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Rule Morning Frost

Punkaharju - Morning Frost - Southern Finland

Punkaharju, South Savo, 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 89% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature9725.9°C
Dew Point8.8°C (moderate dew point)
Wind Speed3.9m/s (calm conditions)
Cloud Cover98%

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%9.5m/s
17:000%8.7m/s
18:000%7.2m/s
19:000%6.2m/s
20:000%5.7m/s
21:000%5.1m/s
22:000%4.7m/s
23:000%5m/s
Wed, Jul 8
24:000%5.1m/s
01:000%4.6m/s
02:000%3.8m/s
03:000%3.3m/s
04:000%2.8m/s
05:000%2.8m/s
06:000%3.1m/s
07:000%3.1m/s
08:000%2.7m/s
09:000%2.6m/s
10:000%1.2m/s
11:000%2.2m/s
12:000%2.6m/s
13:000%2.6m/s
14:000%2.5m/s
15:000%3.1m/s
16:000%4.1m/s
17:000%3.9m/s
18:000%3.3m/s
19:000%2.6m/s
20:000%2.4m/s
21:000%3.2m/s
22:000%3.8m/s
23:000%4.2m/s
Thu, Jul 9
24:000%4.1m/s
01:000%4m/s
02:000%4.1m/s
03:000%4.3m/s
04:000%4.3m/s
05:000%5.1m/s
06:000%5.1m/s
07:000%5.3m/s
08:000%5.5m/s
09:000%5.6m/s
10:000%5.1m/s
11:000%4.3m/s
12:000%3.7m/s
13:000%3.2m/s
14:000%3.3m/s
15:000%3m/s
16:000%3.1m/s
17:000%3.1m/s
18:000%3.5m/s
19:000%3m/s
20:000%2.6m/s
21:000%2.3m/s
22:000%2.5m/s
23:000%2.4m/s
Fri, Jul 10
24:000%1.7m/s
01:000%2.1m/s
02:000%1.9m/s
03:000%0.99m/s
04:000%1.6m/s
05:000%1.6m/s
06:000%1.2m/s
07:000%0.92m/s
08:000%0.59m/s
09:000%0.46m/s
10:000%0.79m/s
11:000%0.99m/s
12:000%1.4m/s
13:000%1.9m/s
14:000%1.9m/s
15:000%1.5m/s
16:000%1.9m/s
17:000%2.5m/s
18:000%2.8m/s
19:000%3.2m/s
20:000%2.7m/s
21:000%2.4m/s
22:000%2.4m/s
23:000%2.3m/s
Sat, Jul 11
24:000%2.2m/s
01:000%2.5m/s
02:000%2.8m/s
03:000%3.1m/s
04:000%2.9m/s
05:000%2.7m/s
06:000%2.5m/s
07:000%2.7m/s
08:000%2.9m/s
09:000%3.1m/s
10:000%2.8m/s
11:000%2.5m/s
12:000%2.1m/s
13:000%2.7m/s
14:000%3.2m/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
Wed, Jul 8 Sunrise 03:34 Sunset 22:39
17:00
8.8°C 9726°C 18°C - 98% 0.91kPa
18:00
8.7°C 9726°C 18°C - 30% 0.9kPa
19:00
9.3°C 9726°C 18°C - 53% 0.83kPa
20:00
10°C 9726°C 17°C - 100% 0.72kPa
21:00
10°C 9726°C 16°C - 100% 0.57kPa
22:00
11°C 9726°C 15°C - 100% 0.42kPa
23:00
11°C 9726°C 14°C - 100% 0.37kPa
Thu, Jul 9 Sunrise 03:34 Sunset 22:39
24:00
11°C 9726°C 14°C - 100% 0.3kPa
01:00
11°C 9726°C 14°C - 100% 0.25kPa
02:00
11°C 9726°C 13°C - 100% 0.23kPa
03:00
11°C 9726°C 14°C - 100% 0.2kPa
04:00
12°C 9726°C 13°C - 100% 0.19kPa
