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More Morning Frost in Southern Finland
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Rule Morning Frost

Helsinki - Morning Frost - Southern Finland

Helsingfors, 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 100% failing
Time Window 88% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature14.5°C
Dew Point7.1°C (moderate dew point)
Wind Speed6.9m/s (moderate winds)
Cloud Cover18%

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
Sat, May 23
16:00✕0%5.5m/s
17:00✕0%6.3m/s
18:00✕0%6.5m/s
19:00✕0%5.9m/s
20:00✕0%5.2m/s
21:00✕0%4.4m/s
22:00✕0%4.4m/s
23:00✕0%4.3m/s
Sun, May 24
24:00✕0%4m/s
01:00✕0%4.2m/s
02:00✕0%4.7m/s
03:00✓0%4.7m/s
04:00✓0%4.4m/s
05:00✓0%4.3m/s
06:00✕0%4.2m/s
07:00✕0%4.6m/s
08:00✕0%4.6m/s
09:00✕0%5.1m/s
10:00✕0%5.7m/s
11:00✕0%5.8m/s
12:00✕0%5.4m/s
13:00✕0%6m/s
14:00✕0%6.4m/s
15:00✕0%6.7m/s
16:00✕0%6.9m/s
17:00✕0%6.4m/s
18:00✕0%6m/s
19:00✕0%5.8m/s
20:00✕0%5.7m/s
21:00✕0%5.4m/s
22:00✕0%5.8m/s
23:00✕0%5.7m/s
Mon, May 25
24:00✕0%5.7m/s
01:00✕0%5.7m/s
02:00✕0%5m/s
03:00✓0%5.4m/s
04:00✓0%5.3m/s
05:00✓0%4.3m/s
06:00✕0%4.5m/s
07:00✕0%4.6m/s
08:00✕0%4.8m/s
09:00✕0%4.7m/s
10:00✕0%5.9m/s
11:00✕0%6.3m/s
12:00✕0%6.4m/s
13:00✕0%6.7m/s
14:00✕0%7.1m/s
15:00✕0%7.3m/s
16:00✕0%7m/s
17:00✕0%6.7m/s
18:00✕0%6.7m/s
19:00✕0%6.2m/s
20:00✕0%6.1m/s
21:00✕0%5.7m/s
22:00✕0%4.8m/s
23:00✕0%4.9m/s
Tue, May 26
24:00✕0%5.6m/s
01:00✕0%4.8m/s
02:00✕0%4.9m/s
03:00✓0%4.7m/s
04:00✓0%4.7m/s
05:00✓0%4.4m/s
06:00✕0%4.2m/s
07:00✕0%4.4m/s
08:00✕0%4.8m/s
09:00✕0%4.9m/s
10:00✕0%5.2m/s
11:00✕0%5.3m/s
12:00✕0%4.9m/s
13:00✕0%4.8m/s
14:00✕0%4m/s
15:00✕0%4.4m/s
16:00✕0%6m/s
17:00✕0%6.2m/s
18:00✕0%5.8m/s
19:00✕0%4.9m/s
20:00✕0%5.6m/s
21:00✕0%5m/s
22:00✕0%6.4m/s
23:00✕0%7.7m/s
Wed, May 27
24:00✕0%9.1m/s
01:00✕0%8.6m/s
02:00✕0%8.1m/s
03:00✓0%7.6m/s
04:00✓0%6.7m/s
05:00✓0%5.9m/s
06:00✕0%5m/s
07:00✕0%5.5m/s
08:00✕0%6m/s
09:00✕0%6.5m/s
10:00✕0%7.4m/s
11:00✕0%8.3m/s
12:00✕0%9.3m/s
13:00✕0%9.6m/s
14:00✕0%9.9m/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
Sun, May 24 Sunrise 04:22 Sunset 22:13
16:00
7.1°C 14°C 18°C - 18% 1.1kPa
17:00
7.1°C 15°C 18°C - 5% 1.1kPa
18:00
7.5°C 15°C 18°C - 2% 0.99kPa
19:00
7.5°C 15°C 17°C - 0% 0.86kPa
20:00
7.3°C 15°C 16°C - 0% 0.75kPa
21:00
7.2°C 15°C 15°C - 0% 0.65kPa
22:00
6.5°C 15°C 14°C - 2% 0.6kPa
23:00 ☾
6.6°C 14°C 13°C - 49% 0.51kPa
Mon, May 25 Sunrise 04:22 Sunset 22:13
24:00 ☾
6.4°C 14°C 12°C - 98% 0.46kPa
01:00 ☾
5.7°C 14°C 13°C - 100% 0.53kPa
