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 2 upcoming opportunity windows in the next 10 days.

More Morning Frost in Finnish Lapland

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Rule Morning Frost

Luosto - Morning Frost - Finnish Lapland

Luosto, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions

Frost Probability

52%

Soil Temperature-0.5°C

Dew Point-8.0°C (low dew point)

Wind Speed3.5m/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 Dawn

Luosto

Sun, Apr 12 · 04:54–05:00 · 1h window

Low confidence

37%

❄️Frost Probability63%

Soil Temperature: -0.7°C

Dew Point: -1.8°C (low dew point)

Wind Speed: 1.3m/s (calm conditions)

Cloud Cover: 35%

Light Frost at Sunrise

Luosto

Sun, Apr 12 · 05:00–06:00

❄️Frost Probability:60%

Low

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 92 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
07:00	✓	55%	0.79m/s
08:00	✕	67%	0.86m/s
09:00	✕	71%	1.1m/s
10:00	✕	71%	1.4m/s
11:00	✕	69%	1.8m/s
12:00	✕	58%	1.9m/s
13:00	✕	55%	2.2m/s
14:00	✕	55%	2.5m/s
15:00	✕	64%	3m/s
16:00	✕	59%	2.9m/s
17:00	✕	59%	2.9m/s
18:00	✕	54%	2.6m/s
19:00	✕	54%	2.3m/s
20:00	✕	61%	1.9m/s
21:00	✕	54%	2.1m/s
22:00	✕	50%	2.2m/s
23:00	✕	48%	3m/s
Thu, Apr 9
24:00	✕	52%	3.3m/s
01:00	✕	52%	3.1m/s
02:00	✕	54%	2.6m/s
03:00	✕	52%	2.9m/s
04:00	✕	52%	3.5m/s
05:00	✓	50%	4.4m/s
06:00	✓	58%	4.4m/s
07:00	✓	58%	4.4m/s
08:00	✕	50%	4.4m/s
09:00	✕	50%	4.9m/s
10:00	✕	50%	5.1m/s
11:00	✕	50%	5.3m/s
12:00	✕	51%	5.5m/s
13:00	✕	49%	5.7m/s
14:00	✕	55%	5.7m/s
15:00	✕	52%	5.6m/s
16:00	✕	52%	5.7m/s
17:00	✕	60%	5.9m/s
18:00	✕	70%	5.6m/s
19:00	✕	72%	5.4m/s
20:00	✕	76%	5.2m/s
21:00	✕	76%	4.8m/s
22:00	✕	76%	4.6m/s
23:00	✕	76%	4.4m/s
Fri, Apr 10
24:00	✕	76%	4.4m/s
01:00	✕	76%	4.3m/s
02:00	✕	76%	4.4m/s
03:00	✕	76%	4.5m/s
04:00	✕	76%	4.5m/s
05:00	✓	76%	4.4m/s
06:00	✓	76%	4.3m/s
07:00	✓	76%	4.3m/s
08:00	✕	76%	4.6m/s
09:00	✕	76%	5.1m/s
10:00	✕	76%	5.4m/s
11:00	✕	74%	5.6m/s
12:00	✕	74%	5.9m/s
13:00	✕	74%	5.9m/s
14:00	✕	74%	5.8m/s
