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

Kilpisjärvi - Morning Frost - Finnish Lapland

Kilpisjärvi, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions

Frost Probability

54%

Soil Temperature-3.0°C

Dew Point-9.9°C (low dew point)

Wind Speed1.6m/s (calm conditions)

Cloud Cover91%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

Next opportunity

Moderate Frost (radiative) at Sunrise

Kilpisjärvi

Thu, Apr 16 · 06:00–07:00 · 1h window

Low confidence

34%

❄️Frost Probability73%

Soil Temperature: -2.3°C

Dew Point: -2.8°C (low dew point)

Wind Speed: 1.4m/s (calm conditions)

Cloud Cover: 6%

Light Frost

Kilpisjärvi

Thu, Apr 16 · 07:00–07:05

❄️Frost Probability:65%

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 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
Wed, Apr 8
04:00	✕	52%	2.3m/s
05:00	✓	52%	2.3m/s
06:00	✓	50%	2.9m/s
07:00	✓	50%	3.6m/s
08:00	✕	48%	4.6m/s
09:00	✕	48%	5.4m/s
10:00	✕	48%	5.4m/s
11:00	✕	46%	6.2m/s
12:00	✕	50%	6.3m/s
13:00	✕	50%	7.3m/s
14:00	✕	50%	8m/s
15:00	✕	50%	9m/s
16:00	✕	50%	9.5m/s
17:00	✕	50%	9.3m/s
18:00	✕	50%	8.3m/s
19:00	✕	50%	7.3m/s
20:00	✕	50%	6.1m/s
21:00	✕	54%	3.5m/s
22:00	✕	54%	1.6m/s
23:00	✕	54%	1.1m/s
Thu, Apr 9
24:00	✕	56%	0.73m/s
01:00	✕	55%	1.3m/s
02:00	✕	58%	1.4m/s
03:00	✕	53%	1.8m/s
04:00	✕	54%	1.6m/s
05:00	✓	52%	1.8m/s
06:00	✓	52%	2.3m/s
07:00	✓	52%	2.5m/s
08:00	✕	52%	2.5m/s
09:00	✕	52%	2.7m/s
10:00	✕	52%	2.6m/s
11:00	✕	52%	2.7m/s
12:00	✕	51%	2.9m/s
13:00	✕	56%	2.8m/s
14:00	✕	53%	2.6m/s
15:00	✕	54%	2.8m/s
16:00	✕	56%	2.8m/s
17:00	✕	59%	2.7m/s
18:00	✕	57%	3m/s
19:00	✕	56%	2.7m/s
20:00	✕	52%	2.6m/s
21:00	✕	50%	3.2m/s
22:00	✕	50%	4m/s
23:00	✕	50%	3.8m/s
Fri, Apr 10
24:00	✕	48%	4.4m/s
01:00	✕	52%	4.9m/s
02:00	✕	48%	4.7m/s
03:00	✕	48%	4.9m/s
04:00	✕	48%	4.8m/s
05:00	✓	48%	4.2m/s
06:00	✓	50%	4.1m/s
07:00	✓	50%	3.7m/s
08:00	✕	50%	3.5m/s
09:00	✕	50%	3.4m/s
10:00	✕	50%	2.9m/s
11:00	✕	52%	2.1m/s
12:00	✕	54%	1.4m/s
13:00	✕	54%	1.3m/s
14:00	✕	55%	1.5m/s
15:00	✕	55%	1.5m/s
