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Rule Morning Frost

Liesjärvi - Morning Frost - Southern Finland

Liesjärven Kansallispuisto, Kanta-Häme, 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 Temperature14.0°C
Dew Point6.5°C (moderate dew point)
Wind Speed6.9m/s (moderate winds)
Cloud Cover6%

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
Sun, May 24
07:00✕0%4.6m/s
08:00✕0%5m/s
09:00✕0%5.5m/s
10:00✕0%6.3m/s
11:00✕0%6.4m/s
12:00✕0%5.9m/s
13:00✕0%6m/s
14:00✕0%7.5m/s
15:00✕0%6.5m/s
16:00✕0%6.9m/s
17:00✕0%7.3m/s
18:00✕0%6.6m/s
19:00✕0%6.3m/s
20:00✕0%6.4m/s
21:00✕0%5.8m/s
22:00✕0%5.4m/s
23:00✕0%5.2m/s
Mon, May 25
24:00✕0%5.5m/s
01:00✕0%5.2m/s
02:00✕0%5m/s
03:00✓0%5.3m/s
04:00✓0%4.7m/s
05:00✓0%4.9m/s
06:00✕0%4.4m/s
07:00✕0%4.3m/s
08:00✕0%5m/s
09:00✕0%5.5m/s
10:00✕0%6.4m/s
11:00✕0%6.6m/s
12:00✕0%7m/s
13:00✕0%7.5m/s
14:00✕0%7.8m/s
15:00✕0%7.8m/s
16:00✕0%7.7m/s
17:00✕0%7.3m/s
18:00✕0%6.7m/s
19:00✕0%6.3m/s
20:00✕0%5.7m/s
21:00✕0%5m/s
22:00✕0%4.7m/s
23:00✕0%4.7m/s
Tue, May 26
24:00✕0%4.3m/s
01:00✕0%4m/s
02:00✕0%3.8m/s
03:00✓0%4.1m/s
04:00✓0%3.9m/s
05:00✓0%3.9m/s
06:00✕0%4.1m/s
07:00✕0%4.1m/s
08:00✕0%4.4m/s
09:00✕0%4.8m/s
10:00✕0%4.8m/s
11:00✕0%5.1m/s
12:00✕0%6.1m/s
13:00✕0%6.6m/s
14:00✕0%6.9m/s
15:00✕0%7.2m/s
16:00✕0%6.8m/s
17:00✕0%6.2m/s
18:00✕0%6m/s
19:00✕0%5.1m/s
20:00✕0%5.9m/s
21:00✕0%4.9m/s
22:00✕0%4.8m/s
23:00✕0%4.6m/s
Wed, May 27
24:00✕0%4.5m/s
01:00✕0%4.7m/s
02:00✕0%4.9m/s
03:00✓0%5.2m/s
04:00✓0%5.4m/s
05:00✓0%5.6m/s
06:00✕0%5.7m/s
07:00✕0%6m/s
08:00✕0%6.3m/s
09:00✕0%6.5m/s
10:00✕0%6.5m/s
11:00✕0%6.4m/s
12:00✕0%6.3m/s
13:00✕0%6.2m/s
14:00✕0%6.1m/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 22:21
16:00
6.5°C 14°C 17°C - 6% 0.95kPa
17:00
6.4°C 14°C 17°C - 62% 0.95kPa
18:00
6.6°C 14°C 17°C - 0% 0.92kPa
19:00
6.6°C 14°C 16°C - 0% 0.88kPa
20:00
6.2°C 14°C 15°C - 0% 0.8kPa
21:00
6.4°C 14°C 14°C - 0% 0.64kPa
22:00
6°C 14°C 13°C - 25% 0.51kPa
23:00 ☾
5.7°C 14°C 12°C - 98% 0.48kPa
Mon, May 25 Sunrise 04:22 Sunset 22:21
24:00 ☾
4.8°C 14°C 12°C - 100% 0.56kPa
01:00 ☾
4.8°C 13°C 12°C - 100% 0.55kPa
02:00 ☾
5.1°C 13°C 11°C - 100% 0.44kPa
03:00 ☾
5°C 13°C 11°C - 99% 0.48kPa
04:00 ☾
5.3°C 13°C 11°C - 100% 0.45kPa
05:00
4.9°C 12°C 10°C - 100% 0.37kPa
06:00
5.3°C 12°C 8.3°C - 100% 0.2kPa
