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Rule Morning Frost

Teijo - Morning Frost - Southern Finland

Matildedal, Southwest Finland, 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 86% failing

Currently

Real-time conditions
Soil Temperature12.7°C
Dew Point11.8°C (moderate dew point)
Wind Speed1.3m/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%4.7m/s
17:000%4.7m/s
18:000%4.1m/s
19:000%3.4m/s
20:000%2.7m/s
21:000%1.8m/s
22:000%1.6m/s
23:000%1.3m/s
Wed, Jul 8
24:000%1.3m/s
01:000%1.6m/s
02:000%1.8m/s
03:000%1.2m/s
04:000%1.5m/s
05:000%1.7m/s
06:000%1.8m/s
07:000%2.2m/s
08:000%2.2m/s
09:000%1.7m/s
10:000%2.4m/s
11:000%2.5m/s
12:000%2.3m/s
13:000%2.4m/s
14:000%2.5m/s
15:000%2.6m/s
16:000%2.1m/s
17:000%1.3m/s
18:000%1.2m/s
19:000%1.2m/s
20:000%0.83m/s
21:000%1m/s
22:000%2.1m/s
23:000%2.8m/s
Thu, Jul 9
24:000%3.4m/s
01:000%4m/s
02:000%4.4m/s
03:000%4.4m/s
04:000%4.4m/s
05:000%4.4m/s
06:000%4.7m/s
07:000%5m/s
08:000%4.7m/s
09:000%4.8m/s
10:000%4.9m/s
11:000%5m/s
12:000%5.2m/s
13:000%4.7m/s
14:000%5m/s
15:000%5m/s
16:000%4.8m/s
17:000%4.3m/s
18:000%3.8m/s
19:000%3.3m/s
20:000%2.9m/s
21:000%3m/s
22:000%2.7m/s
23:000%2.2m/s
Fri, Jul 10
24:000%2.3m/s
01:000%2.3m/s
02:000%2.2m/s
03:000%2.3m/s
04:000%2.3m/s
05:000%2.3m/s
06:000%2.1m/s
07:000%2.1m/s
08:000%2.4m/s
09:000%2.5m/s
10:000%2.8m/s
11:000%3m/s
12:000%2.8m/s
13:000%2.6m/s
14:000%2.4m/s
15:000%2.6m/s
16:000%1.7m/s
17:000%0.86m/s
18:000%0.84m/s
19:000%1.1m/s
20:000%0.55m/s
21:000%0.46m/s
22:000%1.7m/s
23:000%3m/s
Sat, Jul 11
24:000%4.3m/s
01:000%4.7m/s
02:000%5.1m/s
03:000%5.5m/s
04:000%4.8m/s
05:000%4m/s
06:000%3.3m/s
07:000%3.3m/s
08:000%3.3m/s
09:000%3.4m/s
10:000%3.3m/s
11:000%3.3m/s
12:000%3.2m/s
13:000%3.5m/s
14:000%3.8m/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 04:17 Sunset 22:47
17:00
12°C 13°C 14°C - 100% 0.25kPa
18:00
12°C 13°C 14°C - 100% 0.21kPa
19:00
12°C 13°C 13°C - 100% 0.16kPa
20:00
12°C 13°C 14°C - 100% 0.15kPa
21:00
12°C 13°C 14°C - 100% 0.16kPa
22:00
12°C 13°C 13°C - 100% 0.13kPa
23:00
11°C 13°C 12°C - 100% 0.09kPa
Thu, Jul 9 Sunrise 04:17 Sunset 22:47
24:00
11°C 13°C 12°C - 67% 0.08kPa
01:00
11°C 12°C 12°C - 100% 0.09kPa
02:00
10°C 12°C 11°C - 100% 0.08kPa
03:00
10°C 12°C 11°C - 100% 0.1kPa
04:00
9.7°C 12°C 11°C - 100% 0.11kPa
05:00
9.6°C 12°C 11°C - 100% 0.1kPa
