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

Nellim - Morning Frost - Finnish Lapland

Nellimö, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions

Frost Probability

59%

Soil Temperature-1.4°C

Dew Point-7.4°C (low dew point)

Wind Speed7.3m/s (moderate winds)

Cloud Cover92%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

Next opportunity

Light Frost at Sunrise

Nellim

Fri, Apr 17 · 04:17–05:00 · 1h window

Low confidence

31%

❄️Frost Probability60%

Soil Temperature: 1.7°C

Dew Point: -0.7°C (low dew point)

Wind Speed: 1.1m/s (calm conditions)

Cloud Cover: 63%

Light Frost (radiative) at Sunrise

Nellim

Fri, Apr 17 · 06:00–06:32

❄️Frost Probability:63%

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 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	✕	71%	1.2m/s
09:00	✕	80%	1.9m/s
10:00	✕	80%	2.4m/s
11:00	✕	78%	3.2m/s
12:00	✕	87%	3.8m/s
13:00	✕	85%	4.4m/s
14:00	✕	77%	5.1m/s
15:00	✕	81%	5.1m/s
16:00	✕	70%	5.2m/s
17:00	✕	61%	5m/s
18:00	✕	61%	5.4m/s
19:00	✕	62%	5.6m/s
20:00	✕	49%	5.7m/s
21:00	✕	48%	6m/s
22:00	✕	48%	6.5m/s
23:00	✕	48%	6.6m/s
Thu, Apr 9
24:00	✕	48%	6.9m/s
01:00	✕	56%	7m/s
02:00	✕	59%	7.2m/s
03:00	✕	59%	7.2m/s
04:00	✓	59%	7.3m/s
05:00	✓	59%	6.9m/s
06:00	✓	60%	6.9m/s
07:00	✓	59%	6.7m/s
08:00	✕	60%	6.5m/s
09:00	✕	63%	6.7m/s
10:00	✕	63%	7.1m/s
11:00	✕	59%	7m/s
12:00	✕	64%	6.9m/s
13:00	✕	64%	7.1m/s
14:00	✕	64%	7.1m/s
15:00	✕	60%	7m/s
16:00	✕	63%	7m/s
17:00	✕	60%	6.9m/s
18:00	✕	60%	6.7m/s
19:00	✕	59%	6.4m/s
20:00	✕	51%	6m/s
21:00	✕	51%	5.9m/s
22:00	✕	59%	6.1m/s
23:00	✕	59%	6.2m/s
Fri, Apr 10
24:00	✕	60%	6.2m/s
01:00	✕	66%	5.9m/s
02:00	✕	74%	5.7m/s
03:00	✕	76%	5.5m/s
04:00	✓	68%	5.6m/s
05:00	✓	70%	5.7m/s
06:00	✓	74%	5.9m/s
07:00	✓	78%	6.2m/s
08:00	✕	83%	6.3m/s
09:00	✕	83%	6.5m/s
10:00	✕	83%	6.6m/s
11:00	✕	83%	6.8m/s
12:00	✕	83%	6.9m/s
13:00	✕	83%	7.1m/s
14:00	✕	83%	7.1m/s
15:00	✕	83%	7.2m/s
16:00	✕	83%	7.1m/s
17:00	✕	79%	6.8m/s
18:00	✕	79%	6.7m/s
19:00	✕	79%	6.4m/s
