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No opportunity windows are predicted in the next 10 days. Conditions can change quickly, so check back for updates.

More Morning Frost in Southern Finland

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Rule Morning Frost

Teijo - Morning Frost - Southern Finland

Q: What conditions does Morning Frost look for?

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

Matildedal, Southwest Finland, Finland

Frost crystals on calm, cold mornings near sunrise

No opportunities right now

Here’s what usually blocks matches

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)

Wind Speed 90% failing

Time Window 88% failing

Frost Probability 56% failing

Currently

Real-time conditions

Frost Probability

45%

Soil Temperature3.2°C

Dew Point-7.0°C (low dew point)

Wind Speed2.1m/s (calm conditions)

Cloud Cover0%

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 conditions that create Southern Finland's dramatic frost photography opportunities. From November through March, the region's lakes, forests, and wetlands transform under hoar frost and ice formations, with temperatures regularly dropping to -15°C or colder.

What makes Southern Finland special for frost photography:

Lake ice formations - Vesijärvi and Saimaa develop intricate ice patterns and frozen shoreline details
Torronsuo's frozen bog - The region's largest raised bog becomes an otherworldly landscape of frosted sphagnum and ice-covered pools
Nuuksio forest frost - Hoar frost on birch trees and frozen forest streams create intimate woodland scenes
Accessible winter locations - All major frost photography sites within 2 hours of Helsinki

Peak frost conditions occur during stable high-pressure systems when clear nights drop temperatures well below freezing while daytime sun creates backlit opportunities. Nuuksio's mixed forests develop heavy hoar frost on birch branches, transforming familiar trails into sparkling winter scenes. Torronsuo National Park's boardwalks traverse frosted bog landscapes where every sedge and shrub carries ice crystals. The region's thousands of lakes create endless shoreline compositions—ice formations along reed beds, frozen spray patterns, and geometric crack patterns in smooth ice. The forecast identifies calm, clear nights with appropriate temperature drops, then tracks morning visibility to ensure you can photograph the frost before midday sun melts the formations.

