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More Morning Frost in Southern Finland
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Rule Morning Frost

Porvoo - Morning Frost - Southern Finland

Porvoo, Uusimaa, 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 96% failing
Time Window 88% failing
Frost Probability 63% failing

Currently

Real-time conditions
Frost Probability
70%
Soil Temperature1.6°C
Dew Point-10.7°C (low dew point)
Wind Speed3.9m/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 74 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
Thu, Apr 9
07:00✓50%2.8m/s
08:00✕74%3.5m/s
09:00✕74%3.7m/s
10:00✕72%3.9m/s
11:00✕70%3.9m/s
12:00✕66%3.9m/s
13:00✕63%4m/s
14:00✕61%4.2m/s
15:00✕63%4.1m/s
16:00✕48%3.9m/s
17:00✕41%3.5m/s
18:00✕41%2.9m/s
19:00✕50%1.9m/s
20:00✕56%1.4m/s
21:00✕58%0.8m/s
22:00✕56%1.2m/s
23:00✕63%1.6m/s
Fri, Apr 10
24:00✕61%1.7m/s
01:00✕63%1.7m/s
02:00✕61%1.7m/s
03:00✕61%1.8m/s
04:00✕53%1.8m/s
05:00✓50%1.8m/s
06:00✓62%1.9m/s
07:00✓61%1.8m/s
08:00✕71%2m/s
09:00✕69%2.2m/s
10:00✕67%2.3m/s
11:00✕78%2.7m/s
12:00✕75%2.4m/s
13:00✕65%2.1m/s
14:00✕61%2m/s
15:00✕46%2m/s
16:00✕24%2.4m/s
17:00✕24%2.6m/s
18:00✕26%2.4m/s
19:00✕33%2.3m/s
20:00✕33%2.3m/s
21:00✕37%2.2m/s
22:00✕37%1.9m/s
23:00✕46%2m/s
Sat, Apr 11
24:00✕54%2m/s
01:00✕61%2.1m/s
02:00✕57%2.1m/s
03:00✕52%2.1m/s
04:00✕52%2.1m/s
05:00✓52%2.3m/s
06:00✓52%2.3m/s
07:00✓76%2.5m/s
08:00✕76%2.7m/s
09:00✕60%3.3m/s
10:00✕57%3.5m/s
11:00✕72%3.5m/s
12:00✕57%3.3m/s
13:00✕48%3.2m/s
14:00✕43%3.4m/s
15:00✕43%3.4m/s
16:00✕48%3m/s
17:00✕48%2.7m/s
18:00✕48%2.3m/s
19:00✕44%2.2m/s
20:00✕41%2.1m/s
21:00✕45%2m/s
22:00✕52%2.1m/s
23:00✕37%2.1m/s
Sun, Apr 12
24:00✕52%2.1m/s
01:00✕59%2.4m/s
02:00✕65%2.8m/s
03:00✕50%3.2m/s
04:00✕51%3.5m/s
05:00✓40%3.8m/s
06:00✓39%4.1m/s
07:00✓36%4.1m/s
08:00✕29%4.2m/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 06:18 Sunset 20:21
11:00
-11°C 1.6°C 3.2°C - 0% 0.5kPa
12:00
-11°C 1.6°C 4.7°C - 4% 0.6kPa
13:00
-12°C 1.6°C 5.8°C - 0% 0.67kPa
14:00
-12°C 1.6°C 6.4°C - 0% 0.71kPa
15:00
-11°C 2°C 6.7°C - 0% 0.72kPa
16:00
-11°C 2.8°C 6.7°C - 0% 0.72kPa
17:00
-11°C 3.5°C 6.5°C - 5% 0.7kPa
18:00
-10°C 3.9°C 5.6°C - 1% 0.63kPa
19:00
-7.7°C 4°C 4.1°C - 5% 0.48kPa
20:00
-6.8°C 3.6°C 1.5°C - 5% 0.32kPa
21:00 ☾
-7.1°C 3.2°C 0.23°C - 5% 0.26kPa
22:00 ☾
-7.2°C 3°C -0.02°C - 5% 0.25kPa
23:00 ☾
-7.3°C 2.9°C -0.23°C - 5% 0.25kPa
Fri, Apr 10 Sunrise 06:18 Sunset 20:21
24:00 ☾
-7.7°C 3°C -0.62°C - 5% 0.24kPa
