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Rule Morning Frost

Kurjenrahka - Morning Frost - Southern Finland

Turku, 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)
Frost Probability 100% failing
Wind Speed 96% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature13.3°C
Dew Point12.1°C (moderate dew point)
Wind Speed3.5m/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 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
Tue, Jul 7
16:000%4.3m/s
17:000%5.2m/s
18:000%4.2m/s
19:000%4m/s
20:000%3.1m/s
21:000%2.7m/s
22:000%2.1m/s
23:000%2.3m/s
Wed, Jul 8
24:000%2.1m/s
01:000%1.6m/s
02:000%2.3m/s
03:000%2.1m/s
04:000%1.7m/s
05:000%2.4m/s
06:000%1.8m/s
07:000%2m/s
08:000%2.2m/s
09:000%2.8m/s
10:000%2.8m/s
11:000%3.1m/s
12:000%3.2m/s
13:000%2.9m/s
14:000%3m/s
15:000%2.9m/s
16:000%3m/s
17:000%3.5m/s
18:000%3.8m/s
19:000%3.8m/s
20:000%3.6m/s
21:000%3.4m/s
22:000%3.4m/s
23:000%3.6m/s
Thu, Jul 9
24:000%3.9m/s
01:000%4.3m/s
02:000%4.5m/s
03:000%4.7m/s
04:000%4.7m/s
05:000%4.5m/s
06:000%4.8m/s
07:000%4.6m/s
08:000%4.7m/s
09:000%5.2m/s
10:000%5.6m/s
11:000%5m/s
12:000%4.4m/s
13:000%3.4m/s
14:000%3.6m/s
15:000%4.6m/s
16:000%4.5m/s
17:000%4.1m/s
18:000%4m/s
19:000%4.3m/s
20:000%3.9m/s
21:000%3.4m/s
22:000%2.9m/s
23:000%2.4m/s
Fri, Jul 10
24:000%2.5m/s
01:000%2.6m/s
02:000%2.6m/s
03:000%2.5m/s
04:000%2.6m/s
05:000%2.6m/s
06:000%2.4m/s
07:000%2.2m/s
08:000%2.3m/s
09:000%2.3m/s
10:000%2.3m/s
11:000%2.3m/s
12:000%2.2m/s
13:000%2m/s
14:000%1.6m/s
15:000%0.85m/s
16:000%0.5m/s
17:000%3.2m/s
18:000%3.4m/s
19:000%2.7m/s
20:000%2.1m/s
21:000%1.4m/s
22:000%1.6m/s
23:000%1.9m/s
Sat, Jul 11
24:000%2.1m/s
01:000%2.2m/s
02:000%2.2m/s
03:000%2.2m/s
04:000%2.1m/s
05:000%2m/s
06:000%1.9m/s
07:000%2.4m/s
08:000%2.8m/s
09:000%3.2m/s
10:000%3m/s
11:000%2.8m/s
12:000%2.7m/s
13:000%2.5m/s
14:000%2.3m/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 04:17 Sunset 22:52
17:00
12°C 13°C 16°C - 100% 0.4kPa
18:00
13°C 13°C 16°C - 100% 0.31kPa
19:00
13°C 13°C 15°C - 100% 0.2kPa
20:00
12°C 13°C 14°C - 100% 0.16kPa
21:00
12°C 13°C 14°C - 100% 0.15kPa
22:00
12°C 13°C 13°C - 100% 0.11kPa
23:00
12°C 13°C 12°C - 100% 0.07kPa
Thu, Jul 9 Sunrise 04:17 Sunset 22:52
24:00
11°C 13°C 12°C - 100% 0.07kPa
01:00
11°C 13°C 12°C - 18% 0.07kPa
02:00
10°C 13°C 11°C - 27% 0.07kPa
03:00
10°C 13°C 11°C - 100% 0.07kPa
04:00
