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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)
Frost Probability 100% failing
Wind Speed 90% failing
Time Window 88% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature12.8°C
Dew Point10.7°C (moderate dew point)
Wind Speed1.5m/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 80 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, Jul 8
08:00✕0%1.6m/s
09:00✕0%1.9m/s
10:00✕0%2m/s
11:00✕0%2m/s
12:00✕0%2.2m/s
13:00✕0%2.6m/s
14:00✕0%2.3m/s
15:00✕0%2m/s
16:00✕0%1.5m/s
17:00✕0%1.5m/s
18:00✕0%2.9m/s
19:00✕0%3.2m/s
20:00✕0%2m/s
21:00✕0%2.7m/s
22:00✕0%2.8m/s
23:00✕0%3.4m/s
Thu, Jul 9
24:00✕0%3.6m/s
01:00✕0%3.9m/s
02:00✕0%3.9m/s
03:00✓0%4.1m/s
04:00✓0%4.7m/s
05:00✓0%5.1m/s
06:00✕0%5.9m/s
07:00✕0%6m/s
08:00✕0%5.9m/s
09:00✕0%5.1m/s
10:00✕0%4.5m/s
11:00✕0%3.9m/s
12:00✕0%4.1m/s
13:00✕0%4.1m/s
14:00✕0%3.5m/s
15:00✕0%3.1m/s
16:00✕0%2.8m/s
17:00✕0%2.1m/s
18:00✕0%2m/s
19:00✕0%2.4m/s
20:00✕0%2.4m/s
21:00✕0%1.5m/s
22:00✕0%1.6m/s
23:00✕0%1.8m/s
Fri, Jul 10
24:00✕0%1.9m/s
01:00✕0%1.9m/s
02:00✕0%2m/s
03:00✓0%1.9m/s
04:00✓0%2m/s
05:00✓0%2m/s
06:00✕0%1.6m/s
07:00✕0%1.9m/s
08:00✕0%2.2m/s
09:00✕0%2.3m/s
10:00✕0%2.9m/s
11:00✕0%2.8m/s
12:00✕0%3.3m/s
13:00✕0%3.3m/s
14:00✕0%3.3m/s
15:00✕0%3.3m/s
16:00✕0%3.5m/s
17:00✕0%3.1m/s
18:00✕0%2.8m/s
19:00✕0%2.1m/s
20:00✕0%1.3m/s
21:00✕0%1.1m/s
22:00✕0%1.4m/s
23:00✕0%1.6m/s
Sat, Jul 11
24:00✕0%1.9m/s
01:00✕0%1.8m/s
02:00✕0%1.8m/s
03:00✓0%1.8m/s
04:00✓0%1.6m/s
05:00✓0%1.5m/s
06:00✕0%1.4m/s
07:00✕0%1.7m/s
08:00✕0%1.9m/s
09:00✕0%2.2m/s
10:00✕0%2m/s
11:00✕0%1.8m/s
12:00✕0%1.6m/s
13:00✕0%1.2m/s
14:00✕0%0.78m/s
15:00✕0%0.37m/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
Wed, Jul 8 Sunrise 04:05 Sunset 22:38
17:00
11°C 13°C 17°C - 100% 0.69kPa
18:00
11°C 13°C 17°C - 100% 0.6kPa
19:00
10°C 13°C 16°C - 100% 0.53kPa
20:00
11°C 13°C 14°C - 100% 0.27kPa
21:00
11°C 13°C 14°C - 100% 0.25kPa
22:00
11°C 13°C 14°C - 91% 0.26kPa
23:00 ☾
11°C 13°C 13°C - 100% 0.26kPa
Thu, Jul 9 Sunrise 04:05 Sunset 22:38
24:00 ☾
9.6°C 13°C 14°C - 100% 0.38kPa
01:00 ☾
9.4°C 13°C 14°C - 100% 0.39kPa
02:00 ☾
9.4°C 13°C 13°C - 100% 0.37kPa
03:00 ☾
9.5°C 13°C 13°C - 100% 0.33kPa
04:00 ☾
9.9°C 13°C 13°C - 100% 0.23kPa
05:00
11°C 13°C 12°C - 100% 0.11kPa
06:00
