What conditions does Morning Frost look for?

Time Window: Sunrise -45m to +90m. Frost Probability: ≥ 60.0%. Wind Speed: ≤ 1.5m/s

How often do conditions match?

There are 1 upcoming opportunity windows in the next 10 days.

More Morning Frost in Finnish Lapland

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Rule Morning Frost

Sodankylä - Morning Frost - Finnish Lapland

Sodankylä, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions

Frost Probability

50%

Soil Temperature-0.4°C

Dew Point-7.1°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

Next opportunity

Light Frost at Sunrise

Sodankylä

Fri, Apr 17 · 05:00–06:00 · 1h window

Low confidence

29%

❄️Frost Probability64%

Soil Temperature: 1.0°C

Dew Point: 1.5°C (low dew point)

Wind Speed: 1.4m/s (calm conditions)

Cloud Cover: 100%

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 91 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
Wed, Apr 8
08:00	✕	67%	0.93m/s
09:00	✕	71%	1.1m/s
10:00	✕	69%	1.7m/s
11:00	✕	69%	2.2m/s
12:00	✕	69%	2.4m/s
13:00	✕	67%	2.8m/s
14:00	✕	64%	3.1m/s
15:00	✕	67%	3.3m/s
16:00	✕	55%	3.5m/s
17:00	✕	52%	3.2m/s
18:00	✕	52%	3m/s
19:00	✕	52%	3.2m/s
20:00	✕	59%	3.2m/s
21:00	✕	52%	2.9m/s
22:00	✕	52%	3.9m/s
23:00	✕	50%	4.4m/s
Thu, Apr 9
24:00	✕	50%	4.6m/s
01:00	✕	50%	4.5m/s
02:00	✕	50%	4.3m/s
03:00	✕	50%	4.7m/s
04:00	✕	50%	4.9m/s
05:00	✓	50%	4.9m/s
06:00	✓	58%	4.9m/s
07:00	✓	58%	5.1m/s
08:00	✕	50%	5m/s
09:00	✕	50%	5.2m/s
10:00	✕	50%	5.4m/s
11:00	✕	50%	5.6m/s
12:00	✕	49%	5.7m/s
13:00	✕	49%	5.8m/s
14:00	✕	52%	5.9m/s
15:00	✕	59%	6m/s
16:00	✕	52%	6m/s
17:00	✕	62%	5.9m/s
18:00	✕	70%	5.7m/s
19:00	✕	72%	5.5m/s
20:00	✕	76%	5.1m/s
21:00	✕	76%	4.7m/s
22:00	✕	76%	4.6m/s
23:00	✕	76%	4.5m/s
Fri, Apr 10
24:00	✕	76%	4.5m/s
01:00	✕	76%	4.5m/s
02:00	✕	76%	4.7m/s
03:00	✕	76%	4.8m/s
04:00	✕	76%	5m/s
05:00	✓	76%	4.9m/s
06:00	✓	76%	4.8m/s
07:00	✓	76%	4.8m/s
08:00	✕	76%	4.9m/s
09:00	✕	76%	5.2m/s
10:00	✕	76%	5.4m/s
11:00	✕	74%	5.7m/s
12:00	✕	74%	5.8m/s
13:00	✕	66%	6m/s
14:00	✕	66%	6.1m/s
15:00	✕	66%	6.2m/s