16:00	✕	54%	1.2m/s
17:00	✕	58%	1m/s
18:00	✕	58%	1.1m/s
19:00	✕	61%	1m/s
20:00	✕	58%	1m/s
21:00	✕	58%	1m/s
22:00	✕	60%	0.72m/s
23:00	✕	54%	0.9m/s
Sat, Apr 11
24:00	✕	54%	0.88m/s
01:00	✕	54%	0.96m/s
02:00	✕	54%	1.4m/s
03:00	✕	54%	1.6m/s
04:00	✕	54%	1.2m/s
05:00	✓	54%	0.91m/s
06:00	✓	54%	0.92m/s
07:00	✓	56%	0.43m/s
08:00	✕	54%	1.5m/s
09:00	✕	54%	1.1m/s
10:00	✕	54%	1.3m/s
11:00	✕	55%	1.6m/s
12:00	✕	57%	1.9m/s
13:00	✕	56%	1.7m/s
14:00	✕	58%	1.5m/s
15:00	✕	61%	1.3m/s
16:00	✕	61%	1.3m/s
17:00	✕	61%	1.4m/s
18:00	✕	61%	1.4m/s
19:00	✕	56%	2.3m/s
20:00	✕	51%	3.2m/s
21:00	✕	50%	4.1m/s
22:00	✕	51%	3.7m/s
23:00	✕	54%	3.3m/s
Sun, Apr 12
24:00	✕	61%	2.9m/s
01:00	✕	61%	2.9m/s
02:00	✕	57%	2.9m/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
Thu, Apr 9 Sunrise 06:07 Sunset 21:11
04:00 ☾	-9.9°C	-3°C	-9.9°C	-	91%	0kPa
05:00 ☾	-9.1°C	-3°C	-9.1°C	-	98%	0kPa
06:00 ☾	-6.9°C	-3°C	-6.9°C	-	100%	0kPa
07:00	-6.2°C	-3°C	-6.2°C	-	100%	0kPa
08:00	-5.5°C	-3°C	-5.5°C	-	99%	0kPa
09:00	-5.1°C	-3°C	-4.8°C	-	86%	0.01kPa
10:00	-4.5°C	-3°C	-4.1°C	-	90%	0.01kPa
11:00	-3.8°C	-3°C	-3.3°C	-	97%	0.02kPa
12:00	-3.1°C	-2.9°C	-2.5°C	-	61%	0.02kPa
13:00	-2.7°C	-2.9°C	-2°C	-	56%	0.03kPa
14:00	-2.3°C	-2.9°C	-1.6°C	-	68%	0.03kPa
15:00	-2.2°C	-2.9°C	-1.3°C	-	54%	0.03kPa
16:00	-2.2°C	-2.9°C	-1.2°C	-	45%	0.04kPa
17:00	-2.3°C	-2.9°C	-1.4°C	-	36%	0.04kPa
18:00	-2.6°C	-2.8°C	-1.9°C	-	38%	0.03kPa
19:00	-3.6°C	-2.8°C	-3.1°C	-	53%	0.02kPa
20:00	-3.8°C	-2.8°C	-3.4°C	-	84%	0.01kPa
21:00	-3.3°C	-2.8°C	-2.8°C	-	92%	0.02kPa
22:00 ☾	-3°C	-2.8°C	-2°C	-	98%	0.04kPa
23:00 ☾	-2.8°C	-2.8°C	-1.8°C	-	97%	0.04kPa
Fri, Apr 10 Sunrise 06:07 Sunset 21:11
24:00 ☾	-2.6°C	-2.8°C	-1.6°C	-	100%	0.04kPa
01:00 ☾	-2.4°C	-2.8°C	-1.3°C	-	100%	0.04kPa
02:00 ☾	-2.2°C	-2.7°C	-1.3°C	-	100%	0.03kPa
03:00 ☾	-2°C	-2.7°C	-1.3°C	-	100%	0.03kPa
04:00 ☾	-2°C	-2.7°C	-1.5°C	-	100%	0.02kPa
05:00 ☾	-2.3°C	-2.7°C	-1.8°C	-	100%	0.02kPa
06:00 ☾	-2.9°C	-2.7°C	-2.4°C	-	100%	0.02kPa
07:00	-3.3°C	-2.6°C	-3°C	-	100%	0.01kPa