01:00 ☾
-8.2°C 2.9°C -0.88°C - 5% 0.24kPa
02:00 ☾
-8.7°C 2.7°C -1.1°C - 5% 0.25kPa
03:00 ☾
-8.9°C 2.5°C -1.4°C - 6% 0.24kPa
04:00 ☾
-9°C 2.3°C -1.6°C - 37% 0.23kPa
05:00 ☾
-9°C 2°C -1.9°C - 46% 0.22kPa
06:00 ☾
-9.1°C 1.8°C -2.1°C - 75% 0.22kPa
07:00
-9.1°C 1.3°C -1.8°C - 99% 0.23kPa
08:00
-9.4°C 0.99°C -0.45°C - 100% 0.29kPa
09:00
-10°C 0.97°C 1.1°C - 91% 0.38kPa
10:00
-11°C 0.97°C 3°C - 100% 0.49kPa
11:00
-12°C 0.97°C 4.4°C - 5% 0.59kPa
12:00
-12°C 0.97°C 5.9°C - 5% 0.69kPa
13:00
-13°C 1.1°C 7.1°C - 5% 0.78kPa
14:00
-13°C 1.6°C 7.8°C - 5% 0.83kPa
15:00
-12°C 2.9°C 8.4°C - 8% 0.87kPa
16:00
-12°C 4°C 8.8°C - 99% 0.88kPa
17:00
-11°C 4.7°C 8.6°C - 100% 0.86kPa
18:00
-8.8°C 5.1°C 7.9°C - 100% 0.75kPa
19:00
-7.4°C 5.1°C 6.2°C - 100% 0.6kPa
20:00
-6.9°C 4.7°C 4.2°C - 100% 0.46kPa
21:00 ☾
-6.7°C 4.4°C 3.2°C - 100% 0.4kPa
22:00 ☾
-6.4°C 4°C 3°C - 100% 0.38kPa
23:00 ☾
-6.4°C 3.6°C 1.9°C - 33% 0.32kPa
Sat, Apr 11 Sunrise 06:15 Sunset 20:23
24:00 ☾
-6.3°C 3.1°C 0.84°C - 5% 0.27kPa
01:00 ☾
-6.1°C 2.6°C 0.23°C - 5% 0.23kPa
02:00 ☾
-6.1°C 2.4°C -0.32°C - 0% 0.21kPa
03:00 ☾
-6.2°C 2.4°C -0.8°C - 0% 0.19kPa
04:00 ☾
-6.5°C 2.4°C -1.1°C - 4% 0.19kPa
05:00 ☾
-6.6°C 2.4°C -1°C - 0% 0.19kPa
06:00 ☾
-6.8°C 2.2°C -1.1°C - 3% 0.2kPa
07:00
-6.8°C 1.8°C -0.51°C - 5% 0.22kPa
08:00
-6.7°C 1.6°C 1.3°C - 8% 0.3kPa
09:00
-6.2°C 1.6°C 3.4°C - 67% 0.39kPa
10:00
-4.7°C 1.6°C 5.2°C - 97% 0.45kPa
11:00
-3°C 1.7°C 6.6°C - 7% 0.48kPa
12:00
-1.9°C 2.1°C 7.9°C - 5% 0.53kPa
13:00
-1.1°C 3.4°C 9.1°C - 5% 0.6kPa
14:00
-0.6°C 4.5°C 10°C - 5% 0.65kPa
15:00
-0.4°C 5.7°C 11°C - 5% 0.69kPa
16:00
-1.3°C 5.4°C 8°C - 10% 0.51kPa
17:00
-2.4°C 5°C 5.2°C - 15% 0.37kPa
18:00
-3.6°C 4.7°C 2.5°C - 20% 0.26kPa
19:00
-3.3°C 4.2°C 2.1°C - 16% 0.23kPa
20:00
-2.9°C 3.7°C 1.6°C - 12% 0.2kPa
21:00 ☾
-2.7°C 3.2°C 1.2°C - 8% 0.16kPa
22:00 ☾
-2.2°C 2.8°C 0.93°C - 9% 0.13kPa
23:00 ☾
-1.7°C 2.3°C 0.64°C - 10% 0.1kPa
Sun, Apr 12 Sunrise 06:12 Sunset 20:26
24:00 ☾
-1.3°C 1.9°C 0.35°C - 11% 0.07kPa
01:00 ☾
-0.8°C 2°C 1.6°C - 9% 0.11kPa
02:00 ☾
-0.3°C 2°C 2.8°C - 7% 0.15kPa
03:00 ☾
0°C 2°C 4°C - 5% 0.2kPa
04:00 ☾
0°C 2.7°C 4.8°C - 23% 0.25kPa
05:00 ☾
0°C 3.5°C 5.6°C - 40% 0.3kPa
06:00 ☾
-0.1°C 4.2°C 6.4°C - 57% 0.36kPa
07:00
-0.1°C 4.7°C 6.1°C - 70% 0.34kPa
08:00
0°C 5.3°C 5.8°C - 84% 0.31kPa
09:00
0.1°C 5.8°C 5.5°C - 97% 0.29kPa
10:00
-0.3°C 5.8°C 5.1°C - 96% 0.28kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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