16:00	✕	74%	6m/s
17:00	✕	74%	5.8m/s
18:00	✕	76%	5.6m/s
19:00	✕	76%	5.3m/s
20:00	✕	76%	4.9m/s
21:00	✕	76%	4.4m/s
22:00	✕	67%	4.1m/s
23:00	✕	67%	3.8m/s
Sat, Apr 11
24:00	✕	67%	3.3m/s
01:00	✕	67%	3m/s
02:00	✕	69%	2.7m/s
03:00	✕	69%	2.5m/s
04:00	✓	69%	2.5m/s
05:00	✓	69%	2.7m/s
06:00	✓	69%	2.5m/s
07:00	✓	54%	2.5m/s
08:00	✕	52%	2.9m/s
09:00	✕	52%	3.2m/s
10:00	✕	52%	3m/s
11:00	✕	50%	2.7m/s
12:00	✕	51%	2.5m/s
13:00	✕	51%	2.3m/s
14:00	✕	51%	2.1m/s
15:00	✕	51%	1.8m/s
16:00	✕	51%	1.8m/s
17:00	✕	53%	1.7m/s
18:00	✕	53%	1.6m/s
19:00	✕	53%	1.5m/s
20:00	✕	52%	1.4m/s
21:00	✕	52%	1.3m/s
22:00	✕	52%	1.3m/s
23:00	✕	52%	1.3m/s
Sun, Apr 12
24:00	✕	52%	1.3m/s
01:00	✕	53%	1.4m/s
02:00	✕	63%	1.5m/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
Thu, Apr 9 Sunrise 05:52 Sunset 20:40
04:00 ☾	-7.1°C	-0.4°C	-4.7°C	-	100%	0.07kPa
05:00 ☾	-7.1°C	-0.4°C	-4.5°C	-	100%	0.08kPa
06:00	-7.3°C	-0.4°C	-4.3°C	-	100%	0.09kPa
07:00	-7°C	-0.41°C	-3.8°C	-	100%	0.1kPa
08:00	-6.3°C	-0.41°C	-3.3°C	-	100%	0.1kPa
09:00	-5.5°C	-0.42°C	-2.6°C	-	96%	0.1kPa
10:00	-4.4°C	-0.42°C	-1.8°C	-	96%	0.09kPa
11:00	-3.3°C	-0.42°C	-0.66°C	-	82%	0.1kPa
12:00	-2.3°C	-0.45°C	0.05°C	-	71%	0.1kPa
13:00	-1.8°C	-0.45°C	0.29°C	-	62%	0.09kPa
14:00	-1.5°C	-0.45°C	0.54°C	-	44%	0.09kPa
15:00	-1.5°C	-0.41°C	0.66°C	-	20%	0.09kPa
16:00	-1.8°C	-0.41°C	0.59°C	-	51%	0.1kPa
17:00	-2.3°C	-0.41°C	0.65°C	-	25%	0.12kPa
18:00	-3.1°C	-0.43°C	0.47°C	-	25%	0.14kPa
19:00	-3.9°C	-0.43°C	-0.19°C	-	17%	0.15kPa
20:00	-5°C	-0.43°C	-1.2°C	-	5%	0.14kPa
21:00 ☾	-5.9°C	-0.43°C	-2.2°C	-	5%	0.13kPa
22:00 ☾	-6.8°C	-0.39°C	-2.9°C	-	5%	0.12kPa
23:00 ☾	-7.5°C	-0.39°C	-3.5°C	-	5%	0.12kPa
Fri, Apr 10 Sunrise 05:52 Sunset 20:40
24:00 ☾	-8°C	-0.39°C	-3.8°C	-	5%	0.12kPa
01:00 ☾	-8.3°C	-0.39°C	-3.9°C	-	5%	0.13kPa
02:00 ☾	-8.5°C	-0.4°C	-3.8°C	-	5%	0.14kPa
03:00 ☾	-8.8°C	-0.4°C	-3.7°C	-	5%	0.15kPa
04:00 ☾	-8.9°C	-0.41°C	-3.6°C	-	5%	0.15kPa
05:00 ☾	-8.8°C	-0.42°C	-3.8°C	-	5%	0.15kPa
06:00	-8.7°C	-0.42°C	-4°C	-	5%	0.14kPa
07:00	-8°C	-0.43°C	-3.6°C	-	5%	0.13kPa
08:00	-7°C	-0.43°C	-2.7°C	-	2%	0.14kPa
