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Rule Morning Frost

Kilpisjärvi - Morning Frost - Finnish Lapland

Kilpisjärvi, 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 78% failing

Currently

Real-time conditions
Soil Temperature11.9°C
Dew Point6.7°C (moderate dew point)
Wind Speed6.7m/s (moderate winds)
Cloud Cover52%

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 95 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
Tue, Jul 7
16:00-1.4%1.7m/s
17:00-1.6%2.4m/s
18:00-1.6%2.7m/s
19:00-1.4%3m/s
20:00-1.7%3.7m/s
21:00-1.9%2.1m/s
22:00-2.1%1.7m/s
23:00-2.1%1.4m/s
Wed, Jul 8
24:00-2.1%1.2m/s
01:00-2.3%0.72m/s
02:00-2.4%0.22m/s
03:00-2.2%0.95m/s
04:00-2%0.63m/s
05:00-2.1%0.83m/s
06:00-2.1%1.6m/s
07:00-3.2%1.9m/s
08:00-3.2%2.5m/s
09:00-0%2.6m/s
10:00-0%2.2m/s
11:00-0%2.9m/s
12:00-0%3.4m/s
13:00-0%3.8m/s
14:00-0%4.2m/s
15:00-0%5.5m/s
16:00-0%5.6m/s
17:00-0%6.7m/s
18:00-0%7.6m/s
19:00-0%7.7m/s
20:00-0%7.8m/s
21:00-0%7.6m/s
22:00-0%7.1m/s
23:00-0%6.5m/s
Thu, Jul 9
24:00-0%6.1m/s
01:00-0%6.1m/s
02:00-0%5.3m/s
03:00-0%4.5m/s
04:00-0%3.5m/s
05:00-0%2.8m/s
06:00-0%2.5m/s
07:00-0%2.1m/s
08:00-0%1.9m/s
09:00-0%1.8m/s
10:00-0%1.2m/s
11:00-0%1.5m/s
12:00-0%2.2m/s
13:00-0%2.5m/s
14:00-0%2.5m/s
15:00-0%1.5m/s
16:00-0%1.7m/s
17:00-0%3m/s
18:00-0%3.8m/s
19:00-0%4.5m/s
20:00-0%4.6m/s
21:00-0%4.5m/s
22:00-0%4.6m/s
23:00-0%4.7m/s
Fri, Jul 10
24:00-0%3.3m/s
01:00-0%3m/s
02:00-0%3.4m/s
03:00-0%3.6m/s
04:00-0%3.2m/s
05:00-0%2m/s
06:00-0%1.4m/s
07:00-0%1m/s
08:00-0%0.92m/s
09:00-0%1.1m/s
10:00-0%1.5m/s
11:00-0%1.7m/s
12:00-0%1.7m/s
13:00-0%1.2m/s
14:00-0%1.4m/s
15:00-0%1.4m/s
16:00-0%0.81m/s
17:00-0%0.72m/s
18:00-0%0.94m/s
19:00-0%1.3m/s
20:00-0%1.1m/s
21:00-0%0.62m/s
22:00-0%1.2m/s
23:00-0%1.7m/s
Sat, Jul 11
24:00-0%2.3m/s
01:00-0%3.2m/s
02:00-0%4m/s
03:00-0%4.9m/s
04:00-0%5.6m/s
05:00-0%6.3m/s
06:00-0%7m/s
07:00-0%6.4m/s
08:00-0%5.7m/s
09:00-0%5m/s
10:00-0%5.2m/s
11:00-0%5.4m/s
12:00-0%5.5m/s
13:00-0%5.3m/s
14:00-0%5m/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
Wed, Jul 8
17:00
6.7°C 12°C 14°C - 52% 0.59kPa
18:00
6.6°C 12°C 14°C - 17% 0.6kPa
19:00
6.7°C 12°C 13°C - 32% 0.53kPa
20:00
6.9°C 13°C 12°C - 15% 0.44kPa
21:00
6.9°C 12°C 11°C - 29% 0.35kPa
22:00
6.9°C 12°C 10°C - 14% 0.27kPa
23:00
6.8°C 12°C 9.3°C - 56% 0.18kPa
Thu, Jul 9
24:00
6.8°C 12°C 9°C - 46% 0.16kPa
01:00
6.9°C 11°C 8.6°C - 16% 0.13kPa
02:00
