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More Morning Frost in Finnish Lapland

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Rule Morning Frost

Kuusamo - Morning Frost - Finnish Lapland

Q: What conditions does Morning Frost look for?

Time Window: Sunrise -45m to +90m. Frost Probability: ≥ 60.0%. Wind Speed: ≤ 1.5m/s

Northern Ostrobothnia, Finland

Frost crystals on calm, cold mornings near sunrise

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No Morning Frost opportunities in the next 14 days

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Rule requirements (key thresholds)

Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Wind Speed · ≤ 1.5m/s

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)

Time Window 85% failing

Wind Speed 63% failing

Frost Probability 39% failing

Currently

Real-time conditions

Frost Probability

54%

Soil Temperature-0.4°C

Dew Point-12.3°C (low dew point)

Wind Speed2.3m/s (calm conditions)

Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

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	✕	67%	3.3m/s
09:00	✕	63%	4.1m/s
10:00	✕	54%	4.5m/s
11:00	✕	59%	4.4m/s
12:00	✕	64%	3.9m/s
13:00	✕	67%	3.4m/s
14:00	✕	67%	3.1m/s
15:00	✕	67%	3m/s
16:00	✕	80%	2.6m/s
17:00	✕	80%	2.5m/s
18:00	✕	80%	2.2m/s
19:00	✕	71%	0.96m/s
20:00	✕	57%	1.2m/s
21:00	✕	56%	1.2m/s
22:00	✕	59%	1.6m/s
23:00	✕	67%	1.5m/s
Thu, Apr 9
24:00	✕	65%	2m/s
01:00	✕	54%	2.6m/s
02:00	✕	54%	2.4m/s
03:00	✕	54%	2.2m/s
04:00	✕	54%	2.3m/s
05:00	✓	54%	2.1m/s
06:00	✓	54%	2.3m/s
07:00	✓	54%	2.7m/s
08:00	✕	52%	3m/s
09:00	✕	52%	3.2m/s
10:00	✕	63%	3.6m/s
11:00	✕	63%	3.9m/s
12:00	✕	63%	4.1m/s
13:00	✕	63%	4.1m/s
14:00	✕	63%	4.1m/s
15:00	✕	64%	3.9m/s
16:00	✕	63%	3.7m/s
17:00	✕	64%	3.5m/s
18:00	✕	70%	3.6m/s
19:00	✕	74%	3.3m/s
20:00	✕	58%	2.6m/s
21:00	✕	55%	2.8m/s
22:00	✕	61%	2.9m/s
23:00	✕	64%	2.9m/s
Fri, Apr 10
24:00	✕	75%	3m/s
01:00	✕	75%	3m/s
02:00	✕	67%	2.8m/s
03:00	✕	69%	2.5m/s
04:00	✓	69%	2.5m/s
05:00	✓	69%	2.5m/s
06:00	✓	69%	2.6m/s
07:00	✓	67%	2.8m/s
08:00	✕	75%	3.2m/s
09:00	✕	78%	3.4m/s