20:00	✕	74%	6.1m/s
21:00	✕	74%	5.9m/s
22:00	✕	74%	5.8m/s
23:00	✕	74%	5.8m/s
Sat, Apr 11
24:00	✕	74%	5.6m/s
01:00	✕	76%	5.2m/s
02:00	✕	76%	4.8m/s
03:00	✕	76%	4.4m/s
04:00	✓	78%	3.9m/s
05:00	✓	78%	3.7m/s
06:00	✓	70%	3.6m/s
07:00	✕	63%	3.5m/s
08:00	✕	63%	3.7m/s
09:00	✕	61%	4.3m/s
10:00	✕	63%	3.7m/s
11:00	✕	63%	3.2m/s
12:00	✕	65%	2.6m/s
13:00	✕	65%	2.6m/s
14:00	✕	54%	2.6m/s
15:00	✕	54%	2.5m/s
16:00	✕	55%	2.6m/s
17:00	✕	58%	2.7m/s
18:00	✕	57%	2.8m/s
19:00	✕	59%	2.9m/s
20:00	✕	63%	2.9m/s
21:00	✕	63%	3m/s
22:00	✕	63%	2.9m/s
23:00	✕	63%	2.8m/s
Sun, Apr 12
24:00	✕	65%	2.8m/s
01:00	✕	63%	3m/s
02:00	✕	70%	3.3m/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 05:38 Sunset 20:40
04:00 ☾	-7.4°C	-1.4°C	-3.2°C	-	92%	0.13kPa
05:00 ☾	-8°C	-1.5°C	-3.3°C	-	92%	0.14kPa
06:00	-8°C	-1.5°C	-3.4°C	-	74%	0.14kPa
07:00	-7.4°C	-1.6°C	-3.2°C	-	88%	0.13kPa
08:00	-6.2°C	-1.6°C	-2.3°C	-	78%	0.13kPa
09:00	-5.5°C	-1.6°C	-1.4°C	-	48%	0.15kPa
10:00	-5.3°C	-1.6°C	-0.47°C	-	43%	0.18kPa
11:00	-5.1°C	-1.6°C	0.24°C	-	100%	0.2kPa
12:00	-5°C	-1.5°C	0.75°C	-	92%	0.22kPa
13:00	-3.9°C	-1.4°C	1.5°C	-	100%	0.22kPa
14:00	-2.9°C	-1.4°C	1.9°C	-	81%	0.21kPa
15:00	-2.1°C	-1.2°C	2.4°C	-	71%	0.2kPa
16:00	-1.8°C	-1°C	2.3°C	-	53%	0.19kPa
17:00	-1.6°C	-0.91°C	2.1°C	-	76%	0.17kPa
18:00	-1.7°C	-0.83°C	1.7°C	-	76%	0.15kPa
19:00	-1.9°C	-0.63°C	1.1°C	-	92%	0.13kPa
20:00	-2.2°C	-0.63°C	0.67°C	-	100%	0.12kPa
21:00 ☾	-2.5°C	-0.53°C	0.43°C	-	100%	0.12kPa
22:00 ☾	-3°C	-0.54°C	0.07°C	-	100%	0.12kPa
23:00 ☾	-3.5°C	-0.54°C	-0.32°C	-	89%	0.12kPa
Fri, Apr 10 Sunrise 05:38 Sunset 20:40
24:00 ☾	-4.2°C	-0.54°C	-1°C	-	63%	0.12kPa
01:00 ☾	-5.1°C	-0.54°C	-1.8°C	-	40%	0.12kPa
02:00 ☾	-5.9°C	-0.54°C	-2.2°C	-	9%	0.13kPa
03:00 ☾	-6.5°C	-0.54°C	-2.3°C	-	6%	0.14kPa
04:00 ☾	-7.1°C	-0.55°C	-2.4°C	-	25%	0.15kPa
05:00 ☾	-8°C	-0.65°C	-2.6°C	-	16%	0.17kPa
06:00	-8.5°C	-0.77°C	-2.6°C	-	5%	0.18kPa
07:00	-8.5°C	-0.94°C	-2.3°C	-	5%	0.2kPa
08:00	-8°C	-1°C	-1.5°C	-	5%	0.21kPa
09:00	-7.2°C	-1°C	-0.51°C	-	5%	0.23kPa
