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Rule Morning Frost

Aulanko - Morning Frost - Southern Finland

Hämeenlinna, 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
Time Window 88% failing
Wind Speed 78% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature11.6°C
Dew Point11.3°C (moderate dew point)
Wind Speed2.5m/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%2.2m/s
17:00✕0%1.7m/s
18:00✕0%1.6m/s
19:00✕0%1.5m/s
20:00✕0%1.4m/s
21:00✕0%1.9m/s
22:00✕0%1.3m/s
23:00✕0%1.3m/s
Wed, Jul 8
24:00✕0%1.2m/s
01:00✕0%1m/s
02:00✕0%0.8m/s
03:00✓0%0.66m/s
04:00✓0%0.17m/s
05:00✓0%0.52m/s
06:00✕0%0.4m/s
07:00✕0%0.57m/s
08:00✕0%0.21m/s
09:00✕0%1.3m/s
10:00✕0%0.96m/s
11:00✕0%1.6m/s
12:00✕0%1.4m/s
13:00✕0%1.9m/s
14:00✕0%2.2m/s
15:00✕0%2.3m/s
16:00✕0%2.4m/s
17:00✕0%2.5m/s
18:00✕0%2.1m/s
19:00✕0%2m/s
20:00✕0%1.8m/s
21:00✕0%1.5m/s
22:00✕0%2.2m/s
23:00✕0%2.6m/s
Thu, Jul 9
24:00✕0%2.8m/s
01:00✕0%3.4m/s
02:00✕0%3.4m/s
03:00✓0%3.7m/s
04:00✓0%3.7m/s
05:00✓0%3.9m/s
06:00✕0%4.1m/s
07:00✕0%4.2m/s
08:00✕0%4m/s
09:00✕0%4.5m/s
10:00✕0%4.2m/s
11:00✕0%4m/s
12:00✕0%4.5m/s
13:00✕0%4.6m/s
14:00✕0%4.4m/s
15:00✕0%3.8m/s
16:00✕0%3.4m/s
17:00✕0%3.2m/s
18:00✕0%3.2m/s
19:00✕0%3.5m/s
20:00✕0%3.5m/s
21:00✕0%3m/s
22:00✕0%2.7m/s
23:00✕0%2.2m/s
Fri, Jul 10
24:00✕0%2.1m/s
01:00✕0%1.9m/s
02:00✕0%1.5m/s
03:00✓0%1.4m/s
04:00✓0%1.3m/s
05:00✓0%1.3m/s
06:00✕0%1.2m/s
07:00✕0%1.1m/s
08:00✕0%1.5m/s
09:00✕0%1.7m/s
10:00✕0%1.8m/s
11:00✕0%2.3m/s
12:00✕0%2.1m/s
13:00✕0%2.1m/s
14:00✕0%2.5m/s
15:00✕0%2.7m/s
16:00✕0%3m/s
17:00✕0%3.4m/s
18:00✕0%3m/s
19:00✕0%3.1m/s
20:00✕0%2.1m/s
21:00✕0%1.2m/s
22:00✕0%1.2m/s
23:00✕0%1.2m/s
Sat, Jul 11
24:00✕0%1.1m/s
01:00✕0%1.3m/s
02:00✕0%1.5m/s
03:00✓0%1.7m/s
04:00✓0%1.6m/s
05:00✓0%1.6m/s
06:00✕0%1.5m/s
07:00✕0%1.4m/s
08:00✕0%1.3m/s
09:00✕0%1.2m/s
10:00✕0%1.5m/s
11:00✕0%1.7m/s
12:00✕0%1.9m/s
13:00✕0%2m/s
14:00✕0%2.1m/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
Wed, Jul 8 Sunrise 04:03 Sunset 22:50
17:00
11°C 12°C 17°C - 100% 0.6kPa
18:00
13°C 12°C 16°C - 100% 0.26kPa
19:00
13°C 12°C 15°C - 100% 0.26kPa
20:00
12°C 12°C 15°C - 100% 0.25kPa
21:00
12°C 12°C 14°C - 100% 0.21kPa
22:00
11°C 12°C 12°C - 94% 0.14kPa
23:00 ☾
10°C 12°C 11°C - 68% 0.08kPa
Thu, Jul 9 Sunrise 04:03 Sunset 22:50
24:00 ☾
9.7°C 12°C 11°C - 91% 0.07kPa
01:00 ☾
9.6°C 12°C 11°C - 91% 0.08kPa
02:00 ☾
9.3°C 12°C 10°C - 100% 0.08kPa
03:00 ☾
8.8°C 11°C 10°C - 100% 0.09kPa