09:00	-5.7°C	-0.43°C	-1.5°C	-	4%	0.15kPa
10:00	-4.4°C	-0.44°C	-0.46°C	-	0%	0.15kPa
11:00	-3.3°C	-0.43°C	0.44°C	-	0%	0.15kPa
12:00	-2.4°C	-0.43°C	0.88°C	-	1%	0.14kPa
13:00	-1.7°C	-0.43°C	1.2°C	-	3%	0.13kPa
14:00	-1.4°C	-0.43°C	1.3°C	-	4%	0.12kPa
15:00	-1.6°C	-0.43°C	1.3°C	-	3%	0.13kPa
16:00	-1.9°C	-0.43°C	1.4°C	-	2%	0.14kPa
17:00	-2.3°C	-0.43°C	1.2°C	-	0%	0.15kPa
18:00	-2.8°C	-0.43°C	1°C	-	0%	0.16kPa
19:00	-3.3°C	-0.43°C	0.41°C	-	0%	0.15kPa
20:00	-4.1°C	-0.33°C	-0.64°C	-	1%	0.13kPa
21:00 ☾	-4.9°C	-0.33°C	-1.8°C	-	5%	0.11kPa
22:00 ☾	-5.5°C	-0.33°C	-2.6°C	-	5%	0.1kPa
23:00 ☾	-6.1°C	-0.38°C	-3.4°C	-	5%	0.09kPa
Sat, Apr 11 Sunrise 05:47 Sunset 20:44
24:00 ☾	-6.7°C	-0.38°C	-4.1°C	-	5%	0.08kPa
01:00 ☾	-7.4°C	-0.39°C	-4.9°C	-	5%	0.07kPa
02:00 ☾	-8°C	-0.4°C	-5.4°C	-	5%	0.07kPa
03:00 ☾	-8.3°C	-0.42°C	-5.9°C	-	5%	0.07kPa
04:00 ☾	-8.4°C	-0.43°C	-6.4°C	-	5%	0.06kPa
05:00 ☾	-8.3°C	-0.44°C	-6.4°C	-	5%	0.05kPa
06:00	-8.4°C	-0.46°C	-6.7°C	-	5%	0.05kPa
07:00	-7.7°C	-0.48°C	-5.9°C	-	80%	0.05kPa
08:00	-6°C	-0.49°C	-3.7°C	-	100%	0.07kPa
09:00	-4.4°C	-0.5°C	-1.8°C	-	100%	0.09kPa
10:00	-2.8°C	-0.47°C	-1°C	-	91%	0.07kPa
11:00	-1.2°C	-0.44°C	-0.21°C	-	82%	0.04kPa
12:00	0.4°C	-0.41°C	0.58°C	-	74%	0.01kPa
13:00	-0.6°C	-0.38°C	-0.28°C	-	73%	0.01kPa
14:00	-1.6°C	-0.36°C	-1.1°C	-	72%	0.02kPa
15:00	-2.5°C	-0.33°C	-2°C	-	72%	0.02kPa
16:00	-3.6°C	-0.34°C	-3.2°C	-	69%	0.01kPa
17:00	-4.7°C	-0.35°C	-4.5°C	-	67%	0.01kPa
18:00	-5.7°C	-0.37°C	-5.7°C	-	64%	0kPa
19:00	-5.5°C	-0.37°C	-5.5°C	-	73%	0kPa
20:00	-5.4°C	-0.38°C	-5.3°C	-	82%	0kPa
21:00 ☾	-5.2°C	-0.38°C	-5.1°C	-	91%	0kPa
22:00 ☾	-5.3°C	-0.4°C	-5.2°C	-	93%	0kPa
23:00 ☾	-5.4°C	-0.41°C	-5.2°C	-	96%	0kPa
Sun, Apr 12 Sunrise 05:43 Sunset 20:47
24:00 ☾	-5.4°C	-0.43°C	-5.3°C	-	98%	0kPa
01:00 ☾	-4.7°C	-0.46°C	-4.2°C	-	68%	0.02kPa
02:00 ☾	-4.1°C	-0.49°C	-3°C	-	37%	0.04kPa
03:00 ☾	-3.5°C	-0.52°C	-1.9°C	-	7%	0.06kPa

How to read: these inputs help produce the derived score; they are not requirements by themselves.

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