05:00
12°C 9726°C 14°C - 100% 0.18kPa
06:00
12°C 9726°C 13°C - 100% 0.14kPa
07:00
12°C 9726°C 13°C - 100% 0.13kPa
08:00
13°C 9726°C 14°C - 100% 0.14kPa
09:00
13°C 9726°C 14°C - 100% 0.12kPa
10:00
14°C 9726°C 14°C - 100% 0.07kPa
11:00
14°C 9726°C 14°C - 100% 0.04kPa
12:00
14°C 9726°C 15°C - 100% 0.04kPa
13:00
15°C 9726°C 15°C - 100% 0.03kPa
14:00
15°C 9726°C 16°C - 100% 0.04kPa
15:00
15°C 9726°C 16°C - 87% 0.08kPa
16:00
15°C 9726°C 18°C - 44% 0.32kPa
17:00
14°C 9726°C 18°C - 85% 0.51kPa
18:00
14°C 9726°C 18°C - 33% 0.46kPa
19:00
14°C 9726°C 18°C - 23% 0.48kPa
20:00
14°C 9726°C 18°C - 0% 0.44kPa
21:00
14°C 9726°C 17°C - 0% 0.3kPa
22:00
14°C 9726°C 15°C - 0% 0.17kPa
23:00
13°C 9726°C 15°C - 5% 0.14kPa
Fri, Jul 10 Sunrise 03:35 Sunset 22:38
24:00
13°C 9726°C 14°C - 100% 0.12kPa
01:00
13°C 9726°C 14°C - 100% 0.11kPa
02:00
12°C 9726°C 13°C - 93% 0.11kPa
03:00
12°C 9726°C 13°C - 100% 0.11kPa
04:00
12°C 9726°C 13°C - 100% 0.12kPa
05:00
12°C 9726°C 13°C - 100% 0.15kPa
06:00
12°C 9726°C 14°C - 100% 0.21kPa
07:00
12°C 9726°C 15°C - 100% 0.25kPa
08:00
12°C 9726°C 16°C - 8% 0.34kPa
09:00
12°C 9726°C 17°C - 6% 0.56kPa
10:00
12°C 9726°C 18°C - 62% 0.69kPa
11:00
12°C 9726°C 19°C - 46% 0.78kPa
12:00
11°C 9726°C 19°C - 45% 0.86kPa
13:00
11°C 9726°C 19°C - 82% 0.94kPa
14:00
11°C 9726°C 19°C - 100% 0.89kPa
15:00
12°C 9726°C 19°C - 77% 0.9kPa
16:00
12°C 9726°C 20°C - 88% 0.99kPa
17:00
12°C 9726°C 20°C - 100% 0.97kPa
18:00
13°C 9726°C 21°C - 78% 0.93kPa
19:00
13°C 9726°C 20°C - 23% 0.88kPa
20:00
13°C 9726°C 19°C - 100% 0.7kPa
21:00
13°C 9726°C 17°C - 100% 0.5kPa
22:00
14°C 6489°C 17°C - 86% 0.35kPa
23:00
14°C 3252°C 16°C - 72% 0.2kPa
Sat, Jul 11 Sunrise 03:37 Sunset 22:36
24:00
15°C 16°C 16°C - 57% 0.07kPa
01:00
15°C 16°C 17°C - 40% 0.18kPa
02:00
15°C 16°C 18°C - 22% 0.3kPa
03:00
15°C 16°C 19°C - 5% 0.44kPa
04:00
16°C 16°C 20°C - 5% 0.61kPa
05:00
16°C 16°C 22°C - 5% 0.8kPa
06:00
16°C 17°C 23°C - 5% 1kPa
07:00
15°C 17°C 24°C - 12% 1.2kPa
08:00
15°C 18°C 24°C - 19% 1.3kPa
09:00
15°C 18°C 25°C - 26% 1.5kPa
10:00
15°C 19°C 24°C - 45% 1.3kPa
11:00
16°C 19°C 24°C - 65% 1.1kPa
12:00
16°C 19°C 23°C - 84% 0.98kPa
13:00
16°C 19°C 23°C - 60% 0.89kPa
14:00
16°C 19°C 22°C - 35% 0.81kPa
15:00
17°C 19°C 22°C - 11% 0.73kPa
16:00
16°C 19°C 21°C - 7% 0.63kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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