02:00 ☾
5.5°C 14°C 12°C - 100% 0.53kPa
03:00 ☾
6.1°C 13°C 12°C - 100% 0.45kPa
04:00 ☾
6°C 13°C 12°C - 100% 0.47kPa
05:00
6.1°C 13°C 12°C - 100% 0.44kPa
06:00
5.7°C 13°C 12°C - 100% 0.47kPa
07:00
5.1°C 13°C 11°C - 100% 0.44kPa
08:00
4.8°C 12°C 10°C - 100% 0.38kPa
09:00
3.9°C 12°C 10°C - 100% 0.43kPa
10:00
2.6°C 12°C 13°C - 100% 0.77kPa
11:00
1.7°C 12°C 14°C - 17% 0.9kPa
12:00
0.8°C 13°C 15°C - 82% 1.1kPa
13:00
0°C 13°C 16°C - 5% 1.2kPa
14:00
-0.6°C 13°C 16°C - 8% 1.3kPa
15:00
-0.5°C 13°C 17°C - 5% 1.3kPa
16:00
0.2°C 14°C 17°C - 4% 1.3kPa
17:00
0.9°C 14°C 17°C - 0% 1.3kPa
18:00
1.5°C 14°C 16°C - 0% 1.2kPa
19:00
2°C 14°C 15°C - 1% 1kPa
20:00
2.4°C 14°C 14°C - 3% 0.87kPa
21:00
2.4°C 14°C 13°C - 0% 0.75kPa
22:00
2.1°C 14°C 12°C - 4% 0.65kPa
23:00 ☾
2.5°C 13°C 11°C - 1% 0.57kPa
Tue, May 26 Sunrise 04:20 Sunset 22:15
24:00 ☾
2.8°C 13°C 10°C - 39% 0.5kPa
01:00 ☾
3.1°C 13°C 9.4°C - 92% 0.42kPa
02:00 ☾
3.2°C 12°C 9.1°C - 58% 0.38kPa
03:00 ☾
3.2°C 12°C 8.4°C - 16% 0.34kPa
04:00 ☾
3.2°C 12°C 8°C - 2% 0.3kPa
05:00
3.3°C 11°C 7.7°C - 1% 0.28kPa
06:00
3.6°C 11°C 8.2°C - 2% 0.3kPa
07:00
4.1°C 11°C 9.7°C - 0% 0.38kPa
08:00
4°C 11°C 12°C - 0% 0.54kPa
09:00
3.5°C 11°C 13°C - 2% 0.73kPa
10:00
3.2°C 11°C 15°C - 10% 0.88kPa
11:00
3.3°C 12°C 15°C - 8% 0.96kPa
12:00
3°C 12°C 16°C - 96% 1.1kPa
13:00
3.3°C 12°C 16°C - 100% 1kPa
14:00
3.5°C 12°C 15°C - 100% 0.91kPa
15:00
2.6°C 13°C 16°C - 98% 1.1kPa
16:00
1°C 13°C 18°C - 48% 1.4kPa
17:00
0.9°C 13°C 17°C - 12% 1.3kPa
18:00
2.1°C 14°C 17°C - 90% 1.2kPa
19:00
2.9°C 14°C 16°C - 59% 1kPa
20:00
3.8°C 14°C 14°C - 100% 0.84kPa
21:00
3.7°C 14°C 13°C - 100% 0.68kPa
22:00
4.6°C 3251°C 11°C - 100% 0.49kPa
23:00 ☾
5.1°C 6488°C 9.6°C - 100% 0.32kPa
Wed, May 27 Sunrise 04:18 Sunset 22:17
24:00 ☾
5.3°C 9726°C 8.1°C - 100% 0.19kPa
01:00 ☾
5.4°C 9726°C 8.4°C - 93% 0.2kPa
02:00 ☾
5.6°C 9726°C 8.7°C - 86% 0.22kPa
03:00 ☾
5.7°C 9726°C 9.1°C - 78% 0.23kPa
04:00 ☾
5.1°C 9726°C 9.5°C - 54% 0.31kPa
05:00
4.4°C 9726°C 9.9°C - 30% 0.38kPa
06:00
3.7°C 9726°C 10°C - 5% 0.46kPa
07:00
3.2°C 9726°C 11°C - 37% 0.52kPa
08:00
2.7°C 9726°C 11°C - 68% 0.57kPa
09:00
2.1°C 9726°C 11°C - 100% 0.63kPa
10:00
1.9°C 9726°C 12°C - 100% 0.66kPa
11:00
1.8°C 9726°C 12°C - 100% 0.69kPa
12:00
1.6°C 9726°C 12°C - 100% 0.73kPa
13:00
1.2°C 9726°C 12°C - 88% 0.7kPa
14:00
0.9°C 9726°C 11°C - 75% 0.68kPa
15:00
0.6°C 9726°C 11°C - 62% 0.65kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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