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Rule Morning Frost

Repovesi - Morning Frost - Southern Finland

Repovesi Nationalpark, Kymenlaakso, 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 83% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature13.2°C
Dew Point8.4°C (moderate dew point)
Wind Speed2.0m/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%4.6m/s
17:00✕0%4.5m/s
18:00✕0%3.4m/s
19:00✕0%3.4m/s
20:00✕0%3m/s
21:00✕0%2.2m/s
22:00✕0%1.9m/s
23:00✕0%1.9m/s
Wed, Jul 8
24:00✕0%1.5m/s
01:00✕0%1.3m/s
02:00✕0%1.3m/s
03:00✓0%0.93m/s
04:00✓0%1.2m/s
05:00✓0%1.3m/s
06:00✕0%1.1m/s
07:00✕0%1.1m/s
08:00✕0%0.98m/s
09:00✕0%1.1m/s
10:00✕0%1.2m/s
11:00✕0%1.4m/s
12:00✕0%1.6m/s
13:00✕0%1.8m/s
14:00✕0%2.3m/s
15:00✕0%3m/s
16:00✕0%2.4m/s
17:00✕0%2m/s
18:00✕0%2.3m/s
19:00✕0%2.4m/s
20:00✕0%2.3m/s
21:00✕0%2.4m/s
22:00✕0%2.8m/s
23:00✕0%3m/s
Thu, Jul 9
24:00✕0%3.3m/s
01:00✕0%3.4m/s
02:00✕0%3.9m/s
03:00✓0%4.1m/s
04:00✓0%3.8m/s
05:00✓0%4.4m/s
06:00✕0%4.3m/s
07:00✕0%4.5m/s
08:00✕0%4.8m/s
09:00✕0%5m/s
10:00✕0%4.7m/s
11:00✕0%4.4m/s
12:00✕0%4m/s
13:00✕0%3.6m/s
14:00✕0%3.3m/s
15:00✕0%3.6m/s
16:00✕0%3.2m/s
17:00✕0%2.6m/s
18:00✕0%3m/s
19:00✕0%2.6m/s
20:00✕0%2.2m/s
21:00✕0%1.6m/s
22:00✕0%1.5m/s
23:00✕0%1.6m/s
Fri, Jul 10
24:00✕0%1.4m/s
01:00✕0%1.1m/s
02:00✕0%1.1m/s
03:00✓0%1.3m/s
04:00✓0%1.4m/s
05:00✓0%1.5m/s
06:00✕0%1.3m/s
07:00✕0%1.2m/s
08:00✕0%1.4m/s
09:00✕0%1.4m/s
10:00✕0%1.9m/s
11:00✕0%2.3m/s
12:00✕0%2m/s
13:00✕0%2.4m/s
14:00✕0%2.7m/s
15:00✕0%2.8m/s
16:00✕0%2.8m/s
17:00✕0%2.3m/s
18:00✕0%2.4m/s
19:00✕0%1.9m/s
20:00✕0%1.9m/s
21:00✕0%1.3m/s
22:00✕0%1.5m/s
23:00✕0%1.7m/s
Sat, Jul 11
24:00✕0%1.9m/s
01:00✕0%2.2m/s
02:00✕0%2.5m/s
03:00✓0%2.8m/s
04:00✓0%2.8m/s
05:00✓0%2.8m/s
06:00✕0%2.9m/s
07:00✕0%3m/s
08:00✕0%3m/s
09:00✕0%3.1m/s
10:00✕0%2.6m/s
11:00✕0%2.1m/s
12:00✕0%1.6m/s
13:00✕0%1.7m/s
14:00✕0%1.8m/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 03:51 Sunset 22:42
17:00
8.4°C 13°C 18°C - 100% 0.94kPa
18:00
7.9°C 13°C 18°C - 100% 1kPa
19:00
8.3°C 13°C 17°C - 100% 0.84kPa
20:00
9.3°C 14°C 16°C - 100% 0.69kPa
21:00
9.9°C 14°C 15°C - 100% 0.54kPa
22:00
9.9°C 14°C 14°C - 100% 0.42kPa
23:00 ☾
9.5°C 13°C 13°C - 100% 0.29kPa
Thu, Jul 9 Sunrise 03:51 Sunset 22:42
24:00 ☾
9.2°C 13°C 12°C - 100% 0.26kPa
01:00 ☾
8.8°C 13°C 12°C - 100% 0.31kPa
02:00 ☾
8.5°C 13°C 12°C - 100% 0.32kPa
03:00 ☾
8.5°C 13°C 12°C - 100% 0.33kPa