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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
Wed, Apr 8
07:00	✓	48%	4.4m/s
08:00	✓	63%	4.3m/s
09:00	✕	48%	4.4m/s
10:00	✕	53%	5m/s
11:00	✕	57%	5.1m/s
12:00	✕	50%	5.1m/s
13:00	✕	48%	5.1m/s
14:00	✕	44%	5.3m/s
15:00	✕	44%	5.3m/s
16:00	✕	44%	5m/s
17:00	✕	44%	5m/s
18:00	✕	44%	4.2m/s
19:00	✕	46%	4.1m/s
20:00	✕	50%	3.6m/s
21:00	✕	50%	3.1m/s
22:00	✕	54%	2.8m/s
23:00	✕	52%	3.1m/s
Thu, Apr 9
24:00	✕	54%	2.6m/s
01:00	✕	50%	2.6m/s
02:00	✕	45%	2.5m/s
03:00	✕	45%	2.4m/s
04:00	✕	45%	2.1m/s
05:00	✓	45%	2.1m/s
06:00	✓	52%	2m/s
07:00	✓	52%	2.1m/s
08:00	✕	59%	2.9m/s
09:00	✕	74%	3.3m/s
10:00	✕	70%	3.5m/s
11:00	✕	70%	3.5m/s
12:00	✕	59%	3.6m/s
13:00	✕	49%	3.5m/s
14:00	✕	48%	3.3m/s
15:00	✕	33%	3.3m/s
16:00	✕	35%	2.7m/s
17:00	✕	28%	2.1m/s
18:00	✕	35%	1.6m/s
19:00	✕	34%	2.3m/s
20:00	✕	39%	2.3m/s
21:00	✕	34%	0.49m/s
22:00	✕	34%	0.74m/s
23:00	✕	32%	1.4m/s
Fri, Apr 10
24:00	✕	44%	1.6m/s
01:00	✕	47%	1.8m/s
02:00	✕	46%	2m/s
03:00	✕	46%	2m/s
04:00	✕	46%	2m/s
05:00	✓	46%	1.9m/s
06:00	✓	61%	1.8m/s
07:00	✓	61%	1.9m/s
08:00	✕	61%	2.1m/s
09:00	✕	61%	2.5m/s
10:00	✕	57%	2.5m/s
11:00	✕	58%	2.6m/s
12:00	✕	72%	2.6m/s
13:00	✕	72%	2.5m/s
14:00	✕	54%	2.3m/s
15:00	✕	39%	2.5m/s
16:00	✕	37%	2.8m/s
17:00	✕	30%	2.7m/s
18:00	✕	26%	2.6m/s
19:00	✕	33%	2m/s
20:00	✕	35%	1.6m/s
21:00	✕	37%	1.2m/s
22:00	✕	39%	0.63m/s
23:00	✕	41%	0.93m/s
Sat, Apr 11
24:00	✕	42%	1.1m/s
01:00	✕	52%	1.6m/s
02:00	✕	61%	1.9m/s
03:00	✕	61%	1.9m/s
04:00	✕	61%	1.9m/s
05:00	✓	61%	2m/s
06:00	✓	61%	2.2m/s
07:00	✓	61%	2.2m/s
08:00	✕	61%	2.5m/s
09:00	✕	55%	3.2m/s
10:00	✕	74%	3.6m/s
11:00	✕	80%	4m/s
12:00	✕	76%	4.4m/s
13:00	✕	74%	4.2m/s
14:00	✕	70%	3.9m/s
15:00	✕	59%	3.7m/s
16:00	✕	70%	3.7m/s
17:00	✕	66%	3.8m/s
18:00	✕	78%	3.8m/s
19:00	✕	70%	3.7m/s
20:00	✕	67%	3.5m/s
21:00	✕	67%	3.4m/s
22:00	✕	67%	3.4m/s
23:00	✕	67%	3.5m/s
Sun, Apr 12
24:00	✕	67%	3.5m/s
01:00	✕	67%	3.6m/s
02:00	✕	67%	3.7m/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
Thu, Apr 9 Sunrise 06:29 Sunset 20:31
05:00 ☾	-7°C	3.2°C	-1.8°C	-	0%	0.17kPa
06:00 ☾	-6.9°C	3°C	-2°C	-	4%	0.16kPa
07:00	-6.9°C	2.6°C	-2°C	-	5%	0.16kPa
08:00	-7.6°C	2.1°C	-1°C	-	5%	0.22kPa
09:00	-8.8°C	2°C	0.5°C	-	6%	0.32kPa
10:00	-10°C	2°C	2.1°C	-	5%	0.43kPa
11:00	-11°C	2°C	3.7°C	-	5%	0.53kPa
12:00	-12°C	2°C	5.1°C	-	16%	0.63kPa
13:00	-12°C	2°C	6.3°C	-	77%	0.71kPa
14:00	-12°C	2°C	6.9°C	-	100%	0.75kPa
15:00	-11°C	2.1°C	7.1°C	-	100%	0.75kPa
16:00	-11°C	2.8°C	7°C	-	100%	0.73kPa
17:00	-10°C	3.5°C	7°C	-	97%	0.71kPa
18:00	-8.8°C	4.1°C	6.4°C	-	38%	0.65kPa
19:00	-5.8°C	4.2°C	4.6°C	-	69%	0.45kPa
