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Rule Morning Frost

Vesijärvi - Morning Frost - Southern Finland

Lahti, Päijänne Tavastia, 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
Time Window 88% failing
Wind Speed 76% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature12.8°C
Dew Point10.7°C (moderate dew point)
Wind Speed2.6m/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
16:00✕0%3.9m/s
17:00✕0%2.7m/s
18:00✕0%2.5m/s
19:00✕0%2.1m/s
20:00✕0%1.6m/s
21:00✕0%1.4m/s
22:00✕0%1.5m/s
23:00✕0%1.2m/s
Wed, Jul 8
24:00✕0%1.1m/s
01:00✕0%0.5m/s
02:00✕0%0.62m/s
03:00✓0%0.82m/s
04:00✓0%1m/s
05:00✓0%1.2m/s
06:00✕0%0.51m/s
07:00✕0%0.49m/s
08:00✕0%1m/s
09:00✕0%1.1m/s
10:00✕0%2.1m/s
11:00✕0%2.4m/s
12:00✕0%2.3m/s
13:00✕0%2.3m/s
14:00✕0%2.3m/s
15:00✕0%2.2m/s
16:00✕0%2.3m/s
17:00✕0%2.6m/s
18:00✕0%2m/s
19:00✕0%0.26m/s
20:00✕0%1.9m/s
21:00✕0%2.3m/s
22:00✕0%2.8m/s
23:00✕0%2.9m/s
Thu, Jul 9
24:00✕0%3.7m/s
01:00✕0%3.3m/s
02:00✕0%3.8m/s
03:00✓0%4.5m/s
04:00✓0%4.5m/s
05:00✓0%4.5m/s
06:00✕0%4.4m/s
07:00✕0%4.6m/s
08:00✕0%5.3m/s
09:00✕0%5.1m/s
10:00✕0%5.2m/s
11:00✕0%5.6m/s
12:00✕0%4.9m/s
13:00✕0%4.2m/s
14:00✕0%3.4m/s
15:00✕0%2.8m/s
16:00✕0%2.5m/s
17:00✕0%3.1m/s
18:00✕0%3m/s
19:00✕0%2.5m/s
20:00✕0%2.3m/s
21:00✕0%1.9m/s
22:00✕0%1.5m/s
23:00✕0%1.2m/s
Fri, Jul 10
24:00✕0%0.96m/s
01:00✕0%1m/s
02:00✕0%1.1m/s
03:00✓0%1.4m/s
04:00✓0%1.4m/s
05:00✓0%1.5m/s
06:00✕0%1.4m/s
07:00✕0%1.2m/s
08:00✕0%1.5m/s
09:00✕0%1.7m/s
10:00✕0%2m/s
11:00✕0%2.3m/s
12:00✕0%2.1m/s
13:00✕0%2.4m/s
14:00✕0%2.5m/s
15:00✕0%2.7m/s
16:00✕0%2.8m/s
17:00✕0%3.1m/s
18:00✕0%3.2m/s
19:00✕0%2.5m/s
20:00✕0%1.6m/s
21:00✕0%0.75m/s
22:00✕0%1.1m/s
23:00✕0%1.4m/s
Sat, Jul 11
24:00✕0%1.8m/s
01:00✕0%1.8m/s
02:00✕0%1.9m/s
03:00✓0%2m/s
04:00✓0%2.3m/s
05:00✓0%2.6m/s
06:00✕0%2.9m/s
07:00✕0%2.7m/s
08:00✕0%2.5m/s
09:00✕0%2.2m/s
10:00✕0%1.9m/s
11:00✕0%1.5m/s
12:00✕0%1.2m/s
13:00✕0%1.2m/s
14:00✕0%1.3m/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 03:58 Sunset 22:45
17:00
11°C 13°C 16°C - 100% 0.58kPa
18:00
12°C 13°C 15°C - 100% 0.3kPa
19:00
13°C 13°C 15°C - 100% 0.3kPa
20:00
12°C 13°C 15°C - 100% 0.27kPa
21:00
12°C 13°C 14°C - 98% 0.21kPa
22:00
11°C 13°C 13°C - 100% 0.18kPa
23:00 ☾
10°C 13°C 12°C - 96% 0.12kPa
Thu, Jul 9 Sunrise 03:58 Sunset 22:45
24:00 ☾
9.9°C 13°C 12°C - 100% 0.18kPa
01:00 ☾
9.5°C 13°C 12°C - 100% 0.21kPa
02:00 ☾
9.2°C 12°C 12°C - 100% 0.23kPa
03:00 ☾
9.2°C 12°C 12°C - 100% 0.28kPa