11°C 13°C 12°C - 100% 0.07kPa
07:00
11°C 12°C 12°C - 100% 0.06kPa
08:00
12°C 12°C 12°C - 100% 0.05kPa
09:00
12°C 12°C 12°C - 100% 0.04kPa
10:00
12°C 12°C 13°C - 100% 0.04kPa
11:00
12°C 12°C 12°C - 100% 0.03kPa
12:00
13°C 12°C 13°C - 100% 0.03kPa
13:00
13°C 12°C 13°C - 100% 0.03kPa
14:00
13°C 12°C 13°C - 100% 0.03kPa
15:00
14°C 12°C 14°C - 99% 0.05kPa
16:00
14°C 12°C 16°C - 80% 0.22kPa
17:00
13°C 13°C 18°C - 18% 0.67kPa
18:00
11°C 13°C 20°C - 0% 1kPa
19:00
11°C 13°C 20°C - 0% 0.97kPa
20:00
12°C 13°C 18°C - 51% 0.64kPa
21:00
13°C 13°C 16°C - 100% 0.34kPa
22:00
12°C 13°C 15°C - 98% 0.34kPa
23:00 ☾
11°C 13°C 15°C - 4% 0.32kPa
Fri, Jul 10 Sunrise 04:06 Sunset 22:37
24:00 ☾
11°C 13°C 12°C - 0% 0.14kPa
01:00 ☾
10°C 13°C 12°C - 0% 0.1kPa
02:00 ☾
10°C 13°C 11°C - 57% 0.09kPa
03:00 ☾
10°C 13°C 11°C - 20% 0.06kPa
04:00 ☾
10°C 13°C 11°C - 10% 0.05kPa
05:00
10°C 13°C 11°C - 100% 0.05kPa
06:00
11°C 12°C 13°C - 100% 0.13kPa
07:00
12°C 12°C 14°C - 100% 0.24kPa
08:00
12°C 12°C 16°C - 100% 0.38kPa
09:00
12°C 13°C 17°C - 44% 0.59kPa
10:00
11°C 13°C 19°C - 0% 0.89kPa
11:00
11°C 13°C 20°C - 75% 1.1kPa
12:00
10°C 13°C 21°C - 100% 1.2kPa
13:00
10°C 14°C 21°C - 100% 1.2kPa
14:00
9.8°C 14°C 21°C - 100% 1.3kPa
15:00
9.7°C 14°C 21°C - 39% 1.3kPa
16:00
9.5°C 14°C 22°C - 34% 1.4kPa
17:00
9.6°C 15°C 21°C - 4% 1.4kPa
18:00
9.9°C 15°C 21°C - 7% 1.3kPa
19:00
11°C 15°C 21°C - 100% 1.2kPa
20:00
13°C 15°C 20°C - 100% 0.8kPa
21:00
12°C 15°C 18°C - 100% 0.59kPa
22:00
13°C 15°C 17°C - 98% 0.38kPa
23:00 ☾
14°C 15°C 15°C - 97% 0.2kPa
Sat, Jul 11 Sunrise 04:08 Sunset 22:35
24:00 ☾
14°C 15°C 14°C - 95% 0.04kPa
01:00 ☾
14°C 15°C 15°C - 97% 0.06kPa
02:00 ☾
15°C 15°C 15°C - 98% 0.08kPa
03:00 ☾
15°C 15°C 16°C - 100% 0.1kPa
04:00 ☾
15°C 15°C 16°C - 100% 0.19kPa
05:00
15°C 15°C 17°C - 100% 0.28kPa
06:00
15°C 15°C 18°C - 100% 0.38kPa
07:00
16°C 15°C 20°C - 87% 0.54kPa
08:00
16°C 15°C 21°C - 74% 0.73kPa
09:00
16°C 15°C 23°C - 61% 0.96kPa
10:00
18°C 16°C 23°C - 74% 0.76kPa
11:00
19°C 16°C 23°C - 87% 0.57kPa
12:00
20°C 16°C 23°C - 100% 0.38kPa
13:00
20°C 16°C 22°C - 99% 0.31kPa
14:00
19°C 17°C 21°C - 99% 0.25kPa
15:00
19°C 17°C 20°C - 98% 0.2kPa
16:00
18°C 17°C 19°C - 68% 0.16kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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