06:00
9.9°C 12°C 11°C - 100% 0.13kPa
07:00
9.9°C 12°C 12°C - 100% 0.19kPa
08:00
9.8°C 12°C 13°C - 100% 0.26kPa
09:00
9.9°C 12°C 14°C - 100% 0.34kPa
10:00
11°C 12°C 13°C - 100% 0.14kPa
11:00
11°C 12°C 12°C - 100% 0.08kPa
12:00
11°C 12°C 12°C - 100% 0.07kPa
13:00
12°C 12°C 12°C - 100% 0.08kPa
14:00
12°C 12°C 12°C - 100% 0.08kPa
15:00
12°C 12°C 13°C - 100% 0.07kPa
16:00
12°C 12°C 13°C - 100% 0.06kPa
17:00
12°C 12°C 13°C - 100% 0.07kPa
18:00
12°C 12°C 13°C - 100% 0.07kPa
19:00
13°C 12°C 13°C - 97% 0.07kPa
20:00
14°C 12°C 14°C - 72% 0.08kPa
21:00
14°C 12°C 15°C - 97% 0.11kPa
22:00
13°C 12°C 14°C - 96% 0.13kPa
23:00
13°C 12°C 14°C - 17% 0.1kPa
Fri, Jul 10 Sunrise 04:19 Sunset 22:46
24:00
13°C 12°C 13°C - 21% 0.03kPa
01:00
12°C 12°C 13°C - 33% 0.02kPa
02:00
12°C 12°C 12°C - 34% 0.02kPa
03:00
12°C 12°C 12°C - 22% 0.02kPa
04:00
11°C 12°C 11°C - 2% 0.05kPa
05:00
10°C 12°C 11°C - 2% 0.06kPa
06:00
11°C 12°C 11°C - 5% 0.08kPa
07:00
12°C 12°C 13°C - 100% 0.13kPa
08:00
12°C 12°C 15°C - 100% 0.23kPa
09:00
13°C 12°C 16°C - 100% 0.41kPa
10:00
12°C 12°C 18°C - 75% 0.69kPa
11:00
11°C 13°C 20°C - 100% 0.99kPa
12:00
11°C 13°C 21°C - 64% 1.2kPa
13:00
10°C 13°C 22°C - 34% 1.4kPa
14:00
10°C 14°C 23°C - 96% 1.5kPa
15:00
11°C 14°C 22°C - 100% 1.4kPa
16:00
11°C 14°C 21°C - 100% 1.2kPa
17:00
11°C 15°C 21°C - 85% 1.2kPa
18:00
12°C 15°C 20°C - 5% 0.98kPa
19:00
11°C 15°C 21°C - 26% 1.1kPa
20:00
13°C 15°C 20°C - 70% 0.93kPa
21:00
13°C 15°C 18°C - 57% 0.57kPa
22:00
13°C 3252°C 18°C - 72% 0.48kPa
23:00
13°C 6489°C 17°C - 86% 0.4kPa
Sat, Jul 11 Sunrise 04:21 Sunset 22:45
24:00
13°C 9726°C 16°C - 100% 0.32kPa
01:00
13°C 9726°C 16°C - 100% 0.34kPa
02:00
13°C 9726°C 17°C - 100% 0.37kPa
03:00
13°C 9726°C 17°C - 100% 0.39kPa
04:00
13°C 9726°C 17°C - 100% 0.43kPa
05:00
13°C 9726°C 18°C - 99% 0.48kPa
06:00
14°C 9726°C 18°C - 99% 0.53kPa
07:00
14°C 9726°C 18°C - 99% 0.52kPa
08:00
15°C 9726°C 19°C - 100% 0.5kPa
09:00
15°C 9726°C 19°C - 100% 0.49kPa
10:00
15°C 9726°C 19°C - 100% 0.45kPa
11:00
15°C 9726°C 19°C - 100% 0.41kPa
12:00
15°C 9726°C 18°C - 100% 0.38kPa
13:00
16°C 9726°C 19°C - 100% 0.39kPa
14:00
16°C 9726°C 19°C - 100% 0.39kPa
15:00
16°C 9726°C 19°C - 100% 0.4kPa
16:00
16°C 9726°C 19°C - 98% 0.32kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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