10:00	✕	78%	3.8m/s
11:00	✕	78%	3.7m/s
12:00	✕	70%	3.9m/s
13:00	✕	67%	3.9m/s
14:00	✕	67%	3.9m/s
15:00	✕	70%	3.8m/s
16:00	✕	70%	3.4m/s
17:00	✕	70%	2.9m/s
18:00	✕	72%	2.5m/s
19:00	✕	69%	2.1m/s
20:00	✕	69%	1.9m/s
21:00	✕	58%	2m/s
22:00	✕	58%	2m/s
23:00	✕	57%	1.6m/s
Sat, Apr 11
24:00	✕	67%	1.5m/s
01:00	✕	71%	1.4m/s
02:00	✕	71%	1.4m/s
03:00	✕	63%	1.4m/s
04:00	✓	57%	1.4m/s
05:00	✓	57%	1.3m/s
06:00	✓	56%	1.3m/s
07:00	✓	56%	1.2m/s
08:00	✕	67%	1.3m/s
09:00	✕	67%	1.3m/s
10:00	✕	67%	1.1m/s
11:00	✕	56%	0.87m/s
12:00	✕	58%	0.64m/s
13:00	✕	54%	0.75m/s
14:00	✕	52%	0.85m/s
15:00	✕	52%	0.95m/s
16:00	✕	52%	1m/s
17:00	✕	52%	1.1m/s
18:00	✕	52%	1.2m/s
19:00	✕	52%	1.2m/s
20:00	✕	56%	1.2m/s
21:00	✕	56%	1.2m/s
22:00	✕	57%	1.2m/s
23:00	✕	60%	1.1m/s
Sun, Apr 12
24:00	✕	63%	1.1m/s
01:00	✕	60%	1.2m/s
02:00	✕	71%	1.2m/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 05:47 Sunset 20:24
04:00 ☾	-12°C	-0.41°C	-11°C	-	100%	0.02kPa
05:00 ☾	-12°C	-0.43°C	-11°C	-	100%	0.02kPa
06:00	-11°C	-0.46°C	-10°C	-	100%	0.03kPa
07:00	-10°C	-0.53°C	-8.7°C	-	100%	0.04kPa
08:00	-8.9°C	-0.59°C	-6.6°C	-	100%	0.06kPa
09:00	-7.8°C	-0.62°C	-4.9°C	-	100%	0.08kPa
10:00	-7.1°C	-0.63°C	-3.4°C	-	100%	0.12kPa
11:00	-6.4°C	-0.63°C	-2.3°C	-	100%	0.14kPa
12:00	-5.7°C	-0.65°C	-1.3°C	-	100%	0.16kPa
13:00	-4.4°C	-0.65°C	-0.51°C	-	100%	0.15kPa
14:00	-3.3°C	-0.65°C	-0.06°C	-	87%	0.13kPa
15:00	-3.1°C	-0.61°C	0.06°C	-	74%	0.13kPa
16:00	-3.1°C	-0.61°C	0.29°C	-	88%	0.14kPa
17:00	-3.5°C	-0.61°C	0.35°C	-	67%	0.16kPa
18:00	-4.1°C	-0.63°C	0.07°C	-	37%	0.16kPa
19:00	-4.8°C	-0.63°C	-0.99°C	-	15%	0.14kPa
20:00	-6°C	-0.63°C	-3.5°C	-	56%	0.08kPa
21:00 ☾	-7.2°C	-0.63°C	-4.5°C	-	68%	0.08kPa
22:00 ☾	-8°C	-0.61°C	-4.9°C	-	77%	0.09kPa
23:00 ☾	-8.7°C	-0.61°C	-5.5°C	-	59%	0.09kPa
Fri, Apr 10 Sunrise 05:47 Sunset 20:24
24:00 ☾	-9.2°C	-0.62°C	-6°C	-	5%	0.09kPa
01:00 ☾	-9.5°C	-0.63°C	-6.4°C	-	5%	0.08kPa
02:00 ☾	-9.9°C	-0.64°C	-6.9°C	-	5%	0.08kPa
03:00 ☾	-10°C	-0.66°C	-7.9°C	-	5%	0.06kPa
04:00 ☾	-11°C	-0.68°C	-8.2°C	-	5%	0.06kPa
05:00 ☾	-11°C	-0.71°C	-8.7°C	-	5%	0.05kPa
06:00	-11°C	-0.77°C	-8.7°C	-	5%	0.06kPa
