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

Utsjoki - Morning Frost - Finnish Lapland

Utsjoki, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions

Frost Probability

52%

Soil Temperature-2.5°C

Dew Point-2.2°C (low dew point)

Wind Speed5.5m/s (moderate winds)

Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

Next opportunity

Moderate Frost (radiative) at Sunrise

Utsjoki

Mon, Mar 16 · 05:45–08:00 · 2h window

Low confidence

27%

❄️Frost Probability73%

Soil Temperature: -2.9°C

Dew Point: -6.5°C (low dew point)

Wind Speed: 1.4m/s (calm conditions)

Cloud Cover: 5%

Moderate Frost (radiative)

Utsjoki

Mon, Mar 16 · 08:00–08:00

❄️Frost Probability:73%

Medium

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
Thu, Mar 12
06:00	✓	50%	6.4m/s
07:00	✓	48%	5.2m/s
08:00	✓	48%	4.6m/s
09:00	✕	48%	4.3m/s
10:00	✕	48%	4.8m/s
11:00	✕	48%	4.7m/s
12:00	✕	50%	4m/s
13:00	✕	50%	3.9m/s
14:00	✕	48%	4.4m/s
15:00	✕	50%	4.1m/s
16:00	✕	50%	3.8m/s
17:00	✕	50%	2.8m/s
18:00	✕	52%	2.6m/s
19:00	✕	52%	2.6m/s
20:00	✕	50%	3.7m/s
21:00	✕	50%	3.5m/s
22:00	✕	48%	4.3m/s
23:00	✕	49%	4.3m/s
Fri, Mar 13
24:00	✕	50%	4.2m/s
01:00	✕	52%	4.9m/s
02:00	✕	48%	5m/s
03:00	✕	52%	5.5m/s
04:00	✕	50%	6.1m/s
05:00	✓	50%	7.4m/s
06:00	✓	50%	8.9m/s
07:00	✓	52%	5m/s
08:00	✓	50%	6.6m/s
09:00	✕	52%	4.6m/s
10:00	✕	48%	4.7m/s
11:00	✕	46%	6m/s
12:00	✕	46%	7.2m/s
13:00	✕	46%	6.5m/s
14:00	✕	48%	4.8m/s
15:00	✕	46%	5.8m/s
16:00	✕	48%	5m/s
17:00	✕	48%	4.8m/s
18:00	✕	48%	4.7m/s
19:00	✕	48%	4.5m/s
20:00	✕	50%	3.9m/s
21:00	✕	50%	3.9m/s
22:00	✕	50%	3.9m/s
23:00	✕	50%	4.2m/s
Sat, Mar 14
24:00	✕	46%	4.6m/s
01:00	✕	46%	5.4m/s
02:00	✕	46%	5.6m/s
03:00	✕	46%	5.2m/s
04:00	✕	44%	6.1m/s
05:00	✓	44%	8.7m/s
06:00	✓	44%	10m/s
07:00	✓	44%	13m/s
08:00	✓	44%	12m/s
09:00	✕	48%	8.2m/s
10:00	✕	48%	9.5m/s
11:00	✕	44%	9.3m/s
12:00	✕	48%	9m/s
13:00	✕	66%	7.4m/s
14:00	✕	68%	5.5m/s
15:00	✕	68%	5.1m/s
16:00	✕	67%	4m/s
17:00	✕	65%	4.8m/s
18:00	✕	65%	5.5m/s
19:00	✕	67%	4.2m/s
