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

Enontekiö - Morning Frost - Finnish Lapland

Enontekiö, Lapland, Finland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions

Frost Probability

46%

Soil Temperature-2.5°C

Dew Point-5.1°C (low dew point)

Wind Speed7.1m/s (moderate winds)

Cloud Cover98%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

Next opportunity

Light Frost at Sunrise

Enontekiö

Fri, Apr 17 · 04:39–06:54 · 2h window

Low confidence

23%

❄️Frost Probability65-66%

Soil Temperature: 0.4°C

Dew Point: -2.8°C (low dew point)

Wind Speed: 0.6m/s (calm conditions)

Cloud Cover: 91%

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	✕	53%	1.7m/s
09:00	✕	56%	2.5m/s
10:00	✕	65%	3.9m/s
11:00	✕	75%	5m/s
12:00	✕	61%	5.8m/s
13:00	✕	76%	6.7m/s
14:00	✕	72%	7.6m/s
15:00	✕	68%	7.5m/s
16:00	✕	50%	8m/s
17:00	✕	50%	8.2m/s
18:00	✕	50%	9.1m/s
19:00	✕	50%	9.4m/s
20:00	✕	50%	8.9m/s
21:00	✕	50%	8.7m/s
22:00	✕	50%	8.7m/s
23:00	✕	50%	9m/s
Thu, Apr 9
24:00	✕	50%	8.6m/s
01:00	✕	50%	8.2m/s
02:00	✕	50%	7.9m/s
03:00	✕	46%	7.7m/s
04:00	✕	46%	7.1m/s
05:00	✓	46%	6.4m/s
06:00	✓	46%	6.5m/s
07:00	✓	46%	6.1m/s
08:00	✕	46%	6.6m/s
09:00	✕	50%	7.2m/s
10:00	✕	50%	7.6m/s
11:00	✕	50%	7.9m/s
12:00	✕	50%	8.1m/s
13:00	✕	50%	8m/s
14:00	✕	50%	7.9m/s
15:00	✕	50%	7.8m/s
16:00	✕	50%	8.2m/s
17:00	✕	50%	7.4m/s
18:00	✕	46%	7.2m/s
19:00	✕	44%	7m/s
20:00	✕	44%	6.9m/s
21:00	✕	44%	6.9m/s
22:00	✕	44%	7.1m/s
23:00	✕	44%	7.1m/s
Fri, Apr 10
24:00	✕	44%	6.8m/s
01:00	✕	44%	7m/s
02:00	✕	44%	6.9m/s
03:00	✕	49%	6.9m/s
04:00	✕	63%	6.5m/s
05:00	✓	63%	6.1m/s
06:00	✓	63%	6.1m/s
07:00	✓	63%	6.4m/s
08:00	✕	65%	6.7m/s
09:00	✕	65%	7.2m/s
10:00	✕	65%	7.8m/s
11:00	✕	68%	8.3m/s
12:00	✕	65%	8.6m/s
13:00	✕	65%	8.7m/s
14:00	✕	63%	8.7m/s
15:00	✕	63%	8.8m/s
16:00	✕	59%	8.8m/s
17:00	✕	63%	8.5m/s
18:00	✕	63%	8.2m/s
19:00	✕	59%	7.5m/s
20:00	✕	63%	6.7m/s
21:00	✕	65%	5.6m/s
22:00	✕	65%	5m/s
23:00	✕	61%	4.5m/s