20:00	-4.8°C	3.9°C	1.6°C	-	100%	0.26kPa
21:00 ☾	-5°C	3.5°C	0.03°C	-	100%	0.19kPa
22:00 ☾	-5.4°C	3.1°C	-0.33°C	-	100%	0.19kPa
23:00 ☾	-5.8°C	3.1°C	-0.42°C	-	100%	0.2kPa
Fri, Apr 10 Sunrise 06:29 Sunset 20:31
24:00 ☾	-6.3°C	3°C	-0.43°C	-	100%	0.21kPa
01:00 ☾	-6.7°C	2.9°C	-0.52°C	-	66%	0.22kPa
02:00 ☾	-7°C	2.9°C	-0.72°C	-	82%	0.22kPa
03:00 ☾	-7.1°C	2.8°C	-0.9°C	-	84%	0.21kPa
04:00 ☾	-7.1°C	2.5°C	-0.95°C	-	100%	0.21kPa
05:00 ☾	-7°C	2.1°C	-0.91°C	-	100%	0.21kPa
06:00 ☾	-7.1°C	1.8°C	-0.98°C	-	100%	0.21kPa
07:00	-7.1°C	1.4°C	-0.75°C	-	100%	0.22kPa
08:00	-7.2°C	1.2°C	0.27°C	-	100%	0.27kPa
09:00	-8°C	1.2°C	1.6°C	-	100%	0.35kPa
10:00	-7.8°C	1.2°C	3.1°C	-	95%	0.43kPa
11:00	-7.4°C	1.3°C	4.3°C	-	65%	0.48kPa
12:00	-6.8°C	1.3°C	5.7°C	-	5%	0.55kPa
13:00	-6.4°C	1.4°C	6.7°C	-	5%	0.6kPa
14:00	-6.7°C	2.5°C	7.3°C	-	9%	0.65kPa
15:00	-7.8°C	3.8°C	7.9°C	-	24%	0.72kPa
16:00	-9.5°C	4.7°C	8.1°C	-	25%	0.79kPa
17:00	-11°C	5.4°C	7.9°C	-	53%	0.8kPa
18:00	-11°C	5.8°C	7.4°C	-	100%	0.76kPa
19:00	-7.8°C	5.7°C	5.9°C	-	100%	0.59kPa
20:00	-7°C	5.4°C	4°C	-	100%	0.45kPa
21:00 ☾	-7.3°C	4.9°C	3°C	-	100%	0.4kPa
22:00 ☾	-7.6°C	4.4°C	2.5°C	-	100%	0.38kPa
23:00 ☾	-7.4°C	3.9°C	2°C	-	98%	0.36kPa
Sat, Apr 11 Sunrise 06:26 Sunset 20:34
24:00 ☾	-7.5°C	3.4°C	1.2°C	-	74%	0.32kPa
01:00 ☾	-7.5°C	2.9°C	0.69°C	-	52%	0.29kPa
02:00 ☾	-7.3°C	2.6°C	0.09°C	-	5%	0.26kPa
03:00 ☾	-7°C	2.6°C	-0.31°C	-	5%	0.24kPa
04:00 ☾	-6.9°C	2.6°C	-0.63°C	-	5%	0.22kPa
05:00 ☾	-7.1°C	2.6°C	-0.83°C	-	5%	0.22kPa
06:00 ☾	-7.3°C	2.6°C	-0.84°C	-	5%	0.22kPa
07:00	-7.2°C	2.4°C	-0.74°C	-	5%	0.22kPa
08:00	-7.1°C	2.1°C	0.88°C	-	5%	0.29kPa
09:00	-7.9°C	2.1°C	2.8°C	-	5%	0.41kPa
10:00	-5.1°C	1.3°C	3.1°C	-	5%	0.34kPa
11:00	-2.6°C	0.56°C	3.4°C	-	5%	0.27kPa
12:00	-0.4°C	-0.21°C	3.7°C	-	5%	0.2kPa
13:00	-0.4°C	-0.25°C	3.4°C	-	20%	0.18kPa
14:00	-0.3°C	-0.29°C	3°C	-	36%	0.16kPa
15:00	-0.3°C	-0.33°C	2.7°C	-	51%	0.14kPa
16:00	-0.6°C	-0.36°C	2.4°C	-	36%	0.14kPa
17:00	-0.8°C	-0.39°C	2.2°C	-	20%	0.14kPa
18:00	-1.1°C	-0.42°C	1.9°C	-	5%	0.14kPa
19:00	-1°C	-0.52°C	1.6°C	-	5%	0.12kPa
20:00	-0.9°C	-0.62°C	1.2°C	-	5%	0.1kPa
21:00 ☾	-0.9°C	-0.72°C	0.91°C	-	5%	0.08kPa
22:00 ☾	-0.9°C	-0.97°C	0.71°C	-	5%	0.07kPa
23:00 ☾	-0.9°C	-1.2°C	0.51°C	-	5%	0.06kPa
Sun, Apr 12 Sunrise 06:23 Sunset 20:36
24:00 ☾	-0.9°C	-1.5°C	0.32°C	-	5%	0.05kPa
01:00 ☾	-0.6°C	-1.4°C	0.78°C	-	5%	0.06kPa
02:00 ☾	-0.4°C	-1.3°C	1.2°C	-	5%	0.07kPa
03:00 ☾	-0.1°C	-1.2°C	1.7°C	-	5%	0.09kPa
04:00 ☾	-0.1°C	-0.91°C	2.1°C	-	6%	0.1kPa

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

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