20:00	✕	61%	5.1m/s
21:00	✕	57%	5.4m/s
22:00	✕	61%	5.4m/s
23:00	✕	65%	5.5m/s
Sun, Mar 15
24:00	✕	65%	5.6m/s
01:00	✕	65%	5.1m/s
02:00	✕	61%	5.4m/s
03:00	✕	47%	5.1m/s
04:00	✕	44%	6.8m/s
05:00	✓	54%	6.4m/s
06:00	✓	65%	6m/s
07:00	✓	67%	4.7m/s
08:00	✓	67%	4.7m/s
09:00	✕	59%	5m/s
10:00	✕	53%	5.2m/s
11:00	✕	52%	5.5m/s
12:00	✕	52%	4.8m/s
13:00	✕	54%	4.2m/s
14:00	✕	54%	3.5m/s
15:00	✕	54%	3.1m/s
16:00	✕	56%	2.7m/s
17:00	✕	52%	2.3m/s
18:00	✕	52%	2.1m/s
19:00	✕	52%	1.9m/s
20:00	✕	54%	1.7m/s
21:00	✕	54%	1.7m/s
22:00	✕	54%	1.7m/s
23:00	✕	52%	1.7m/s
Mon, Mar 16
24:00	✕	53%	1.7m/s
01:00	✕	60%	1.7m/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
Fri, Mar 13 Sunrise 06:44 Sunset 18:00
03:00 ☾	-2.2°C	-2.5°C	-1.2°C	-	100%	0.04kPa
04:00 ☾	-2.7°C	-2.4°C	-1°C	-	88%	0.07kPa
05:00 ☾	-3°C	-2.4°C	-0.55°C	-	96%	0.1kPa
06:00 ☾	-2.5°C	-2.4°C	-0.27°C	-	100%	0.09kPa
07:00	-2.3°C	-2.4°C	-1°C	-	100%	0.05kPa
08:00	-3.2°C	-2.4°C	-0.86°C	-	100%	0.09kPa
09:00	-2.5°C	-2.4°C	-1.2°C	-	100%	0.05kPa
10:00	-1.7°C	-2.4°C	-1.4°C	-	100%	0.02kPa
11:00	-0.8°C	-2.4°C	-0.59°C	-	100%	0.01kPa
12:00	-0.3°C	-2.3°C	-0.12°C	-	100%	0.01kPa
13:00	-0.2°C	-2.3°C	-0.01°C	-	100%	0.01kPa
14:00	0°C	-2.3°C	0.25°C	-	100%	0.01kPa
15:00	0.1°C	-2.3°C	0.24°C	-	100%	0.01kPa
16:00	0.3°C	-2.2°C	0.45°C	-	100%	0.01kPa
17:00	0.3°C	-2.2°C	0.53°C	-	100%	0.01kPa
18:00	0.3°C	-2.2°C	0.53°C	-	100%	0.01kPa
19:00 ☾	0.1°C	-2.1°C	0.35°C	-	100%	0.01kPa
20:00 ☾	0.1°C	-2.1°C	0.29°C	-	100%	0.01kPa
21:00 ☾	0.1°C	-2.1°C	0.29°C	-	100%	0.01kPa
22:00 ☾	0.1°C	-2°C	0.22°C	-	100%	0.01kPa
23:00 ☾	-0.1°C	-2°C	0.03°C	-	100%	0.01kPa
Sat, Mar 14 Sunrise 06:44 Sunset 18:00
24:00 ☾	-0.3°C	-2°C	-0.14°C	-	100%	0.01kPa
01:00 ☾	-0.4°C	-2°C	-0.15°C	-	100%	0.01kPa
02:00 ☾	-0.3°C	-1.9°C	-0.08°C	-	100%	0.01kPa
03:00 ☾	-0.1°C	-1.9°C	0.14°C	-	100%	0.01kPa
04:00 ☾	-0.1°C	-1.9°C	0.12°C	-	100%	0.01kPa
05:00 ☾	-0.1°C	-1.9°C	0.14°C	-	100%	0.01kPa
06:00 ☾	-0.1°C	-1.8°C	0.14°C	-	100%	0.01kPa
07:00	-0.2°C	-1.8°C	0.15°C	-	100%	0.02kPa
