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More Morning Frost in Southern Finland
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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 94% failing
Wind Speed 89% failing
Time Window 86% failing

Currently

Real-time conditions
Frost Probability
29%
Soil Temperature5.4°C
Dew Point2.5°C (low dew point)
Wind Speed5.1m/s (moderate winds)
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 80 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
Sun, Mar 15
06:00✓18%4.4m/s
07:00✓18%4.5m/s
08:00✓18%4.6m/s
09:00✕26%4.7m/s
10:00✕26%5m/s
11:00✕31%4.9m/s
12:00✕33%5.1m/s
13:00✕30%5.2m/s
14:00✕29%5.3m/s
15:00✕29%5.1m/s
16:00✕29%5m/s
17:00✕29%4.9m/s
18:00✕29%4.8m/s
19:00✕29%5.1m/s
20:00✕29%5.5m/s
21:00✕14%6.1m/s
22:00✕13%5.4m/s
23:00✕13%4.7m/s
Mon, Mar 16
24:00✕11%4.2m/s
01:00✕13%3.1m/s
02:00✕15%2.5m/s
03:00✕15%2.5m/s
04:00✕24%1.7m/s
05:00✓22%1.8m/s
06:00✓22%2.1m/s
07:00✓24%2.9m/s
08:00✓26%1.9m/s
09:00✕41%2.2m/s
10:00✕44%2.6m/s
11:00✕35%2.8m/s
12:00✕37%2.7m/s
13:00✕37%2.6m/s
14:00✕37%2.6m/s
15:00✕37%2.7m/s
16:00✕37%2.6m/s
17:00✕37%2.5m/s
18:00✕26%2.1m/s
19:00✕22%2.1m/s
20:00✕22%1.9m/s
21:00✕24%1.6m/s
22:00✕39%1.4m/s
23:00✕39%1.2m/s
Tue, Mar 17
24:00✕39%1.2m/s
01:00✕39%1.2m/s
02:00✕39%1.1m/s
03:00✕39%1.3m/s
04:00✕39%1.2m/s
05:00✓39%1.4m/s
06:00✓39%1.6m/s
07:00✓39%1.6m/s
08:00✕39%1.7m/s
09:00✕37%1.9m/s
10:00✕41%2.2m/s
11:00✕44%2.5m/s
12:00✕50%2.9m/s
13:00✕50%2.9m/s
14:00✕40%3.7m/s
15:00✕27%3.4m/s
16:00✕28%3.2m/s
17:00✕34%3m/s
18:00✕37%2.5m/s
19:00✕48%2.2m/s
20:00✕50%2.9m/s
21:00✕46%3.1m/s
22:00✕40%3.3m/s
23:00✕49%3.4m/s
Wed, Mar 18
24:00✕49%3.7m/s
01:00✕49%3.9m/s
02:00✕49%4.1m/s
03:00✕58%4.4m/s
04:00✕58%4.7m/s
05:00✓63%5m/s
06:00✓63%5.2m/s
07:00✓63%5.4m/s
08:00✕63%5.6m/s
09:00✕58%5.5m/s
10:00✕40%5.5m/s
11:00✕37%5.4m/s
12:00✕37%5.2m/s
13:00✕37%5.1m/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
Sun, Mar 15 Sunrise 06:35 Sunset 18:18
15:00
2.5°C 5.4°C 7.5°C - 100% 0.3kPa
16:00
2.3°C 5.3°C 7.1°C - 100% 0.28kPa
17:00
2.2°C 5.3°C 6.5°C - 100% 0.25kPa
18:00
2.1°C 5°C 6°C - 100% 0.22kPa
19:00 ☾
1.7°C 4.7°C 5.6°C - 100% 0.21kPa
20:00 ☾
1.7°C 4.4°C 5.6°C - 100% 0.22kPa
21:00 ☾
2.7°C 4.3°C 5.7°C - 100% 0.17kPa
22:00 ☾
3.5°C 4.2°C 4.8°C - 100% 0.08kPa
23:00 ☾
3.4°C 4°C 4.4°C - 100% 0.06kPa
Mon, Mar 16 Sunrise 06:35 Sunset 18:18
24:00 ☾
3.1°C 3.8°C 3.6°C - 100% 0.03kPa
01:00 ☾
2.2°C 3.6°C 2.7°C - 100% 0.03kPa
02:00 ☾
1.9°C 3.3°C 2.4°C - 100% 0.02kPa
03:00 ☾
1.7°C 3°C 2.1°C - 100% 0.02kPa
04:00 ☾
