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More Morning Frost in Southern Finland
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Rule Morning Frost

Torronsuo - Morning Frost - Southern Finland

Torronsuon Kansallispuisto, Kanta-Häme, 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 92% failing
Time Window 88% failing
Frost Probability 74% failing

Currently

Real-time conditions
Frost Probability
70%
Soil Temperature1.6°C
Dew Point-11.1°C (low dew point)
Wind Speed3.3m/s (calm conditions)
Cloud Cover5%

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 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
10:00✕68%5.1m/s
11:00✕57%5.3m/s
12:00✕55%5.2m/s
13:00✕46%5.4m/s
14:00✕46%5.5m/s
15:00✕44%5.3m/s
16:00✕44%5.3m/s
17:00✕44%5.1m/s
18:00✕44%4.3m/s
19:00✕44%4.2m/s
20:00✕48%3.9m/s
21:00✕52%3.2m/s
22:00✕52%3.4m/s
23:00✕52%3.4m/s
Thu, Apr 9
24:00✕52%3.2m/s
01:00✕52%3.1m/s
02:00✕47%3m/s
03:00✕43%2.8m/s
04:00✕45%2.6m/s
05:00✓45%2.4m/s
06:00✓52%2.2m/s
07:00✓52%2.1m/s
08:00✕69%2.9m/s
09:00✕74%3.1m/s
10:00✕72%3.2m/s
11:00✕70%3.3m/s
12:00✕66%3.2m/s
13:00✕48%3.4m/s
14:00✕48%3.4m/s
15:00✕48%3.3m/s
16:00✕49%3.2m/s
17:00✕33%3.3m/s
18:00✕35%2.6m/s
19:00✕35%2m/s
20:00✕46%2.1m/s
21:00✕46%2.2m/s
22:00✕46%1.9m/s
23:00✕39%1.6m/s
Fri, Apr 10
24:00✕39%1.2m/s
01:00✕45%0.32m/s
02:00✕52%0.71m/s
03:00✕50%1.4m/s
04:00✕46%1.6m/s
05:00✓41%1.7m/s
06:00✓41%1.8m/s
07:00✓65%1.8m/s
08:00✕61%2.1m/s
09:00✕59%2.4m/s
10:00✕57%2.6m/s
11:00✕53%2.4m/s
12:00✕51%2.2m/s
13:00✕65%2.3m/s
14:00✕65%2.1m/s
15:00✕65%1.9m/s
16:00✕50%2m/s
17:00✕43%2.1m/s
18:00✕26%2.3m/s
19:00✕35%1.5m/s
20:00✕35%1.4m/s
21:00✕37%2.1m/s
22:00✕39%2.3m/s
23:00✕46%2.3m/s
Sat, Apr 11
24:00✕46%2m/s
01:00✕50%1.9m/s
02:00✕61%2.1m/s
03:00✕61%2m/s
04:00✕61%2.1m/s
05:00✓52%2.2m/s
06:00✓52%2.2m/s
07:00✓52%2.1m/s
08:00✕76%2.5m/s
09:00✕72%3.2m/s
10:00✕70%3.2m/s
11:00✕62%3.3m/s
12:00✕56%3.3m/s
13:00✕41%3.4m/s
14:00✕45%3.3m/s
15:00✕43%3.3m/s
16:00✕44%2.8m/s
17:00✕44%2.3m/s
18:00✕40%1.8m/s
19:00✕37%1.9m/s
20:00✕37%2m/s
21:00✕44%2.1m/s
22:00✕48%2.3m/s
23:00✕48%2.4m/s
Sun, Apr 12
24:00✕59%2.6m/s
01:00✕65%2.8m/s
02:00✕65%3.1m/s
03:00✕70%3.3m/s
04:00✕47%3.6m/s
05:00✓41%3.8m/s
06:00✓34%4.1m/s
07:00✓33%4m/s
08:00✕33%3.9m/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 06:25 Sunset 20:30
11:00
-11°C 1.6°C 3.1°C - 5% 0.5kPa
12:00
-12°C 1.6°C 4.6°C - 5% 0.6kPa
13:00
-12°C 1.6°C 5.8°C - 100% 0.68kPa
14:00
-12°C 1.6°C 6.4°C - 100% 0.72kPa
15:00
-12°C 1.6°C 7°C - 100% 0.76kPa
16:00
-12°C 1.7°C 7.1°C - 73% 0.76kPa
17:00
-11°C 2.6°C 7°C - 100% 0.75kPa
18:00
-9.2°C 3°C 6.1°C - 100% 0.64kPa
19:00
-7.5°C 3.1°C 4.4°C - 100% 0.49kPa
20:00
-7.2°C 2.9°C 2.5°C - 100% 0.38kPa
21:00 ☾