15:00	✕	74%	5.7m/s
16:00	✕	74%	5.6m/s
17:00	✕	74%	5.6m/s
18:00	✕	76%	5.5m/s
19:00	✕	76%	5.2m/s
20:00	✕	76%	4.7m/s
21:00	✕	78%	4m/s
22:00	✕	78%	3.5m/s
23:00	✕	69%	2.6m/s
Sat, Apr 11
24:00	✕	69%	2.2m/s
01:00	✕	69%	2m/s
02:00	✕	69%	2m/s
03:00	✕	65%	1.9m/s
04:00	✓	69%	1.9m/s
05:00	✓	69%	1.8m/s
06:00	✓	61%	1.7m/s
07:00	✓	55%	1.9m/s
08:00	✕	54%	2m/s
09:00	✕	54%	2.1m/s
10:00	✕	54%	1.9m/s
11:00	✕	53%	1.6m/s
12:00	✕	53%	1.4m/s
13:00	✕	53%	1.3m/s
14:00	✕	53%	1.1m/s
15:00	✕	52%	1m/s
16:00	✕	52%	1.1m/s
17:00	✕	53%	1.1m/s
18:00	✕	53%	1.2m/s
19:00	✕	52%	1.2m/s
20:00	✕	52%	1.2m/s
21:00	✕	52%	1.2m/s
22:00	✕	52%	1.1m/s
23:00	✕	52%	0.99m/s
Sun, Apr 12
24:00	✕	52%	0.9m/s
01:00	✕	53%	0.98m/s
02:00	✕	63%	1.1m/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 05:51 Sunset 20:38
04:00 ☾	-8°C	-0.52°C	-5.7°C	-	100%	0.06kPa
05:00 ☾	-7.4°C	-0.52°C	-4.6°C	-	100%	0.08kPa
06:00	-7.3°C	-0.53°C	-4.3°C	-	100%	0.09kPa
07:00	-7.1°C	-0.54°C	-4.1°C	-	100%	0.09kPa
08:00	-6.4°C	-0.54°C	-3.6°C	-	97%	0.09kPa
09:00	-5.6°C	-0.55°C	-2.8°C	-	97%	0.09kPa
10:00	-4.4°C	-0.55°C	-1.8°C	-	97%	0.1kPa
11:00	-3.3°C	-0.55°C	-0.66°C	-	85%	0.1kPa
12:00	-2.5°C	-0.55°C	-0.05°C	-	61%	0.1kPa
13:00	-2.1°C	-0.55°C	0.19°C	-	66%	0.1kPa
14:00	-1.9°C	-0.55°C	0.44°C	-	40%	0.1kPa
15:00	-1.9°C	-0.51°C	0.56°C	-	77%	0.11kPa
16:00	-2.3°C	-0.51°C	0.69°C	-	77%	0.12kPa
17:00	-2.9°C	-0.51°C	0.75°C	-	62%	0.15kPa
18:00	-3.7°C	-0.53°C	0.47°C	-	24%	0.17kPa
19:00	-4.9°C	-0.53°C	-0.39°C	-	12%	0.17kPa
20:00	-6°C	-0.53°C	-1.3°C	-	5%	0.16kPa
21:00 ☾	-7°C	-0.53°C	-2.4°C	-	5%	0.15kPa
22:00 ☾	-7.5°C	-0.54°C	-3°C	-	5%	0.14kPa
23:00 ☾	-8°C	-0.54°C	-3.4°C	-	5%	0.14kPa
Fri, Apr 10 Sunrise 05:51 Sunset 20:38
24:00 ☾	-8.2°C	-0.54°C	-3.7°C	-	4%	0.14kPa
01:00 ☾	-8.4°C	-0.54°C	-3.9°C	-	5%	0.13kPa
02:00 ☾	-8.4°C	-0.54°C	-3.9°C	-	5%	0.13kPa
03:00 ☾	-8.5°C	-0.54°C	-3.9°C	-	5%	0.14kPa
04:00 ☾	-8.5°C	-0.54°C	-3.8°C	-	5%	0.14kPa
05:00 ☾	-8.4°C	-0.55°C	-4°C	-	5%	0.13kPa
06:00	-8.1°C	-0.56°C	-4.1°C	-	5%	0.12kPa
07:00	-7.7°C	-0.57°C	-3.9°C	-	0%	0.12kPa