Sat, Apr 11
24:00	✕	63%	4.1m/s
01:00	✕	63%	4.1m/s
02:00	✕	59%	4m/s
03:00	✕	55%	3.9m/s
04:00	✕	55%	3.7m/s
05:00	✓	55%	3.8m/s
06:00	✓	57%	4.1m/s
07:00	✓	61%	4.1m/s
08:00	✕	53%	4.4m/s
09:00	✕	52%	4.7m/s
10:00	✕	50%	4.3m/s
11:00	✕	53%	4m/s
12:00	✕	56%	3.6m/s
13:00	✕	53%	3.9m/s
14:00	✕	50%	4.3m/s
15:00	✕	46%	4.6m/s
16:00	✕	46%	4.6m/s
17:00	✕	47%	4.5m/s
18:00	✕	47%	4.5m/s
19:00	✕	47%	4.8m/s
20:00	✕	50%	5.1m/s
21:00	✕	50%	5.4m/s
22:00	✕	51%	5.1m/s
23:00	✕	50%	4.8m/s
Sun, Apr 12
24:00	✕	57%	4.5m/s
01:00	✕	61%	4.9m/s
02:00	✕	61%	5.2m/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 05:59 Sunset 20:56
04:00 ☾	-5.1°C	-2.5°C	-4.3°C	-	98%	0.02kPa
05:00 ☾	-5°C	-2.6°C	-4.3°C	-	95%	0.02kPa
06:00	-4.8°C	-2.6°C	-4.1°C	-	84%	0.02kPa
07:00	-4.8°C	-2.6°C	-4.1°C	-	89%	0.02kPa
08:00	-4.3°C	-2.6°C	-3.5°C	-	92%	0.03kPa
09:00	-4.1°C	-2.6°C	-3°C	-	100%	0.04kPa
10:00	-4°C	-2.6°C	-2.7°C	-	100%	0.05kPa
11:00	-3.6°C	-2.6°C	-2°C	-	99%	0.06kPa
12:00	-3.1°C	-2.5°C	-1.3°C	-	93%	0.07kPa
13:00	-2.2°C	-2.4°C	-0.61°C	-	95%	0.06kPa
14:00	-1.4°C	-2.4°C	-0.06°C	-	100%	0.06kPa
15:00	-1.2°C	-2.2°C	-0.04°C	-	100%	0.05kPa
16:00	-1.7°C	-2.1°C	0.09°C	-	100%	0.08kPa
17:00	-1.3°C	-2.1°C	-0.05°C	-	100%	0.05kPa
18:00	-1°C	-2°C	-0.03°C	-	100%	0.04kPa
19:00	-0.7°C	-1.9°C	0.01°C	-	100%	0.03kPa
20:00	-0.6°C	-1.9°C	-0.03°C	-	100%	0.03kPa
21:00 ☾	-0.5°C	-1.8°C	-0.07°C	-	100%	0.02kPa
22:00 ☾	-0.5°C	-1.8°C	-0.03°C	-	100%	0.02kPa
23:00 ☾	-0.7°C	-1.8°C	-0.02°C	-	100%	0.03kPa
Fri, Apr 10 Sunrise 05:59 Sunset 20:56
24:00 ☾	-1°C	-1.7°C	-0.23°C	-	100%	0.03kPa
01:00 ☾	-1.9°C	-1.7°C	-1.1°C	-	100%	0.03kPa
02:00 ☾	-3°C	-1.7°C	-2°C	-	100%	0.04kPa
03:00 ☾	-4°C	-1.7°C	-2.8°C	-	62%	0.04kPa
04:00 ☾	-5.5°C	-1.7°C	-4.2°C	-	7%	0.04kPa
05:00 ☾	-6.4°C	-1.7°C	-5°C	-	6%	0.04kPa
06:00	-6.8°C	-1.8°C	-5.3°C	-	5%	0.05kPa
07:00	-6.9°C	-2°C	-5.1°C	-	5%	0.06kPa
08:00	-6.6°C	-2.1°C	-4.4°C	-	5%	0.07kPa
09:00	-5.8°C	-2.1°C	-3.5°C	-	5%	0.08kPa