04:00 ☾
8.6°C 12°C 12°C - 100% 0.33kPa
05:00
8.4°C 12°C 12°C - 100% 0.34kPa
06:00
9.8°C 12°C 11°C - 100% 0.11kPa
07:00
10°C 12°C 11°C - 100% 0.07kPa
08:00
10°C 12°C 11°C - 100% 0.07kPa
09:00
11°C 12°C 12°C - 100% 0.07kPa
10:00
11°C 12°C 12°C - 100% 0.05kPa
11:00
11°C 12°C 12°C - 100% 0.04kPa
12:00
12°C 12°C 12°C - 100% 0.04kPa
13:00
12°C 12°C 12°C - 100% 0.03kPa
14:00
12°C 12°C 12°C - 100% 0.03kPa
15:00
13°C 12°C 13°C - 100% 0.02kPa
16:00
15°C 12°C 15°C - 57% 0.06kPa
17:00
16°C 12°C 17°C - 43% 0.19kPa
18:00
16°C 12°C 17°C - 10% 0.16kPa
19:00
16°C 12°C 17°C - 6% 0.14kPa
20:00
16°C 13°C 17°C - 4% 0.14kPa
21:00
15°C 13°C 16°C - 19% 0.12kPa
22:00
14°C 13°C 14°C - 12% 0.08kPa
23:00 ☾
13°C 13°C 13°C - 0% 0.07kPa
Fri, Jul 10 Sunrise 04:00 Sunset 22:43
24:00 ☾
12°C 13°C 12°C - 0% 0.07kPa
01:00 ☾
11°C 12°C 12°C - 0% 0.08kPa
02:00 ☾
10°C 12°C 11°C - 1% 0.08kPa
03:00 ☾
9.6°C 12°C 11°C - 6% 0.08kPa
04:00 ☾
9.2°C 12°C 10°C - 100% 0.07kPa
05:00
9.5°C 12°C 10°C - 100% 0.07kPa
06:00
11°C 12°C 12°C - 100% 0.08kPa
07:00
12°C 12°C 13°C - 100% 0.1kPa
08:00
12°C 12°C 14°C - 100% 0.16kPa
09:00
13°C 12°C 16°C - 100% 0.31kPa
10:00
12°C 12°C 18°C - 19% 0.65kPa
11:00
11°C 12°C 20°C - 0% 1kPa
12:00
10°C 13°C 21°C - 52% 1.2kPa
13:00
10°C 13°C 22°C - 100% 1.4kPa
14:00
9.7°C 13°C 22°C - 100% 1.5kPa
15:00
9.6°C 14°C 22°C - 25% 1.4kPa
16:00
9.4°C 14°C 23°C - 19% 1.6kPa
17:00
9.7°C 14°C 23°C - 11% 1.6kPa
18:00
9.9°C 15°C 22°C - 89% 1.5kPa
19:00
11°C 15°C 22°C - 100% 1.3kPa
20:00
13°C 15°C 20°C - 100% 0.89kPa
21:00
12°C 15°C 18°C - 100% 0.64kPa
22:00
12°C 15°C 17°C - 100% 0.48kPa
23:00 ☾
12°C 14°C 15°C - 100% 0.35kPa
Sat, Jul 11 Sunrise 04:01 Sunset 22:42
24:00 ☾
12°C 14°C 14°C - 100% 0.23kPa
01:00 ☾
12°C 14°C 15°C - 100% 0.28kPa
02:00 ☾
12°C 14°C 16°C - 100% 0.33kPa
03:00 ☾
13°C 14°C 16°C - 100% 0.39kPa
04:00 ☾
13°C 14°C 18°C - 99% 0.52kPa
05:00
14°C 14°C 20°C - 99% 0.67kPa
06:00
15°C 15°C 22°C - 98% 0.85kPa
07:00
16°C 15°C 21°C - 98% 0.75kPa
08:00
16°C 15°C 21°C - 99% 0.66kPa
09:00
17°C 15°C 21°C - 99% 0.57kPa
10:00
18°C 15°C 22°C - 99% 0.53kPa
11:00
19°C 15°C 22°C - 100% 0.48kPa
12:00
20°C 16°C 23°C - 100% 0.43kPa
13:00
19°C 16°C 22°C - 82% 0.35kPa
14:00
19°C 16°C 20°C - 64% 0.28kPa
15:00
18°C 16°C 19°C - 46% 0.21kPa
16:00
17°C 16°C 19°C - 55% 0.18kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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