08:00	-0.3°C	-1.8°C	0.17°C	-	100%	0.02kPa
09:00	-0.2°C	-1.8°C	1.1°C	-	100%	0.06kPa
10:00	-0.4°C	-1.8°C	1.4°C	-	100%	0.08kPa
11:00	0.4°C	-1.8°C	1.3°C	-	100%	0.04kPa
12:00	0.2°C	-1.7°C	1.9°C	-	83%	0.08kPa
13:00	-0.3°C	-1.7°C	2.1°C	-	5%	0.11kPa
14:00	-1°C	-1.8°C	1.8°C	-	7%	0.13kPa
15:00	-1.9°C	-1.6°C	0.86°C	-	3%	0.12kPa
16:00	-3°C	-1.6°C	-0.54°C	-	3%	0.1kPa
17:00	-4.1°C	-1.7°C	-2°C	-	5%	0.07kPa
18:00	-4.8°C	-1.7°C	-3.1°C	-	5%	0.06kPa
19:00 ☾	-5.8°C	-1.7°C	-4.6°C	-	5%	0.04kPa
20:00 ☾	-5.4°C	-1.7°C	-4.4°C	-	6%	0.03kPa
21:00 ☾	-5.4°C	-1.7°C	-4.5°C	-	10%	0.03kPa
22:00 ☾	-5.3°C	-1.7°C	-4.3°C	-	6%	0.03kPa
23:00 ☾	-5.3°C	-1.7°C	-4°C	-	5%	0.04kPa
Sun, Mar 15 Sunrise 06:39 Sunset 18:04
24:00 ☾	-5.8°C	-1.8°C	-4.2°C	-	5%	0.05kPa
01:00 ☾	-7°C	-1.8°C	-5.8°C	-	5%	0.03kPa
02:00 ☾	-8.1°C	-1.8°C	-7.4°C	-	8%	0.02kPa
03:00 ☾	-8°C	-1.9°C	-7.5°C	-	60%	0.01kPa
04:00 ☾	-6.2°C	-2°C	-5.4°C	-	99%	0.02kPa
05:00 ☾	-5.8°C	-2°C	-4.6°C	-	46%	0.04kPa
06:00 ☾	-5.8°C	-2.1°C	-4.5°C	-	6%	0.04kPa
07:00	-6.8°C	-2.1°C	-5.5°C	-	5%	0.04kPa
08:00	-7°C	-2.2°C	-5.6°C	-	5%	0.04kPa
09:00	-5.9°C	-2.2°C	-4.3°C	-	37%	0.05kPa
10:00	-4.8°C	-2.2°C	-3.1°C	-	68%	0.06kPa
11:00	-3.6°C	-2.1°C	-1.9°C	-	100%	0.06kPa
12:00	-4.5°C	-2.2°C	-2.9°C	-	100%	0.06kPa
13:00	-5.3°C	-2.2°C	-3.8°C	-	100%	0.05kPa
14:00	-6.1°C	-2.2°C	-4.8°C	-	100%	0.04kPa
15:00	-6.3°C	-2.2°C	-5.1°C	-	100%	0.04kPa
16:00	-6.4°C	-2.3°C	-5.3°C	-	100%	0.03kPa
17:00	-6.6°C	-2.3°C	-5.6°C	-	100%	0.03kPa
18:00	-6.9°C	-2.3°C	-6°C	-	100%	0.03kPa
19:00 ☾	-7.2°C	-2.3°C	-6.5°C	-	100%	0.02kPa
20:00 ☾	-7.5°C	-2.4°C	-6.9°C	-	100%	0.02kPa
21:00 ☾	-8.1°C	-2.4°C	-7.4°C	-	100%	0.02kPa
22:00 ☾	-8.6°C	-2.5°C	-7.9°C	-	100%	0.02kPa
23:00 ☾	-9.1°C	-2.6°C	-8.4°C	-	100%	0.02kPa
Mon, Mar 16 Sunrise 06:35 Sunset 18:08
24:00 ☾	-9.4°C	-2.6°C	-8.5°C	-	79%	0.02kPa
01:00 ☾	-9.6°C	-2.7°C	-8.6°C	-	59%	0.03kPa
02:00 ☾	-9.9°C	-2.8°C	-8.6°C	-	38%	0.03kPa

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

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