04:00 ☾
8.7°C 11°C 9.8°C - 100% 0.09kPa
05:00
8.8°C 11°C 10°C - 100% 0.1kPa
06:00
9.1°C 11°C 11°C - 100% 0.13kPa
07:00
9°C 11°C 11°C - 100% 0.19kPa
08:00
9.3°C 11°C 12°C - 100% 0.24kPa
09:00
10°C 11°C 11°C - 100% 0.1kPa
10:00
10°C 11°C 11°C - 100% 0.09kPa
11:00
11°C 11°C 12°C - 100% 0.09kPa
12:00
11°C 11°C 12°C - 100% 0.07kPa
13:00
12°C 11°C 12°C - 100% 0.05kPa
14:00
11°C 11°C 12°C - 100% 0.05kPa
15:00
11°C 11°C 12°C - 100% 0.05kPa
16:00
12°C 11°C 12°C - 100% 0.04kPa
17:00
13°C 11°C 14°C - 100% 0.05kPa
18:00
14°C 11°C 15°C - 75% 0.06kPa
19:00
15°C 11°C 16°C - 71% 0.1kPa
20:00
15°C 11°C 16°C - 52% 0.08kPa
21:00
15°C 12°C 15°C - 49% 0.06kPa
22:00
14°C 12°C 14°C - 43% 0.02kPa
23:00 ☾
13°C 12°C 14°C - 34% 0.01kPa
Fri, Jul 10 Sunrise 04:04 Sunset 22:48
24:00 ☾
13°C 12°C 13°C - 35% 0.01kPa
01:00 ☾
12°C 12°C 12°C - 28% 0.02kPa
02:00 ☾
12°C 12°C 12°C - 25% 0.02kPa
03:00 ☾
12°C 12°C 12°C - 21% 0.02kPa
04:00 ☾
11°C 12°C 11°C - 8% 0.03kPa
05:00
11°C 12°C 11°C - 100% 0.04kPa
06:00
11°C 11°C 12°C - 100% 0.07kPa
07:00
12°C 11°C 13°C - 100% 0.11kPa
08:00
12°C 12°C 14°C - 100% 0.2kPa
09:00
12°C 12°C 15°C - 100% 0.32kPa
10:00
12°C 12°C 17°C - 100% 0.51kPa
11:00
11°C 12°C 19°C - 65% 0.96kPa
12:00
9.9°C 12°C 21°C - 1% 1.2kPa
13:00
9.6°C 13°C 22°C - 85% 1.4kPa
14:00
9.5°C 13°C 23°C - 100% 1.5kPa
15:00
9.3°C 13°C 23°C - 100% 1.6kPa
16:00
9.4°C 14°C 23°C - 60% 1.6kPa
17:00
9.4°C 14°C 23°C - 44% 1.6kPa
18:00
9.8°C 14°C 22°C - 15% 1.5kPa
19:00
11°C 15°C 22°C - 5% 1.3kPa
20:00
12°C 15°C 21°C - 100% 1.1kPa
21:00
12°C 15°C 18°C - 100% 0.64kPa
22:00
13°C 15°C 17°C - 100% 0.43kPa
23:00 ☾
13°C 14°C 15°C - 100% 0.25kPa
Sat, Jul 11 Sunrise 04:06 Sunset 22:47
24:00 ☾
13°C 14°C 14°C - 100% 0.1kPa
01:00 ☾
13°C 14°C 14°C - 100% 0.1kPa
02:00 ☾
13°C 14°C 14°C - 100% 0.11kPa
03:00 ☾
14°C 14°C 15°C - 100% 0.12kPa
04:00 ☾
14°C 14°C 16°C - 88% 0.21kPa
05:00
14°C 14°C 17°C - 77% 0.31kPa
06:00
15°C 14°C 18°C - 65% 0.42kPa
07:00
15°C 14°C 19°C - 60% 0.54kPa
08:00
15°C 14°C 20°C - 54% 0.66kPa
09:00
16°C 14°C 22°C - 49% 0.8kPa
10:00
17°C 15°C 22°C - 66% 0.71kPa
11:00
18°C 15°C 22°C - 83% 0.61kPa
12:00
19°C 15°C 22°C - 100% 0.51kPa
13:00
18°C 15°C 21°C - 100% 0.41kPa
14:00
18°C 16°C 21°C - 100% 0.32kPa
15:00
18°C 16°C 20°C - 100% 0.23kPa
16:00
18°C 16°C 19°C - 83% 0.18kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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