1.5°C 2.8°C 1.9°C - 100% 0.02kPa
05:00 ☾
1.4°C 2.6°C 1.9°C - 100% 0.02kPa
06:00 ☾
1.3°C 2.4°C 1.9°C - 100% 0.03kPa
07:00
0°C 2.2°C 2°C - 100% 0.09kPa
08:00
0.2°C 2°C 2°C - 100% 0.08kPa
09:00
0.1°C 2°C 2.3°C - 100% 0.1kPa
10:00
-0.2°C 2°C 2.7°C - 100% 0.14kPa
11:00
-0.3°C 2.2°C 3°C - 100% 0.16kPa
12:00
-0.2°C 2.3°C 3.4°C - 99% 0.18kPa
13:00
-0.2°C 2.6°C 3.6°C - 99% 0.19kPa
14:00
-0.2°C 2.7°C 3.6°C - 100% 0.19kPa
15:00
-0.3°C 3°C 3.4°C - 100% 0.18kPa
16:00
-0.3°C 2.9°C 3.3°C - 100% 0.17kPa
17:00
-0.3°C 2.7°C 3°C - 100% 0.16kPa
18:00
0.4°C 2.6°C 2.6°C - 100% 0.1kPa
19:00 ☾
1.1°C 2.4°C 2°C - 99% 0.04kPa
20:00 ☾
1.3°C 2.2°C 1.6°C - 100% 0.02kPa
21:00 ☾
1.6°C 2.1°C 1.7°C - 100% 0kPa
22:00 ☾
1.3°C 1.9°C 1.3°C - 100% 0kPa
23:00 ☾
1.2°C 1.8°C 1.2°C - 100% 0kPa
Tue, Mar 17 Sunrise 06:32 Sunset 18:21
24:00 ☾
1.1°C 1.6°C 1.2°C - 100% 0kPa
01:00 ☾
1.1°C 1.5°C 1.2°C - 100% 0.01kPa
02:00 ☾
1°C 1.4°C 1.2°C - 100% 0.01kPa
03:00 ☾
0.8°C 1.3°C 1.1°C - 100% 0.01kPa
04:00 ☾
0.8°C 1.2°C 1°C - 100% 0.01kPa
05:00 ☾
0.9°C 1.2°C 1.1°C - 100% 0.01kPa
06:00 ☾
0.8°C 1.1°C 1.1°C - 100% 0.01kPa
07:00
0.9°C 1.1°C 1.1°C - 100% 0.01kPa
08:00
1°C 1°C 1.3°C - 100% 0.01kPa
09:00
1°C 1.1°C 1.4°C - 100% 0.02kPa
10:00
0.6°C 1.2°C 1.8°C - 100% 0.06kPa
11:00
0.2°C 1.4°C 2.6°C - 100% 0.12kPa
12:00
-0.7°C 1.7°C 3.4°C - 100% 0.2kPa
13:00
-0.2°C 1.9°C 3.3°C - 100% 0.18kPa
14:00
-0.1°C 2.2°C 4°C - 100% 0.21kPa
15:00
0.8°C 2.4°C 3.7°C - 100% 0.15kPa
16:00
1.1°C 2.4°C 3.1°C - 44% 0.1kPa
17:00
0.9°C 2.5°C 3.1°C - 39% 0.11kPa
18:00
-0.1°C 2.2°C 2.1°C - 17% 0.1kPa
19:00 ☾
-0.4°C 1.9°C 0.75°C - 27% 0.05kPa
20:00 ☾
-0.5°C 1.4°C 0.48°C - 5% 0.04kPa
21:00 ☾
-1°C 1.3°C 0.16°C - 36% 0.05kPa
22:00 ☾
-1.5°C 1.1°C -0.15°C - 67% 0.05kPa
23:00 ☾
-1.9°C 1°C -0.47°C - 99% 0.06kPa
Wed, Mar 18 Sunrise 06:29 Sunset 18:23
24:00 ☾
-1.8°C 0.81°C -0.01°C - 99% 0.07kPa
01:00 ☾
-1.6°C 0.62°C 0.45°C - 100% 0.09kPa
02:00 ☾
-1.5°C 0.44°C 0.9°C - 100% 0.1kPa
03:00 ☾
-1.1°C 0.44°C 1.9°C - 100% 0.14kPa
04:00 ☾
-0.8°C 0.45°C 3°C - 100% 0.18kPa
05:00 ☾
-0.5°C 0.45°C 4°C - 100% 0.22kPa
06:00 ☾
0.2°C 0.45°C 4.6°C - 100% 0.23kPa
07:00
0.9°C 0.45°C 5.1°C - 100% 0.23kPa
08:00
1.6°C 0.46°C 5.7°C - 100% 0.23kPa
09:00
1.8°C 0.89°C 5.1°C - 100% 0.18kPa
10:00
2.1°C 1.3°C 4.5°C - 100% 0.13kPa
11:00
2.2°C 1.7°C 3.9°C - 100% 0.09kPa
12:00
2.3°C 1.9°C 3.8°C - 100% 0.08kPa
13:00
2.3°C 2°C 3.7°C - 100% 0.07kPa
14:00
2.4°C 2.1°C 3.6°C - 100% 0.06kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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