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More Morning Frost in Southern Finland
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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)
Wind Speed 100% failing
Frost Probability 94% failing
Time Window 86% failing

Currently

Real-time conditions
Frost Probability
48%
Soil Temperature-0.1°C
Dew Point2.8°C (low dew point)
Wind Speed4.2m/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 74 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
Thu, Mar 12
06:00✓48%3.9m/s
07:00✓48%4.1m/s
08:00✓46%4.3m/s
09:00✕48%4.2m/s
10:00✕46%4.6m/s
11:00✕46%4.5m/s
12:00✕46%4.4m/s
13:00✕48%3.8m/s
14:00✕48%3.6m/s
15:00✕45%3.5m/s
16:00✕47%4.3m/s
17:00✕48%4.2m/s
18:00✕60%3.4m/s
19:00✕50%3.8m/s
20:00✕49%3.8m/s
21:00✕49%4m/s
22:00✕47%4.4m/s
23:00✕47%4.7m/s
Fri, Mar 13
24:00✕47%4.9m/s
01:00✕47%5.3m/s
02:00✕47%5.4m/s
03:00✕45%5.9m/s
04:00✕45%6.3m/s
05:00✕45%6.4m/s
06:00✓45%6.7m/s
07:00✓45%6.9m/s
08:00✓48%7m/s
09:00✕56%7.1m/s
10:00✕56%7.4m/s
11:00✕61%7.4m/s
12:00✕61%7.6m/s
13:00✕61%7.8m/s
14:00✕51%7.8m/s
15:00✕51%8m/s
16:00✕51%8.1m/s
17:00✕51%8.4m/s
18:00✕51%8.5m/s
19:00✕51%8.2m/s
20:00✕52%8.1m/s
21:00✕46%7.5m/s
22:00✕38%7.1m/s
23:00✕38%6.6m/s
Sat, Mar 14
24:00✕35%5.8m/s
01:00✕37%5.1m/s
02:00✕33%4.3m/s
03:00✕35%3.8m/s
04:00✕35%3.4m/s
05:00✕35%3.5m/s
06:00✓35%3.7m/s
07:00✓33%4.3m/s
08:00✓33%4.7m/s
09:00✕33%4.7m/s
10:00✕33%4.6m/s
11:00✕33%4.5m/s
12:00✕18%4.3m/s
13:00✕18%4.3m/s
14:00✕22%4.2m/s
15:00✕27%4.2m/s
16:00✕24%3.9m/s
17:00✕24%3.8m/s
18:00✕17%4.2m/s
19:00✕15%4.4m/s
20:00✕15%4.6m/s
21:00✕18%4.6m/s
22:00✕18%4.6m/s
23:00✕18%4.6m/s
Sun, Mar 15
24:00✕18%4.5m/s
01:00✕18%4.5m/s
02:00✕15%4.4m/s
03:00✕15%4.3m/s
04:00✕18%4.2m/s
05:00✓20%4.2m/s
06:00✓20%4m/s
07:00✓27%3.9m/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
Thu, Mar 12 Sunrise 06:51 Sunset 18:18
09:00
2.8°C -0.08°C 3.1°C - 100% 0.02kPa
10:00
3.3°C -0.06°C 3.6°C - 100% 0.02kPa
11:00
3.3°C -0.04°C 3.5°C - 100% 0.02kPa
12:00
2.8°C -0.04°C 3.2°C - 100% 0.02kPa
13:00
2.4°C -0.02°C 2.7°C - 100% 0.01kPa
14:00
2.3°C -0.05°C 2.6°C - 100% 0.01kPa
15:00
3°C 0.15°C 3.4°C - 100% 0.02kPa
16:00
2.2°C 0.25°C 3.5°C - 100% 0.07kPa
17:00
1.5°C 0.27°C 3.5°C - 64% 0.1kPa
18:00
1.2°C 0.28°C 2.6°C - 10% 0.07kPa
19:00 ☾
0.3°C 0.24°C 1.7°C - 77% 0.06kPa
20:00 ☾
0°C 0.2°C 1.5°C - 100% 0.07kPa
21:00 ☾
-0.3°C 0.17°C 1.2°C - 100% 0.07kPa
22:00 ☾
-0.4°C 0.16°C 1.5°C - 100% 0.09kPa
23:00 ☾
-0.1°C 0.13°C 1.7°C - 100% 0.08kPa
Fri, Mar 13 Sunrise 06:51 Sunset 18:18