04:00
8.5°C 13°C 12°C - 100% 0.33kPa
05:00
9.4°C 13°C 12°C - 100% 0.18kPa
06:00
10°C 13°C 12°C - 100% 0.12kPa
07:00
10°C 13°C 12°C - 100% 0.14kPa
08:00
11°C 13°C 12°C - 100% 0.1kPa
09:00
11°C 13°C 12°C - 100% 0.07kPa
10:00
12°C 13°C 12°C - 100% 0.05kPa
11:00
12°C 12°C 12°C - 100% 0.04kPa
12:00
12°C 12°C 13°C - 100% 0.04kPa
13:00
13°C 12°C 14°C - 100% 0.03kPa
14:00
14°C 12°C 15°C - 95% 0.04kPa
15:00
15°C 13°C 17°C - 100% 0.13kPa
16:00
15°C 13°C 16°C - 98% 0.11kPa
17:00
16°C 13°C 17°C - 19% 0.12kPa
18:00
16°C 13°C 18°C - 12% 0.31kPa
19:00
16°C 13°C 18°C - 3% 0.31kPa
20:00
15°C 13°C 18°C - 5% 0.26kPa
21:00
15°C 13°C 17°C - 0% 0.19kPa
22:00
14°C 13°C 15°C - 0% 0.12kPa
23:00 ☾
13°C 13°C 13°C - 0% 0.08kPa
Fri, Jul 10 Sunrise 03:53 Sunset 22:41
24:00 ☾
11°C 13°C 12°C - 0% 0.1kPa
01:00 ☾
10°C 13°C 12°C - 4% 0.11kPa
02:00 ☾
9.6°C 13°C 11°C - 76% 0.11kPa
03:00 ☾
9.3°C 13°C 11°C - 100% 0.11kPa
04:00
9.3°C 13°C 11°C - 100% 0.11kPa
05:00
9.8°C 13°C 11°C - 100% 0.11kPa
06:00
11°C 12°C 12°C - 100% 0.13kPa
07:00
12°C 12°C 13°C - 100% 0.15kPa
08:00
12°C 12°C 15°C - 100% 0.25kPa
09:00
12°C 13°C 16°C - 37% 0.42kPa
10:00
11°C 13°C 19°C - 5% 0.87kPa
11:00
9.9°C 13°C 20°C - 4% 1.1kPa
12:00
9.6°C 13°C 21°C - 100% 1.4kPa
13:00
9.3°C 14°C 22°C - 100% 1.5kPa
14:00
9.3°C 14°C 22°C - 49% 1.5kPa
15:00
9.4°C 15°C 23°C - 91% 1.6kPa
16:00
9.4°C 15°C 23°C - 21% 1.7kPa
17:00
9.6°C 15°C 23°C - 81% 1.7kPa
18:00
10°C 16°C 23°C - 78% 1.6kPa
19:00
12°C 16°C 21°C - 100% 1.1kPa
20:00
13°C 16°C 20°C - 100% 0.78kPa
21:00
14°C 16°C 18°C - 99% 0.55kPa
22:00
13°C 16°C 17°C - 94% 0.48kPa
23:00 ☾
13°C 16°C 17°C - 90% 0.42kPa
Sat, Jul 11 Sunrise 03:54 Sunset 22:39
24:00 ☾
12°C 15°C 16°C - 85% 0.36kPa
01:00 ☾
13°C 15°C 17°C - 73% 0.38kPa
02:00 ☾
14°C 15°C 18°C - 62% 0.4kPa
03:00 ☾
15°C 15°C 19°C - 50% 0.42kPa
04:00
16°C 16°C 20°C - 64% 0.51kPa
05:00
16°C 16°C 21°C - 77% 0.6kPa
06:00
17°C 16°C 22°C - 91% 0.71kPa
07:00
17°C 16°C 23°C - 94% 0.82kPa
08:00
18°C 17°C 24°C - 97% 0.95kPa
09:00
18°C 17°C 25°C - 100% 1.1kPa
10:00
18°C 17°C 25°C - 100% 1.1kPa
11:00
17°C 17°C 25°C - 100% 1.1kPa
12:00
17°C 18°C 25°C - 99% 1.2kPa
13:00
18°C 18°C 23°C - 66% 0.86kPa
14:00
18°C 18°C 22°C - 33% 0.6kPa
15:00
18°C 18°C 21°C - 0% 0.37kPa
16:00
18°C 18°C 20°C - 0% 0.32kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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