6.9°C 11°C 8.1°C - 8% 0.09kPa
03:00
6.7°C 11°C 7.8°C - 12% 0.07kPa
04:00
6.7°C 10°C 7.9°C - 22% 0.08kPa
05:00
6.9°C 10°C 8.4°C - 31% 0.1kPa
06:00
6.9°C 10°C 9.2°C - 36% 0.17kPa
07:00
6.6°C 10°C 10°C - 53% 0.25kPa
08:00
6°C 10°C 11°C - 69% 0.35kPa
09:00
5.7°C 11°C 11°C - 61% 0.44kPa
10:00
5.4°C 11°C 12°C - 64% 0.51kPa
11:00
5.5°C 12°C 13°C - 97% 0.58kPa
12:00
5.3°C 12°C 13°C - 100% 0.62kPa
13:00
5.5°C 12°C 13°C - 92% 0.57kPa
14:00
5.9°C 12°C 13°C - 60% 0.55kPa
15:00
5.9°C 13°C 14°C - 95% 0.62kPa
16:00
6°C 14°C 14°C - 100% 0.66kPa
17:00
6.3°C 14°C 14°C - 100% 0.6kPa
18:00
7.1°C 14°C 13°C - 98% 0.52kPa
19:00
7.7°C 14°C 13°C - 100% 0.48kPa
20:00
7.9°C 14°C 14°C - 100% 0.5kPa
21:00
8.2°C 14°C 14°C - 100% 0.48kPa
22:00
8.4°C 13°C 13°C - 100% 0.4kPa
23:00
8.3°C 13°C 13°C - 100% 0.37kPa
Fri, Jul 10
24:00
8.2°C 13°C 12°C - 99% 0.32kPa
01:00
8.4°C 13°C 11°C - 100% 0.25kPa
02:00
8.5°C 13°C 11°C - 100% 0.22kPa
03:00
8.5°C 12°C 11°C - 100% 0.22kPa
04:00
8.5°C 12°C 11°C - 100% 0.22kPa
05:00
8.7°C 12°C 11°C - 100% 0.19kPa
06:00
8.9°C 12°C 11°C - 100% 0.19kPa
07:00
8.7°C 12°C 12°C - 82% 0.26kPa
08:00
8.6°C 12°C 13°C - 100% 0.35kPa
09:00
8.4°C 12°C 14°C - 72% 0.47kPa
10:00
8.3°C 13°C 15°C - 79% 0.58kPa
11:00
8.4°C 13°C 16°C - 100% 0.66kPa
12:00
8.5°C 13°C 16°C - 100% 0.66kPa
13:00
8.9°C 13°C 15°C - 93% 0.59kPa
14:00
8.5°C 14°C 16°C - 100% 0.7kPa
15:00
9°C 14°C 16°C - 100% 0.64kPa
16:00
8.7°C 14°C 16°C - 79% 0.7kPa
17:00
8.9°C 15°C 17°C - 37% 0.77kPa
18:00
9.2°C 15°C 18°C - 64% 0.84kPa
19:00
9.5°C 16°C 18°C - 73% 0.89kPa
20:00
10°C 16°C 18°C - 100% 0.76kPa
21:00
11°C 16°C 16°C - 87% 0.52kPa
22:00
11°C 15°C 15°C - 80% 0.47kPa
23:00
11°C 14°C 15°C - 72% 0.42kPa
Sat, Jul 11
24:00
10°C 13°C 14°C - 64% 0.38kPa
01:00
10°C 13°C 15°C - 54% 0.48kPa
02:00
10°C 14°C 16°C - 44% 0.6kPa
03:00
10°C 14°C 17°C - 34% 0.72kPa
04:00
10°C 14°C 18°C - 56% 0.8kPa
05:00
10°C 15°C 18°C - 78% 0.87kPa
06:00
10°C 15°C 19°C - 100% 0.95kPa
07:00
11°C 15°C 18°C - 100% 0.81kPa
08:00
11°C 16°C 18°C - 100% 0.69kPa
09:00
12°C 16°C 17°C - 100% 0.57kPa
10:00
11°C 16°C 15°C - 99% 0.39kPa
11:00
11°C 15°C 13°C - 99% 0.24kPa
12:00
9.6°C 15°C 11°C - 98% 0.12kPa
13:00
9.2°C 15°C 11°C - 99% 0.13kPa
14:00
8.7°C 14°C 11°C - 99% 0.15kPa
15:00
8.3°C 14°C 10°C - 100% 0.16kPa
16:00
7.9°C 13°C 9.8°C - 100% 0.14kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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