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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)
Frost Probability 90% failing
Time Window 83% failing
Wind Speed 76% failing

Currently

Real-time conditions
Frost Probability
54%
Soil Temperature-6.4°C
Dew Point-13.6°C (low dew point)
Wind Speed0.9m/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 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
Sun, Feb 22
03:00✕50%3.1m/s
04:00✕52%2.1m/s
05:00✕50%3.4m/s
06:00✕48%5.1m/s
07:00✓52%5.5m/s
08:00✓52%5.1m/s
09:00✓48%5m/s
10:00✕52%5m/s
11:00✕53%4.7m/s
12:00✕67%4.6m/s
13:00✕67%4.5m/s
14:00✕67%4.2m/s
15:00✕69%4.2m/s
16:00✕69%3.9m/s
17:00✕69%3.5m/s
18:00✕71%2.7m/s
19:00✕67%2.5m/s
20:00✕67%2.3m/s
21:00✕67%2.2m/s
22:00✕63%1.7m/s
23:00✕55%1.4m/s
Mon, Feb 23
24:00✕54%1.3m/s
01:00✕54%1.3m/s
02:00✕54%0.86m/s
03:00✕54%1.1m/s
04:00✕54%0.88m/s
05:00✕56%0.56m/s
06:00✓56%0.37m/s
07:00✓56%0.27m/s
08:00✓56%0.68m/s
09:00✓56%0.74m/s
10:00✕58%0.9m/s
11:00✕62%1.1m/s
12:00✕70%1.4m/s
13:00✕80%1.4m/s
14:00✕70%1.6m/s
15:00✕82%1.8m/s
16:00✕73%1.6m/s
17:00✕55%1.4m/s
18:00✕55%1.6m/s
19:00✕54%1.6m/s
20:00✕52%1.8m/s
21:00✕59%2m/s
22:00✕52%2m/s
23:00✕53%2.1m/s
Tue, Feb 24
24:00✕52%2.1m/s
01:00✕52%2m/s
02:00✕52%2.2m/s
03:00✕52%2m/s
04:00✕52%2.1m/s
05:00✕56%2.3m/s
06:00✓56%2.1m/s
07:00✓56%2.1m/s
08:00✓56%2.2m/s
09:00✓56%2.3m/s
10:00✕56%2.3m/s
11:00✕56%2.7m/s
12:00✕56%2.4m/s
13:00✕56%2.4m/s
14:00✕56%2.3m/s
15:00✕56%2.5m/s
16:00✕56%2m/s
17:00✕56%2m/s
18:00✕52%1.8m/s
19:00✕54%1.6m/s
20:00✕54%1.7m/s
21:00✕54%1.6m/s
22:00✕54%1.6m/s
23:00✕52%1.7m/s
Wed, Feb 25
24:00✕54%1.5m/s
01:00✕54%1.6m/s
02:00✕53%1.8m/s
03:00✕53%1.7m/s
04:00✕53%1.7m/s
05:00✕52%1.8m/s
06:00✓54%1.6m/s
07:00✓52%1.8m/s
08:00✓54%1.7m/s
09:00✓55%1.5m/s
10:00✕55%1.3m/s
11:00✕62%1.1m/s
12:00✕59%1.3m/s
13:00✕54%1.6m/s
14:00✕52%1.8m/s
15:00✕56%2.1m/s
16:00✕56%2.4m/s
17:00✕56%2.6m/s
18:00✕54%3.1m/s
19:00✕54%3.5m/s
20:00✕54%4m/s
21:00✕52%4.2m/s
22:00✕52%4.5m/s
23:00✕52%4.7m/s
Thu, Feb 26
24:00✕52%5.1m/s
01:00✕52%5.4m/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
Mon, Feb 23 Sunrise 07:43 Sunset 17:34
04:00 ☾
-14°C -6.4°C -13°C - 100% 0kPa
05:00 ☾
-13°C -6.5°C -13°C - 100% 0kPa
06:00 ☾
-12°C -6.5°C -12°C - 100% 0.01kPa
07:00 ☾
-12°C -6.6°C -12°C - 100% 0.01kPa
08:00
-12°C -6.6°C -12°C - 100% 0.01kPa
09:00
-9.9°C -6.6°C -9.3°C - 100% 0.02kPa
10:00
-7.9°C -6.6°C -6.4°C - 100% 0.04kPa
11:00
-7°C -6.6°C -4.6°C - 57% 0.07kPa
12:00
-6.4°C -6.6°C -3.2°C - 49% 0.1kPa
13:00
-6.2°C -6.5°C -2.4°C - 15% 0.13kPa
14:00
-6°C -6.4°C -2.1°C - 60% 0.13kPa
15:00
-5.6°C -6.3°C -2.2°C - 5% 0.12kPa
16:00
-5°C -6.2°C -3.1°C - 5% 0.07kPa
17:00
-7.3°C -6.2°C -6.6°C - 60% 0.02kPa