07:00
4.2°C 12°C 8.2°C - 100% 0.26kPa
08:00
4.5°C 12°C 9.8°C - 100% 0.37kPa
09:00
3.9°C 11°C 11°C - 97% 0.48kPa
10:00
1.3°C 11°C 12°C - 61% 0.73kPa
11:00
-0.1°C 12°C 13°C - 5% 0.93kPa
12:00
-1°C 12°C 14°C - 5% 1.1kPa
13:00
-1.6°C 12°C 15°C - 5% 1.1kPa
14:00
-1.7°C 12°C 15°C - 5% 1.2kPa
15:00
-1.8°C 13°C 15°C - 4% 1.2kPa
16:00
-1.1°C 13°C 16°C - 5% 1.2kPa
17:00
-0.4°C 13°C 16°C - 5% 1.2kPa
18:00
1°C 13°C 15°C - 0% 1.1kPa
19:00
1.6°C 13°C 15°C - 0% 0.97kPa
20:00
1.8°C 13°C 14°C - 4% 0.85kPa
21:00
1.8°C 13°C 12°C - 18% 0.75kPa
22:00
1.8°C 13°C 11°C - 1% 0.61kPa
23:00 ☾
2.5°C 13°C 9.5°C - 85% 0.46kPa
Tue, May 26 Sunrise 04:20 Sunset 22:24
24:00 ☾
2.9°C 12°C 8.4°C - 99% 0.35kPa
01:00 ☾
2.7°C 12°C 8.2°C - 88% 0.35kPa
02:00 ☾
2.8°C 11°C 7.3°C - 1% 0.28kPa
03:00 ☾
2.7°C 11°C 6.9°C - 1% 0.25kPa
04:00 ☾
2.8°C 11°C 6.9°C - 0% 0.24kPa
05:00
3.1°C 10°C 6.7°C - 1% 0.22kPa
06:00
3.2°C 10°C 8.2°C - 2% 0.32kPa
07:00
3.4°C 10°C 9.7°C - 6% 0.43kPa
08:00
3.2°C 10°C 11°C - 58% 0.56kPa
09:00
3.1°C 10°C 12°C - 5% 0.67kPa
10:00
2.5°C 11°C 14°C - 5% 0.84kPa
11:00
2.4°C 11°C 15°C - 28% 0.98kPa
12:00
2.5°C 11°C 16°C - 35% 1.1kPa
13:00
1.4°C 12°C 16°C - 47% 1.2kPa
14:00
0.3°C 12°C 17°C - 7% 1.3kPa
15:00
-0.1°C 12°C 16°C - 6% 1.2kPa
16:00
0.3°C 13°C 16°C - 38% 1.2kPa
17:00
1.3°C 13°C 16°C - 72% 1.1kPa
18:00
2.6°C 13°C 15°C - 100% 0.98kPa
19:00
2.6°C 13°C 13°C - 10% 0.76kPa
20:00
2.8°C 13°C 13°C - 100% 0.76kPa
21:00
2.7°C 13°C 12°C - 100% 0.62kPa
22:00
4.1°C 12°C 10°C - 99% 0.42kPa
23:00 ☾
5°C 11°C 8.7°C - 98% 0.26kPa
Wed, May 27 Sunrise 04:18 Sunset 22:26
24:00 ☾
5.6°C 10°C 7.4°C - 96% 0.12kPa
01:00 ☾
5.3°C 10°C 8.1°C - 94% 0.19kPa
02:00 ☾
4.9°C 9.9°C 8.9°C - 92% 0.27kPa
03:00 ☾
4.3°C 9.8°C 9.7°C - 90% 0.37kPa
04:00 ☾
3°C 10°C 11°C - 93% 0.57kPa
05:00
1°C 10°C 13°C - 97% 0.82kPa
06:00
-2.1°C 10°C 14°C - 100% 1.1kPa
07:00
-2.4°C 11°C 14°C - 100% 1.1kPa
08:00
-2.7°C 11°C 15°C - 100% 1.2kPa
09:00
-2.9°C 11°C 15°C - 100% 1.2kPa
10:00
-3°C 11°C 15°C - 100% 1.2kPa
11:00
-3°C 12°C 14°C - 100% 1.1kPa
12:00
-3°C 12°C 14°C - 100% 1.1kPa
13:00
-3.5°C 12°C 13°C - 68% 1.1kPa
14:00
-4.1°C 12°C 12°C - 37% 0.96kPa
15:00
-4.7°C 12°C 11°C - 5% 0.89kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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