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Rule Morning Frost

Nuuksio - Morning Frost - Southern Finland

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 93% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature12.0°C
Dew Point11.6°C (moderate dew point)
Wind Speed1.4m/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%4m/s
17:000%3.2m/s
18:000%2.6m/s
19:000%2.7m/s
20:000%2.5m/s
21:000%1.9m/s
22:000%1.7m/s
23:000%1.3m/s
Wed, Jul 8
24:000%1.3m/s
01:000%1.1m/s
02:000%1.2m/s
03:000%1.2m/s
04:000%1.5m/s
05:000%1.6m/s
06:000%1.8m/s
07:000%2m/s
08:000%2.1m/s
09:000%2m/s
10:000%1.9m/s
11:000%2.1m/s
12:000%2m/s
13:000%2.2m/s
14:000%1.1m/s
15:000%0.43m/s
16:000%0.86m/s
17:000%1.4m/s
18:000%2.2m/s
19:000%3.3m/s
20:000%3.2m/s
21:000%2.5m/s
22:000%2.5m/s
23:000%3m/s
Thu, Jul 9
24:000%3.6m/s
01:000%3.8m/s
02:000%4.5m/s
03:000%4.5m/s
04:000%4.6m/s
05:000%5m/s
06:000%5.2m/s
07:000%5.2m/s
08:000%5.7m/s
09:000%6.1m/s
10:000%5.8m/s
11:000%5.3m/s
12:000%4.6m/s
13:000%4m/s
14:000%3.9m/s
15:000%4.1m/s
16:000%3.8m/s
17:000%3.3m/s
18:000%3.1m/s
19:000%2.6m/s
20:000%2.6m/s
21:000%2.5m/s
22:000%2.1m/s
23:000%2.1m/s
Fri, Jul 10
24:000%2m/s
01:000%2.1m/s
02:000%2.3m/s
03:000%2.4m/s
04:000%2.3m/s
05:000%2.1m/s
06:000%2m/s
07:000%1.9m/s
08:000%2.2m/s
09:000%2.7m/s
10:000%3.5m/s
11:000%3.5m/s
12:000%3.8m/s
13:000%4.2m/s
14:000%4.2m/s
15:000%4.1m/s
16:000%4.2m/s
17:000%3.7m/s
18:000%3.5m/s
19:000%3.1m/s
20:000%2m/s
21:000%1.4m/s
22:000%1.7m/s
23:000%2.1m/s
Sat, Jul 11
24:000%2.4m/s
01:000%2.4m/s
02:000%2.3m/s
03:000%2.3m/s
04:000%2.2m/s
05:000%2m/s
06:000%1.8m/s
07:000%1.7m/s
08:000%1.5m/s
09:000%1.3m/s
10:000%1.7m/s
11:000%2.1m/s
12:000%2.5m/s
13:000%2.3m/s
14:000%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 04:10 Sunset 22:42
17:00
12°C 12°C 15°C - 100% 0.35kPa
18:00
12°C 12°C 14°C - 100% 0.16kPa
19:00
12°C 12°C 13°C - 100% 0.16kPa
20:00
12°C 12°C 14°C - 100% 0.2kPa
21:00
11°C 12°C 13°C - 100% 0.19kPa
22:00
11°C 12°C 13°C - 100% 0.15kPa
23:00
11°C 12°C 12°C - 100% 0.13kPa
Thu, Jul 9 Sunrise 04:10 Sunset 22:42
24:00
10°C 12°C 12°C - 100% 0.19kPa
01:00
9.9°C 12°C 13°C - 100% 0.25kPa
02:00
9.6°C 12°C 13°C - 100% 0.28kPa
03:00
9.5°C 12°C 13°C - 100% 0.3kPa
04:00
10°C 12°C 12°C - 100% 0.2kPa
05:00
11°C 12°C 12°C - 100% 0.14kPa