18:00 ☾
-10°C -6.2°C -9.9°C - 62% 0.01kPa
19:00 ☾
-12°C -6.2°C -11°C - 89% 0.01kPa
20:00 ☾
-12°C -6.2°C -12°C - 98% 0.01kPa
21:00 ☾
-11°C -6.3°C -11°C - 36% 0.01kPa
22:00 ☾
-13°C -6.3°C -12°C - 99% 0.01kPa
23:00 ☾
-13°C -6.4°C -12°C - 80% 0.02kPa
Tue, Feb 24 Sunrise 07:43 Sunset 17:34
24:00 ☾
-14°C -6.5°C -13°C - 98% 0.01kPa
01:00 ☾
-13°C -6.5°C -12°C - 97% 0.02kPa
02:00 ☾
-13°C -6.6°C -12°C - 100% 0.02kPa
03:00 ☾
-12°C -6.6°C -11°C - 100% 0.02kPa
04:00 ☾
-12°C -6.6°C -11°C - 100% 0.02kPa
05:00 ☾
-12°C -6.7°C -11°C - 100% 0.02kPa
06:00 ☾
-11°C -6.7°C -10°C - 100% 0.02kPa
07:00 ☾
-11°C -6.7°C -9.7°C - 100% 0.03kPa
08:00
-10°C -6.7°C -9.1°C - 100% 0.03kPa
09:00
-9.8°C -6.7°C -8.3°C - 100% 0.04kPa
10:00
-9°C -6.7°C -7.2°C - 100% 0.05kPa
11:00
-8.3°C -6.7°C -5.9°C - 100% 0.07kPa
12:00
-7.8°C -6.6°C -5.1°C - 100% 0.08kPa
13:00
-7.3°C -6.6°C -4.4°C - 100% 0.09kPa
14:00
-6.9°C -6.4°C -4°C - 100% 0.09kPa
15:00
-6.6°C -6.4°C -3.9°C - 100% 0.08kPa
16:00
-6°C -6.3°C -4.2°C - 100% 0.06kPa
17:00
-6.3°C -6.3°C -4.9°C - 100% 0.04kPa
18:00 ☾
-6.6°C -6.2°C -5.8°C - 100% 0.02kPa
19:00 ☾
-7.2°C -6.2°C -6.6°C - 100% 0.02kPa
20:00 ☾
-7.3°C -6.2°C -6.9°C - 100% 0.01kPa
21:00 ☾
-7.9°C -6.2°C -7.4°C - 100% 0.01kPa
22:00 ☾
-8.3°C -6.2°C -7.8°C - 85% 0.01kPa
23:00 ☾
-9.8°C -6.2°C -9.4°C - 89% 0.01kPa
Wed, Feb 25 Sunrise 07:40 Sunset 17:37
24:00 ☾
-11°C -6.2°C -10°C - 96% 0.01kPa
01:00 ☾
-11°C -6.3°C -11°C - 91% 0.01kPa
02:00 ☾
-11°C -6.3°C -11°C - 79% 0.01kPa
03:00 ☾
-13°C -6.3°C -13°C - 66% 0kPa
04:00 ☾
-14°C -6.4°C -14°C - 78% 0kPa
05:00 ☾
-15°C -6.5°C -15°C - 88% 0kPa
06:00 ☾
-15°C -6.6°C -15°C - 88% 0kPa
07:00 ☾
-16°C -6.7°C -16°C - 89% 0kPa
08:00
-16°C -6.8°C -16°C - 89% 0kPa
09:00
-13°C -6.7°C -13°C - 76% 0.01kPa
10:00
-10°C -6.6°C -9.4°C - 63% 0.02kPa
11:00
-7.2°C -6.5°C -6.1°C - 51% 0.03kPa
12:00
-8.3°C -6.5°C -7.3°C - 67% 0.03kPa
13:00
-9.4°C -6.5°C -8.5°C - 84% 0.02kPa
14:00
-11°C -6.5°C -9.7°C - 100% 0.02kPa
15:00
-10°C -6.5°C -8.9°C - 100% 0.03kPa
16:00
-9.6°C -6.6°C -8.1°C - 100% 0.04kPa
17:00
-9.1°C -6.6°C -7.3°C - 100% 0.04kPa
18:00 ☾
-8.1°C -6.5°C -6.3°C - 100% 0.05kPa
19:00 ☾
-7.1°C -6.5°C -5.3°C - 100% 0.05kPa
20:00 ☾
-6.1°C -6.5°C -4.2°C - 100% 0.06kPa
21:00 ☾
-5.5°C -6.4°C -3.8°C - 100% 0.06kPa
22:00 ☾
-4.8°C -6.4°C -3.4°C - 100% 0.05kPa
23:00 ☾
-4.2°C -6.3°C -3°C - 100% 0.04kPa
Thu, Feb 26 Sunrise 07:38 Sunset 17:40
24:00 ☾
-3.9°C -6.2°C -2.6°C - 100% 0.05kPa
01:00 ☾
-3.5°C -6.2°C -2.2°C - 100% 0.05kPa
02:00 ☾
-3.2°C -6.1°C -1.7°C - 100% 0.06kPa
03:00 ☾
-2.9°C -6°C -1.3°C - 100% 0.06kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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