08:00	-6.5°C	-0.58°C	-2.8°C	-	0%	0.12kPa
09:00	-5.4°C	-0.58°C	-1.6°C	-	3%	0.14kPa
10:00	-4.3°C	-0.58°C	-0.36°C	-	3%	0.15kPa
11:00	-3.2°C	-0.63°C	0.44°C	-	0%	0.15kPa
12:00	-2.4°C	-0.63°C	0.88°C	-	0%	0.14kPa
13:00	-1.9°C	-0.63°C	1.1°C	-	0%	0.13kPa
14:00	-1.8°C	-0.63°C	1.2°C	-	0%	0.13kPa
15:00	-2°C	-0.63°C	1.5°C	-	0%	0.15kPa
16:00	-2.5°C	-0.63°C	1.4°C	-	0%	0.16kPa
17:00	-2.9°C	-0.63°C	1.3°C	-	0%	0.18kPa
18:00	-3.4°C	-0.63°C	1°C	-	0%	0.18kPa
19:00	-3.9°C	-0.53°C	0.31°C	-	0%	0.17kPa
20:00	-4.9°C	-0.53°C	-0.84°C	-	0%	0.15kPa
21:00 ☾	-5.9°C	-0.53°C	-2°C	-	0%	0.13kPa
22:00 ☾	-6.6°C	-0.53°C	-3°C	-	2%	0.12kPa
23:00 ☾	-7.8°C	-0.56°C	-5.1°C	-	3%	0.08kPa
Sat, Apr 11 Sunrise 05:47 Sunset 20:41
24:00 ☾	-9.2°C	-0.55°C	-7.2°C	-	5%	0.05kPa
01:00 ☾	-10°C	-0.55°C	-8.6°C	-	5%	0.04kPa
02:00 ☾	-11°C	-0.55°C	-9.4°C	-	5%	0.03kPa
03:00 ☾	-11°C	-0.56°C	-10°C	-	5%	0.02kPa
04:00 ☾	-11°C	-0.6°C	-10°C	-	5%	0.02kPa
05:00 ☾	-11°C	-0.62°C	-10°C	-	9%	0.02kPa
06:00	-11°C	-0.66°C	-10°C	-	13%	0.02kPa
07:00	-9.7°C	-0.7°C	-8.3°C	-	76%	0.03kPa
08:00	-6.4°C	-0.72°C	-4.2°C	-	100%	0.07kPa
09:00	-4.6°C	-0.72°C	-2°C	-	100%	0.09kPa
10:00	-2.9°C	-0.69°C	-1.2°C	-	90%	0.07kPa
11:00	-1.3°C	-0.65°C	-0.35°C	-	79%	0.04kPa
12:00	0.3°C	-0.61°C	0.48°C	-	68%	0.01kPa
13:00	-0.7°C	-0.58°C	-0.48°C	-	74%	0.01kPa
14:00	-1.7°C	-0.56°C	-1.4°C	-	79%	0.01kPa
15:00	-2.6°C	-0.53°C	-2.4°C	-	84%	0.01kPa
16:00	-3.3°C	-0.54°C	-3.2°C	-	81%	0.01kPa
17:00	-4°C	-0.55°C	-3.9°C	-	78%	0kPa
18:00	-4.7°C	-0.57°C	-4.7°C	-	75%	0kPa
19:00	-4.6°C	-0.57°C	-4.6°C	-	82%	0kPa
20:00	-4.5°C	-0.57°C	-4.4°C	-	88%	0kPa
21:00 ☾	-4.4°C	-0.57°C	-4.3°C	-	94%	0kPa
22:00 ☾	-4.6°C	-0.61°C	-4.5°C	-	92%	0kPa
23:00 ☾	-4.9°C	-0.64°C	-4.8°C	-	90%	0kPa
Sun, Apr 12 Sunrise 05:43 Sunset 20:45
24:00 ☾	-5.1°C	-0.67°C	-5°C	-	88%	0kPa
01:00 ☾	-4.3°C	-0.69°C	-3.5°C	-	63%	0.03kPa
02:00 ☾	-3.6°C	-0.71°C	-2.1°C	-	37%	0.06kPa
03:00 ☾	-3°C	-0.73°C	-0.59°C	-	11%	0.09kPa

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

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