-7.1°C 2.6°C 1°C - 100% 0.3kPa
22:00 ☾
-6.4°C 2.3°C -0.12°C - 100% 0.23kPa
23:00 ☾
-5.8°C 2.3°C -0.73°C - 100% 0.18kPa
Fri, Apr 10 Sunrise 06:25 Sunset 20:30
24:00 ☾
-5.8°C 2.3°C -1.1°C - 94% 0.17kPa
01:00 ☾
-6.2°C 2.3°C -1.4°C - 51% 0.17kPa
02:00 ☾
-6.5°C 2.3°C -1.5°C - 14% 0.17kPa
03:00 ☾
-6.7°C 2.3°C -1.6°C - 14% 0.17kPa
04:00 ☾
-6.8°C 2.3°C -1.6°C - 36% 0.17kPa
05:00 ☾
-7.2°C 2.3°C -1.8°C - 53% 0.18kPa
06:00 ☾
-7.8°C 2.1°C -1.9°C - 53% 0.19kPa
07:00
-8.6°C 1.7°C -1.9°C - 57% 0.21kPa
08:00
-9.5°C 1.4°C -0.45°C - 100% 0.29kPa
09:00
-10°C 1.4°C 1.1°C - 100% 0.38kPa
10:00
-11°C 1.4°C 2.5°C - 100% 0.47kPa
11:00
-12°C 1.4°C 3.8°C - 100% 0.56kPa
12:00
-12°C 1.4°C 5.1°C - 80% 0.63kPa
13:00
-12°C 1.4°C 6.3°C - 7% 0.7kPa
14:00
-11°C 1.4°C 7.1°C - 5% 0.76kPa
15:00
-11°C 1.7°C 7.6°C - 5% 0.79kPa
16:00
-11°C 2.8°C 7.9°C - 5% 0.8kPa
17:00
-11°C 3.6°C 7.9°C - 5% 0.8kPa
18:00
-11°C 4.1°C 7.6°C - 100% 0.77kPa
19:00
-7.3°C 4.2°C 6°C - 100% 0.58kPa
20:00
-7.7°C 4.1°C 4.1°C - 100% 0.47kPa
21:00 ☾
-7.3°C 3.6°C 2.8°C - 100% 0.4kPa
22:00 ☾
-6°C 3.3°C 1.8°C - 100% 0.3kPa
23:00 ☾
-5.6°C 2.9°C 1.4°C - 100% 0.27kPa
Sat, Apr 11 Sunrise 06:22 Sunset 20:32
24:00 ☾
-5.6°C 2.6°C 1.4°C - 100% 0.28kPa
01:00 ☾
-6°C 2.3°C 1.1°C - 40% 0.27kPa
02:00 ☾
-6.8°C 2.2°C -0.32°C - 5% 0.23kPa
03:00 ☾
-7.1°C 2.2°C -0.8°C - 2% 0.22kPa
04:00 ☾
-7.2°C 2.2°C -1.1°C - 0% 0.21kPa
05:00 ☾
-7.1°C 2.2°C -1.3°C - 0% 0.2kPa
06:00 ☾
-6.9°C 2.2°C -1.5°C - 0% 0.18kPa
07:00
-6.9°C 2.2°C -1.3°C - 0% 0.19kPa
08:00
-7.1°C 1.9°C 0.53°C - 5% 0.28kPa
09:00
-8°C 1.9°C 2.7°C - 5% 0.4kPa
10:00
-8°C 1.9°C 4.5°C - 6% 0.5kPa
11:00
-7.3°C 1.9°C 6°C - 26% 0.58kPa
12:00
-5.5°C 1.9°C 7.2°C - 51% 0.61kPa
13:00
-4°C 2.1°C 8.1°C - 46% 0.63kPa
14:00
-3°C 3.3°C 9.1°C - 5% 0.66kPa
15:00
-2.3°C 4.4°C 9.8°C - 5% 0.69kPa
16:00
-2°C 4.4°C 7.3°C - 16% 0.49kPa
17:00
-2.3°C 4.4°C 4.7°C - 28% 0.34kPa
18:00
-2.8°C 4.5°C 2.2°C - 39% 0.22kPa
19:00
-2.9°C 4°C 1.9°C - 37% 0.2kPa
20:00
-3°C 3.5°C 1.5°C - 35% 0.19kPa
21:00 ☾
-3°C 3°C 1.2°C - 34% 0.18kPa
22:00 ☾
-2.7°C 2.6°C 1°C - 24% 0.16kPa
23:00 ☾
-2.4°C 2.2°C 0.78°C - 15% 0.13kPa
Sun, Apr 12 Sunrise 06:19 Sunset 20:35
24:00 ☾
-2.1°C 1.9°C 0.55°C - 5% 0.11kPa
01:00 ☾
-1.7°C 1.9°C 1.6°C - 5% 0.15kPa
02:00 ☾
-1.4°C 1.9°C 2.7°C - 5% 0.19kPa
03:00 ☾
-1.2°C 1.9°C 3.7°C - 5% 0.24kPa
04:00 ☾
-0.9°C 2.6°C 5°C - 28% 0.3kPa
05:00 ☾
-0.8°C 3.3°C 6.2°C - 51% 0.37kPa
06:00 ☾
-0.7°C 4.1°C 7.4°C - 74% 0.45kPa
07:00
-0.8°C 4.5°C 7.2°C - 82% 0.44kPa
08:00
-0.9°C 4.8°C 6.9°C - 91% 0.42kPa
09:00
-1°C 5.2°C 6.6°C - 100% 0.41kPa
10:00
-0.8°C 5.3°C 6.3°C - 76% 0.38kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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