08:00	-3.7°C	-2.6°C	-3.2°C	-	100%	0.02kPa
09:00	-3.8°C	-2.6°C	-3.2°C	-	92%	0.02kPa
10:00	-3.6°C	-2.6°C	-3°C	-	89%	0.02kPa
11:00	-3.1°C	-2.6°C	-2.5°C	-	90%	0.02kPa
12:00	-2.9°C	-2.6°C	-2.1°C	-	91%	0.03kPa
13:00	-2.6°C	-2.5°C	-1.8°C	-	85%	0.03kPa
14:00	-2.2°C	-2.5°C	-1.5°C	-	80%	0.03kPa
15:00	-1.9°C	-2.5°C	-1.1°C	-	75%	0.03kPa
16:00	-1.6°C	-2.5°C	-0.85°C	-	85%	0.03kPa
17:00	-1.6°C	-2.4°C	-0.69°C	-	59%	0.04kPa
18:00	-1.9°C	-2.4°C	-1.1°C	-	42%	0.03kPa
19:00	-2.9°C	-2.3°C	-2.1°C	-	40%	0.03kPa
20:00	-4.4°C	-2.3°C	-3.8°C	-	41%	0.02kPa
21:00	-5.6°C	-2.3°C	-5.3°C	-	43%	0.01kPa
22:00 ☾	-6.4°C	-2.3°C	-6.2°C	-	54%	0kPa
23:00 ☾	-6.6°C	-2.4°C	-6.5°C	-	82%	0kPa
Sat, Apr 11 Sunrise 06:03 Sunset 21:15
24:00 ☾	-6.8°C	-2.4°C	-6.7°C	-	95%	0kPa
01:00 ☾	-6.6°C	-2.5°C	-6.5°C	-	99%	0kPa
02:00 ☾	-5.2°C	-2.5°C	-5°C	-	100%	0kPa
03:00 ☾	-4.9°C	-2.5°C	-4.9°C	-	100%	0kPa
04:00 ☾	-4.8°C	-2.5°C	-4.8°C	-	100%	0kPa
05:00 ☾	-4.7°C	-2.5°C	-4.5°C	-	100%	0.01kPa
06:00	-4.7°C	-2.5°C	-4.4°C	-	100%	0.01kPa
07:00	-4.6°C	-2.5°C	-4.2°C	-	100%	0.01kPa
08:00	-4.6°C	-2.5°C	-3.7°C	-	100%	0.03kPa
09:00	-4°C	-2.5°C	-3.4°C	-	100%	0.02kPa
10:00	-3.6°C	-2.6°C	-2.9°C	-	89%	0.03kPa
11:00	-3.2°C	-2.8°C	-2.3°C	-	77%	0.03kPa
12:00	-2.9°C	-2.9°C	-1.8°C	-	66%	0.04kPa
13:00	-4.6°C	-2.9°C	-3.8°C	-	54%	0.03kPa
14:00	-6.3°C	-2.9°C	-5.8°C	-	42%	0.02kPa
15:00	-8.1°C	-2.9°C	-7.8°C	-	29%	0.01kPa
16:00	-8.9°C	-3°C	-8.6°C	-	33%	0.01kPa
17:00	-9.8°C	-3°C	-9.4°C	-	36%	0.01kPa
18:00	-11°C	-3.1°C	-10°C	-	39%	0.01kPa
19:00	-8.4°C	-3.1°C	-8°C	-	59%	0.01kPa
20:00	-6.3°C	-3.2°C	-5.8°C	-	80%	0.02kPa
21:00	-4.2°C	-3.2°C	-3.6°C	-	100%	0.02kPa
22:00 ☾	-5.5°C	-3.2°C	-4.9°C	-	72%	0.02kPa
23:00 ☾	-6.7°C	-3.3°C	-6.2°C	-	43%	0.02kPa
Sun, Apr 12 Sunrise 05:58 Sunset 21:19
24:00 ☾	-8°C	-3.3°C	-7.5°C	-	15%	0.01kPa
01:00 ☾	-7.7°C	-3.4°C	-7.2°C	-	21%	0.01kPa
02:00 ☾	-7.3°C	-3.4°C	-6.9°C	-	28%	0.01kPa
03:00 ☾	-6.9°C	-3.5°C	-6.6°C	-	34%	0.01kPa

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

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