07:00	-9.7°C	-0.87°C	-7°C	-	5%	0.07kPa
08:00	-7.9°C	-0.93°C	-4.5°C	-	5%	0.1kPa
09:00	-6°C	-0.94°C	-2.3°C	-	5%	0.13kPa
10:00	-5.1°C	-0.94°C	-0.66°C	-	5%	0.16kPa
11:00	-3°C	-0.93°C	0.24°C	-	5%	0.13kPa
12:00	-2°C	-0.93°C	0.78°C	-	5%	0.12kPa
13:00	-1.2°C	-0.83°C	1.1°C	-	5%	0.1kPa
14:00	-0.8°C	-0.83°C	1.3°C	-	5%	0.1kPa
15:00	-0.8°C	-0.83°C	1.7°C	-	5%	0.11kPa
16:00	-0.7°C	-0.83°C	2°C	-	5%	0.12kPa
17:00	-0.6°C	-0.83°C	2°C	-	5%	0.12kPa
18:00	-0.8°C	-0.73°C	1.6°C	-	5%	0.11kPa
19:00	-1.6°C	-0.73°C	0.71°C	-	5%	0.1kPa
20:00	-3.9°C	-0.73°C	-2.2°C	-	5%	0.06kPa
21:00 ☾	-6.1°C	-0.73°C	-4.4°C	-	56%	0.05kPa
22:00 ☾	-6.6°C	-0.73°C	-4.2°C	-	58%	0.07kPa
23:00 ☾	-8.1°C	-0.77°C	-6.2°C	-	72%	0.05kPa
Sat, Apr 11 Sunrise 05:43 Sunset 20:27
24:00 ☾	-8.7°C	-0.77°C	-6.7°C	-	14%	0.05kPa
01:00 ☾	-9.2°C	-0.78°C	-7.2°C	-	5%	0.05kPa
02:00 ☾	-9.5°C	-0.85°C	-7.5°C	-	5%	0.05kPa
03:00 ☾	-9.5°C	-0.95°C	-7.7°C	-	33%	0.05kPa
04:00 ☾	-9.7°C	-1.1°C	-7.9°C	-	63%	0.04kPa
05:00 ☾	-9.5°C	-1.2°C	-7.8°C	-	80%	0.04kPa
06:00	-9.2°C	-1.3°C	-7.5°C	-	100%	0.04kPa
07:00	-7.6°C	-1.4°C	-5.6°C	-	100%	0.06kPa
08:00	-5.6°C	-1.4°C	-2.3°C	-	100%	0.11kPa
09:00	-4.3°C	-1.4°C	-0.1°C	-	100%	0.16kPa
10:00	-2.3°C	-1.2°C	0.89°C	-	97%	0.13kPa
11:00	-0.3°C	-1°C	1.9°C	-	93%	0.1kPa
12:00	1.6°C	-0.81°C	2.9°C	-	90%	0.06kPa
13:00	0.2°C	-0.78°C	1.2°C	-	93%	0.05kPa
14:00	-1.3°C	-0.76°C	-0.58°C	-	97%	0.03kPa
15:00	-2.8°C	-0.73°C	-2.3°C	-	100%	0.02kPa
16:00	-3.4°C	-0.72°C	-2.8°C	-	100%	0.02kPa
17:00	-4°C	-0.71°C	-3.2°C	-	99%	0.03kPa
18:00	-4.6°C	-0.7°C	-3.7°C	-	99%	0.03kPa
19:00	-4.8°C	-0.76°C	-3.8°C	-	93%	0.03kPa
20:00	-5°C	-0.82°C	-4°C	-	87%	0.03kPa
21:00 ☾	-5.2°C	-0.87°C	-4.1°C	-	81%	0.04kPa
22:00 ☾	-5.6°C	-1°C	-4.4°C	-	64%	0.04kPa
23:00 ☾	-5.9°C	-1.2°C	-4.6°C	-	46%	0.04kPa
Sun, Apr 12 Sunrise 05:39 Sunset 20:31
24:00 ☾	-6.3°C	-1.3°C	-4.9°C	-	29%	0.04kPa
01:00 ☾	-5.2°C	-1.4°C	-2.8°C	-	42%	0.08kPa
02:00 ☾	-4.2°C	-1.5°C	-0.69°C	-	55%	0.13kPa
03:00 ☾	-3.3°C	-1.5°C	1.4°C	-	67%	0.2kPa

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

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