24:00 ☾
-0.2°C 0.11°C 1.7°C - 100% 0.09kPa
01:00 ☾
-0.1°C 0.08°C 1.8°C - 100% 0.09kPa
02:00 ☾
0°C 0.08°C 1.7°C - 100% 0.08kPa
03:00 ☾
-0.1°C 0.07°C 1.7°C - 100% 0.08kPa
04:00 ☾
-0.2°C 0.06°C 1.5°C - 100% 0.08kPa
05:00 ☾
0.3°C 0.06°C 2°C - 98% 0.08kPa
06:00 ☾
0.7°C 0.09°C 2.5°C - 100% 0.09kPa
07:00
0.5°C 0.11°C 2.5°C - 100% 0.1kPa
08:00
0.7°C 0.14°C 3.2°C - 100% 0.13kPa
09:00
1°C 0.21°C 4°C - 100% 0.16kPa
10:00
1.4°C 0.34°C 4.9°C - 100% 0.19kPa
11:00
1.7°C 0.52°C 5.5°C - 100% 0.21kPa
12:00
2°C 0.72°C 6.1°C - 100% 0.24kPa
13:00
2.2°C 0.97°C 6.7°C - 100% 0.27kPa
14:00
2.2°C 1.1°C 6.9°C - 100% 0.28kPa
15:00
2.1°C 1.2°C 6.6°C - 96% 0.27kPa
16:00
1.7°C 1.4°C 6.1°C - 100% 0.25kPa
17:00
1.4°C 1.4°C 5.9°C - 100% 0.25kPa
18:00
0.8°C 1.4°C 5.6°C - 98% 0.26kPa
19:00 ☾
0.8°C 1.4°C 5.2°C - 97% 0.24kPa
20:00 ☾
1.2°C 1.3°C 5.1°C - 74% 0.21kPa
21:00 ☾
1.5°C 1.2°C 4.9°C - 92% 0.18kPa
22:00 ☾
1.8°C 1.2°C 4.7°C - 100% 0.16kPa
23:00 ☾
2°C 1.2°C 4.4°C - 100% 0.13kPa
Sat, Mar 14 Sunrise 06:48 Sunset 18:20
24:00 ☾
2.4°C 1.2°C 4°C - 100% 0.09kPa
01:00 ☾
2.5°C 1.2°C 3.7°C - 100% 0.07kPa
02:00 ☾
2.5°C 1.1°C 3.4°C - 100% 0.05kPa
03:00 ☾
2.5°C 1.1°C 3.2°C - 100% 0.04kPa
04:00 ☾
2.6°C 1.1°C 3.2°C - 100% 0.03kPa
05:00 ☾
2.7°C 1.1°C 3.4°C - 100% 0.04kPa
06:00 ☾
3°C 1.2°C 3.6°C - 100% 0.04kPa
07:00
3°C 1.3°C 3.7°C - 100% 0.04kPa
08:00
3.1°C 1.5°C 3.9°C - 100% 0.04kPa
09:00
3.2°C 1.6°C 3.9°C - 100% 0.04kPa
10:00
3.4°C 1.8°C 4.2°C - 100% 0.04kPa
11:00
3.6°C 1.9°C 4.4°C - 100% 0.05kPa
12:00
3.7°C 2.1°C 4.5°C - 100% 0.05kPa
13:00
3.7°C 2.2°C 4.6°C - 100% 0.05kPa
14:00
3.8°C 2.4°C 5.1°C - 100% 0.07kPa
15:00
4.2°C 2.6°C 6°C - 100% 0.11kPa
16:00
4.4°C 2.9°C 6°C - 100% 0.09kPa
17:00
4.1°C 3°C 5.4°C - 100% 0.07kPa
18:00
4°C 3.1°C 5.4°C - 100% 0.08kPa
19:00 ☾
3.9°C 3.1°C 5.2°C - 100% 0.08kPa
20:00 ☾
3.9°C 3.1°C 5.5°C - 100% 0.09kPa
21:00 ☾
3.8°C 3.2°C 5.6°C - 100% 0.11kPa
22:00 ☾
3.8°C 3.3°C 5.7°C - 100% 0.12kPa
23:00 ☾
3.7°C 3.4°C 5.8°C - 100% 0.13kPa
Sun, Mar 15 Sunrise 06:45 Sunset 18:23
24:00 ☾
3.6°C 3.4°C 5.5°C - 100% 0.12kPa
01:00 ☾
3.5°C 3.4°C 5.3°C - 100% 0.11kPa
02:00 ☾
3.3°C 3.4°C 5°C - 100% 0.1kPa
03:00 ☾
3.1°C 3.3°C 4.9°C - 100% 0.1kPa
04:00 ☾
2.8°C 3.2°C 4.7°C - 100% 0.11kPa
05:00 ☾
2.5°C 3.1°C 4.6°C - 100% 0.12kPa
06:00 ☾
2.3°C 3°C 4.4°C - 100% 0.11kPa
07:00
2.1°C 2.9°C 4.2°C - 100% 0.11kPa
08:00
1.9°C 2.8°C 4°C - 100% 0.11kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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