10:00	-4.8°C	-2.1°C	-2.2°C	-	5%	0.09kPa
11:00	-3.6°C	-2.1°C	-0.86°C	-	5%	0.11kPa
12:00	-2.6°C	-2°C	-0.02°C	-	5%	0.1kPa
13:00	-1.7°C	-2°C	0.62°C	-	5%	0.1kPa
14:00	-1.1°C	-1.9°C	1°C	-	5%	0.09kPa
15:00	-0.7°C	-1.8°C	1.4°C	-	5%	0.1kPa
16:00	-0.5°C	-1.6°C	1.6°C	-	15%	0.1kPa
17:00	-0.6°C	-1.4°C	1.6°C	-	6%	0.1kPa
18:00	-0.7°C	-1.4°C	1.5°C	-	7%	0.1kPa
19:00	-1°C	-1.2°C	1°C	-	10%	0.09kPa
20:00	-1.5°C	-1.2°C	0.26°C	-	7%	0.08kPa
21:00	-2.3°C	-1.2°C	-0.84°C	-	5%	0.06kPa
22:00 ☾	-3.1°C	-1.2°C	-2°C	-	5%	0.04kPa
23:00 ☾	-4°C	-1.2°C	-3.1°C	-	6%	0.03kPa
Sat, Apr 11 Sunrise 05:55 Sunset 21:00
24:00 ☾	-4.7°C	-1.3°C	-3.8°C	-	7%	0.03kPa
01:00 ☾	-4.9°C	-1.3°C	-4.2°C	-	10%	0.02kPa
02:00 ☾	-5.2°C	-1.5°C	-4.6°C	-	15%	0.02kPa
03:00 ☾	-5.5°C	-1.6°C	-5°C	-	26%	0.01kPa
04:00 ☾	-5.9°C	-1.8°C	-5.5°C	-	27%	0.01kPa
05:00 ☾	-6.3°C	-1.9°C	-5.8°C	-	38%	0.01kPa
06:00	-6.6°C	-2.1°C	-6°C	-	37%	0.02kPa
07:00	-6.5°C	-2.3°C	-5.7°C	-	20%	0.02kPa
08:00	-5.9°C	-2.4°C	-4.7°C	-	63%	0.04kPa
09:00	-5.3°C	-2.5°C	-3.4°C	-	100%	0.06kPa
10:00	-3.8°C	-1.9°C	-1.7°C	-	89%	0.08kPa
11:00	-2.4°C	-1.4°C	0.05°C	-	78%	0.1kPa
12:00	-0.9°C	-0.91°C	1.8°C	-	66%	0.12kPa
13:00	-1.1°C	-0.88°C	0.95°C	-	74%	0.09kPa
14:00	-1.3°C	-0.86°C	0.12°C	-	81%	0.06kPa
15:00	-1.5°C	-0.83°C	-0.71°C	-	89%	0.03kPa
16:00	-1.9°C	-0.82°C	-1.1°C	-	81%	0.03kPa
17:00	-2.2°C	-0.81°C	-1.4°C	-	73%	0.03kPa
18:00	-2.5°C	-0.81°C	-1.8°C	-	65%	0.03kPa
19:00	-2.7°C	-0.85°C	-1.8°C	-	76%	0.03kPa
20:00	-2.9°C	-0.89°C	-1.8°C	-	88%	0.04kPa
21:00	-3°C	-0.93°C	-1.8°C	-	99%	0.05kPa
22:00 ☾	-3.2°C	-0.99°C	-2.1°C	-	73%	0.04kPa
23:00 ☾	-3.4°C	-1°C	-2.5°C	-	48%	0.03kPa
Sun, Apr 12 Sunrise 05:50 Sunset 21:04
24:00 ☾	-3.5°C	-1.1°C	-2.8°C	-	22%	0.03kPa
01:00 ☾	-4.1°C	-1.2°C	-2.3°C	-	17%	0.06kPa
02:00 ☾	-4.7°C	-1.3°C	-1.9°C	-	11%	0.1kPa
03:00 ☾	-5.4°C	-1.4°C	-1.4°C	-	5%	0.14kPa

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

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