07:00-0%4.3m/s
08:00-0%5.4m/s
09:00-0%6.4m/s
10:00-0%6.6m/s
11:00-0%6.7m/s
12:00-0%6.9m/s
13:00-0%6.9m/s
14:00-0%6.9m/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
16:00
-1°C 12°C 7.4°C - 100% 0.46kPa
17:00
-0.9°C 12°C 7.3°C - 99% 0.45kPa
18:00
-0.9°C 12°C 6.8°C - 100% 0.42kPa
19:00
-1°C 12°C 5.9°C - 100% 0.36kPa
20:00
-1.2°C 11°C 5.2°C - 100% 0.33kPa
21:00
-1.3°C 10°C 4.9°C - 100% 0.31kPa
22:00
-1.4°C 9.7°C 4.6°C - 100% 0.3kPa
23:00
-1.3°C 8.9°C 4.5°C - 97% 0.29kPa
Mon, May 25
24:00
-1.2°C 8.1°C 3.9°C - 58% 0.25kPa
01:00
-1.2°C 7.3°C 3.2°C - 67% 0.21kPa
02:00
-1.4°C 6.6°C 2.6°C - 55% 0.19kPa
03:00
-1.5°C 6°C 2.1°C - 54% 0.17kPa
04:00
-1.7°C 5.5°C 2.1°C - 28% 0.17kPa
05:00
-1.9°C 5°C 2.1°C - 34% 0.18kPa
06:00
-2°C 4.9°C 2.3°C - 70% 0.19kPa
07:00
-2.3°C 5°C 2.6°C - 97% 0.22kPa
08:00
-2.4°C 5.3°C 3.1°C - 100% 0.25kPa
09:00
-2.6°C 5.8°C 3.7°C - 100% 0.29kPa
10:00
-2.6°C 6.5°C 4.2°C - 100% 0.32kPa
11:00
-2.8°C 7.3°C 4.7°C - 100% 0.35kPa
12:00
-2.7°C 8.2°C 5.2°C - 100% 0.38kPa
13:00
-2.8°C 9°C 5.6°C - 100% 0.41kPa
14:00
-2.9°C 10°C 6.2°C - 92% 0.45kPa
15:00
-3.1°C 11°C 6.6°C - 96% 0.49kPa
16:00
-3.1°C 11°C 7°C - 100% 0.51kPa
17:00
-3°C 12°C 7.2°C - 100% 0.52kPa
18:00
-2.7°C 12°C 7.3°C - 100% 0.52kPa
19:00
-2.4°C 11°C 7°C - 100% 0.49kPa
20:00
-1.9°C 11°C 6.3°C - 100% 0.43kPa
21:00
-1.8°C 10°C 5.7°C - 100% 0.38kPa
22:00
-1.7°C 9.8°C 5.2°C - 100% 0.34kPa
23:00
-1.7°C 9.1°C 4.6°C - 100% 0.31kPa
Tue, May 26
24:00
-2.1°C 8.4°C 4.1°C - 100% 0.3kPa
01:00
-2.4°C 7.8°C 3.6°C - 100% 0.28kPa
02:00
-2.5°C 7.2°C 3.4°C - 100% 0.27kPa
03:00
-2.4°C 6.7°C 3.2°C - 100% 0.26kPa
04:00
-2.3°C 6.2°C 3.2°C - 100% 0.25kPa
05:00
-2.3°C 5.9°C 3.1°C - 100% 0.25kPa
06:00
-2.3°C 5.8°C 3.1°C - 100% 0.25kPa
07:00
-2.1°C 5.8°C 3.4°C - 100% 0.26kPa
08:00
-1.9°C 6°C 3.7°C - 100% 0.27kPa
09:00
-1.7°C 6.4°C 4.1°C - 100% 0.28kPa
10:00
-1.3°C 7.1°C 4.7°C - 100% 0.3kPa
11:00
-1.1°C 7.8°C 5.4°C - 100% 0.33kPa
12:00
-0.8°C 8.6°C 6.1°C - 100% 0.36kPa
13:00
-0.6°C 9.4°C 6.8°C - 100% 0.4kPa
14:00
-0.7°C 10°C 7.2°C - 100% 0.44kPa
15:00
-0.8°C 11°C 7.5°C - 100% 0.46kPa
16:00
-1.1°C 11°C 7.5°C - 100% 0.47kPa
17:00
-2°C 11°C 7.1°C - 100% 0.48kPa
18:00
-3.3°C 11°C 6.7°C - 100% 0.5kPa
19:00
-4.6°C 11°C 6.1°C - 100% 0.51kPa
20:00
-5°C 10°C 5.6°C - 100% 0.49kPa
21:00
-4.9°C 9.6°C 4.9°C - 100% 0.44kPa
22:00
-4.1°C 8°C 3.9°C - 100% 0.36kPa
23:00
-3.6°C 6.5°C 2.9°C - 100% 0.28kPa
Wed, May 27
24:00
-3.2°C 4.9°C 1.9°C - 100% 0.21kPa
01:00
-3°C 5.3°C 2.5°C - 95% 0.24kPa
02:00
-2.9°C 5.7°C 3.1°C - 90% 0.27kPa
03:00
-2.9°C 6.1°C 3.8°C - 84% 0.3kPa
04:00
-2.4°C 7.2°C 5°C - 81% 0.36kPa
05:00
-2°C 8.4°C 6.2°C - 77% 0.42kPa
06:00
-1.6°C 9.5°C 7.4°C - 73% 0.48kPa
07:00
-1.4°C 10°C 8.1°C - 81% 0.53kPa
08:00
-1.3°C 11°C 8.9°C - 89% 0.58kPa
09:00
-1.2°C 12°C 9.6°C - 97% 0.64kPa
10:00
-1.2°C 12°C 9.4°C - 87% 0.62kPa
11:00
-1.3°C 12°C 9.1°C - 77% 0.6kPa
12:00
-1.3°C 12°C 8.8°C - 66% 0.58kPa
13:00
-1.3°C 12°C 8.2°C - 67% 0.53kPa
14:00
-1.2°C 12°C 7.6°C - 67% 0.48kPa
15:00
-1.2°C 11°C 7°C - 67% 0.44kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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