10:00	-6.2°C	-1°C	0.54°C	-	5%	0.25kPa
11:00	-5.4°C	-1°C	1.5°C	-	5%	0.27kPa
12:00	-4.5°C	-1°C	2.5°C	-	0%	0.29kPa
13:00	-3.7°C	-0.83°C	3.2°C	-	0%	0.31kPa
14:00	-3.2°C	-0.63°C	3.7°C	-	0%	0.32kPa
15:00	-2.6°C	-0.53°C	4°C	-	0%	0.31kPa
16:00	-2.3°C	-0.33°C	3.9°C	-	4%	0.29kPa
17:00	-2.1°C	-0.33°C	3.5°C	-	2%	0.26kPa
18:00	-2.3°C	-0.23°C	2.9°C	-	2%	0.24kPa
19:00	-2.6°C	-0.23°C	2.1°C	-	5%	0.21kPa
20:00	-3°C	-0.13°C	1.3°C	-	5%	0.18kPa
21:00 ☾	-3.3°C	-0.13°C	0.46°C	-	5%	0.15kPa
22:00 ☾	-3.7°C	-0.13°C	-0.14°C	-	5%	0.14kPa
23:00 ☾	-4.1°C	-0.17°C	-0.55°C	-	5%	0.13kPa
Sat, Apr 11 Sunrise 05:34 Sunset 20:44
24:00 ☾	-4.4°C	-0.17°C	-0.92°C	-	5%	0.13kPa
01:00 ☾	-4.6°C	-0.17°C	-1.2°C	-	3%	0.13kPa
02:00 ☾	-4.9°C	-0.17°C	-1.5°C	-	5%	0.12kPa
03:00 ☾	-5°C	-0.17°C	-1.6°C	-	5%	0.12kPa
04:00 ☾	-5.1°C	-0.17°C	-1.6°C	-	5%	0.13kPa
05:00 ☾	-5.3°C	-0.17°C	-1.6°C	-	5%	0.13kPa
06:00	-5.5°C	-0.18°C	-1.7°C	-	38%	0.13kPa
07:00	-5.6°C	-0.38°C	-1.5°C	-	96%	0.14kPa
08:00	-5.4°C	-0.47°C	-0.72°C	-	82%	0.17kPa
09:00	-5.1°C	-0.47°C	0.1°C	-	99%	0.2kPa
10:00	-3.7°C	-0.35°C	1°C	-	99%	0.19kPa
11:00	-2.4°C	-0.23°C	2°C	-	100%	0.19kPa
12:00	-1.1°C	-0.11°C	2.9°C	-	100%	0.19kPa
13:00	-1.2°C	-0.08°C	1.8°C	-	98%	0.14kPa
14:00	-1.3°C	-0.06°C	0.75°C	-	96%	0.09kPa
15:00	-1.6°C	-0.03°C	-0.31°C	-	94%	0.05kPa
16:00	-1.7°C	-0.05°C	-0.57°C	-	74%	0.05kPa
17:00	-1.9°C	-0.07°C	-0.83°C	-	55%	0.04kPa
18:00	-2°C	-0.09°C	-1.1°C	-	36%	0.04kPa
19:00	-2.3°C	-0.09°C	-1.3°C	-	31%	0.04kPa
20:00	-2.5°C	-0.09°C	-1.5°C	-	25%	0.04kPa
21:00 ☾	-2.7°C	-0.08°C	-1.7°C	-	19%	0.04kPa
22:00 ☾	-2.9°C	-0.09°C	-1.8°C	-	17%	0.04kPa
23:00 ☾	-3.1°C	-0.09°C	-1.8°C	-	15%	0.05kPa
Sun, Apr 12 Sunrise 05:29 Sunset 20:48
24:00 ☾	-3.3°C	-0.09°C	-1.9°C	-	14%	0.05kPa
01:00 ☾	-3°C	-0.11°C	-0.92°C	-	11%	0.08kPa
02:00 ☾	-2.9°C	-0.14°C	0.04°C	-	8%	0.12kPa
03:00 ☾	-2.7°C	-0.17°C	1°C	-	5%	0.16kPa

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

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