06:00
10°C 12°C 12°C - 100% 0.14kPa
07:00
10°C 12°C 12°C - 100% 0.14kPa
08:00
11°C 12°C 12°C - 100% 0.08kPa
09:00
11°C 12°C 12°C - 100% 0.06kPa
10:00
11°C 12°C 12°C - 100% 0.05kPa
11:00
11°C 12°C 12°C - 100% 0.06kPa
12:00
12°C 12°C 12°C - 100% 0.05kPa
13:00
12°C 12°C 12°C - 100% 0.04kPa
14:00
12°C 12°C 13°C - 100% 0.03kPa
15:00
13°C 12°C 13°C - 100% 0.05kPa
16:00
13°C 12°C 13°C - 100% 0.06kPa
17:00
13°C 12°C 14°C - 100% 0.1kPa
18:00
13°C 12°C 15°C - 95% 0.21kPa
19:00
13°C 12°C 16°C - 64% 0.27kPa
20:00
14°C 12°C 17°C - 5% 0.33kPa
21:00
14°C 12°C 15°C - 32% 0.18kPa
22:00
13°C 12°C 14°C - 0% 0.05kPa
23:00
12°C 12°C 13°C - 1% 0.04kPa
Fri, Jul 10 Sunrise 04:12 Sunset 22:41
24:00
12°C 12°C 12°C - 0% 0.05kPa
01:00
11°C 12°C 11°C - 0% 0.07kPa
02:00
10°C 12°C 11°C - 0% 0.07kPa
03:00
9.9°C 12°C 11°C - 5% 0.05kPa
04:00
9.8°C 12°C 10°C - 22% 0.04kPa
05:00
10°C 12°C 11°C - 6% 0.04kPa
06:00
11°C 12°C 12°C - 100% 0.07kPa
07:00
12°C 12°C 13°C - 100% 0.13kPa
08:00
13°C 12°C 15°C - 100% 0.23kPa
09:00
12°C 12°C 17°C - 81% 0.49kPa
10:00
11°C 12°C 19°C - 25% 0.84kPa
11:00
10°C 12°C 20°C - 0% 1.1kPa
12:00
10°C 13°C 21°C - 18% 1.2kPa
13:00
10°C 13°C 21°C - 100% 1.3kPa
14:00
10°C 13°C 21°C - 100% 1.2kPa
15:00
10°C 14°C 21°C - 96% 1.2kPa
16:00
10°C 14°C 21°C - 48% 1.2kPa
17:00
10°C 14°C 21°C - 5% 1.2kPa
18:00
10°C 14°C 21°C - 9% 1.2kPa
19:00
10°C 15°C 21°C - 62% 1.2kPa
20:00
12°C 15°C 20°C - 94% 0.89kPa
21:00
13°C 15°C 17°C - 100% 0.52kPa
22:00
13°C 15°C 16°C - 100% 0.34kPa
23:00
13°C 14°C 15°C - 100% 0.17kPa
Sat, Jul 11 Sunrise 04:13 Sunset 22:39
24:00
14°C 14°C 14°C - 100% 0.03kPa
01:00
14°C 14°C 14°C - 100% 0.05kPa
02:00
14°C 14°C 15°C - 99% 0.08kPa
03:00
14°C 14°C 15°C - 99% 0.1kPa
04:00
14°C 14°C 15°C - 99% 0.14kPa
05:00
14°C 14°C 16°C - 100% 0.18kPa
06:00
14°C 14°C 16°C - 100% 0.22kPa
07:00
15°C 14°C 17°C - 100% 0.32kPa
08:00
15°C 14°C 18°C - 100% 0.44kPa
09:00
15°C 14°C 19°C - 100% 0.57kPa
10:00
16°C 15°C 20°C - 94% 0.56kPa
11:00
17°C 15°C 21°C - 88% 0.53kPa
12:00
19°C 15°C 22°C - 82% 0.51kPa
13:00
19°C 15°C 21°C - 88% 0.39kPa
14:00
18°C 15°C 20°C - 94% 0.29kPa
15:00
18°C 15°C 19°C - 100% 0.2kPa
16:00
17°C 15°C 19°C - 82% 0.15kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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