9.8°C 13°C 11°C - 100% 0.08kPa
05:00
9.5°C 12°C 10°C - 100% 0.08kPa
06:00
9.6°C 12°C 11°C - 95% 0.1kPa
07:00
9.7°C 12°C 11°C - 100% 0.15kPa
08:00
9.7°C 12°C 13°C - 99% 0.27kPa
09:00
9.3°C 12°C 15°C - 100% 0.54kPa
10:00
8.8°C 12°C 17°C - 100% 0.78kPa
11:00
8.9°C 13°C 18°C - 100% 0.93kPa
12:00
9.5°C 13°C 18°C - 100% 0.86kPa
13:00
10°C 13°C 15°C - 100% 0.47kPa
14:00
11°C 13°C 13°C - 100% 0.19kPa
15:00
12°C 13°C 13°C - 100% 0.09kPa
16:00
12°C 13°C 13°C - 100% 0.1kPa
17:00
12°C 13°C 13°C - 100% 0.13kPa
18:00
12°C 13°C 13°C - 100% 0.15kPa
19:00
12°C 13°C 13°C - 100% 0.16kPa
20:00
12°C 13°C 14°C - 100% 0.14kPa
21:00
13°C 13°C 14°C - 36% 0.12kPa
22:00
13°C 13°C 14°C - 16% 0.06kPa
23:00
12°C 13°C 13°C - 34% 0.02kPa
Fri, Jul 10 Sunrise 04:19 Sunset 22:51
24:00
12°C 13°C 12°C - 35% 0.02kPa
01:00
12°C 12°C 12°C - 34% 0.02kPa
02:00
12°C 12°C 12°C - 37% 0.02kPa
03:00
12°C 12°C 12°C - 39% 0.01kPa
04:00
12°C 12°C 12°C - 42% 0.01kPa
05:00
12°C 12°C 12°C - 40% 0.01kPa
06:00
12°C 12°C 12°C - 25% 0.03kPa
07:00
13°C 12°C 14°C - 68% 0.12kPa
08:00
13°C 12°C 15°C - 100% 0.3kPa
09:00
12°C 12°C 17°C - 100% 0.5kPa
10:00
11°C 13°C 18°C - 100% 0.77kPa
11:00
11°C 13°C 19°C - 100% 0.93kPa
12:00
11°C 13°C 20°C - 100% 1.1kPa
13:00
11°C 14°C 21°C - 100% 1.2kPa
14:00
11°C 14°C 22°C - 95% 1.4kPa
15:00
11°C 14°C 23°C - 79% 1.6kPa
16:00
10°C 15°C 23°C - 100% 1.6kPa
17:00
13°C 15°C 19°C - 100% 0.72kPa
18:00
14°C 15°C 18°C - 100% 0.43kPa
19:00
14°C 15°C 18°C - 29% 0.4kPa
20:00
14°C 15°C 19°C - 4% 0.57kPa
21:00
15°C 15°C 18°C - 0% 0.4kPa
22:00
14°C 15°C 17°C - 33% 0.3kPa
23:00
13°C 14°C 15°C - 67% 0.2kPa
Sat, Jul 11 Sunrise 04:21 Sunset 22:50
24:00
13°C 14°C 14°C - 100% 0.12kPa
01:00
13°C 14°C 14°C - 100% 0.12kPa
02:00
13°C 14°C 14°C - 100% 0.11kPa
03:00
14°C 14°C 15°C - 100% 0.11kPa
04:00
14°C 14°C 15°C - 100% 0.11kPa
05:00
14°C 14°C 15°C - 100% 0.12kPa
06:00
14°C 14°C 15°C - 100% 0.13kPa
07:00
14°C 14°C 17°C - 100% 0.29kPa
08:00
14°C 14°C 18°C - 100% 0.47kPa
09:00
14°C 15°C 19°C - 100% 0.68kPa
10:00
14°C 15°C 19°C - 99% 0.64kPa
11:00
14°C 15°C 19°C - 97% 0.61kPa
12:00
15°C 15°C 19°C - 96% 0.57kPa
13:00
15°C 15°C 19°C - 97% 0.49kPa
14:00
15°C 15°C 19°C - 99% 0.41kPa
15:00
16°C 15°C 18°C - 100% 0.34kPa
16:00
16°C 15°C 17°C - 100% 0.23kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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