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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)
Wind Speed 100% failing
Time Window 88% failing
Frost Probability 74% failing

Currently

Real-time conditions
Frost Probability
50%
Soil Temperature2.6°C
Dew Point-8.2°C (low dew point)
Wind Speed3.1m/s (calm conditions)
Cloud Cover0%

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
Wed, Apr 8
04:00✕46%5.6m/s
05:00✓48%5.6m/s
06:00✓48%5.3m/s
07:00✓49%5.2m/s
08:00✕55%5.4m/s
09:00✕63%5.3m/s
10:00✕70%5.7m/s
11:00✕70%6m/s
12:00✕70%5.9m/s
13:00✕66%5.9m/s
14:00✕51%5.8m/s
15:00✕44%5.8m/s
16:00✕44%5.7m/s
17:00✕46%5m/s
18:00✕44%4.7m/s
19:00✕46%4.5m/s
20:00✕48%4.2m/s
21:00✕59%3.8m/s
22:00✕59%3.8m/s
23:00✕59%3.8m/s
Thu, Apr 9
24:00✕59%3.6m/s
01:00✕59%3.4m/s
02:00✕54%3.3m/s
03:00✕50%3.2m/s
04:00✕50%3.2m/s
05:00✓50%3.1m/s
06:00✓50%2.9m/s
07:00✓65%3m/s
08:00✕74%3.6m/s
09:00✕74%3.8m/s
10:00✕68%3.6m/s
11:00✕70%3.5m/s
12:00✕62%3.7m/s
13:00✕52%3.8m/s
14:00✕52%3.8m/s
15:00✕55%3.7m/s
16:00✕55%3.6m/s
17:00✕49%3.4m/s
18:00✕40%2.8m/s
19:00✕42%2.2m/s
20:00✕46%2.2m/s
21:00✕46%2.1m/s
22:00✕46%1.9m/s
23:00✕46%1.7m/s
Fri, Apr 10
24:00✕48%1.6m/s
01:00✕48%1.5m/s
02:00✕48%1.5m/s
03:00✕48%1.6m/s
04:00✕63%1.6m/s
05:00✓64%1.6m/s
06:00✓63%1.6m/s
07:00✓78%1.6m/s
08:00✕76%1.8m/s
09:00✕72%2.2m/s
10:00✕72%2.4m/s
11:00✕65%2.3m/s
12:00✕65%2.3m/s
13:00✕61%2.3m/s
14:00✕49%2.2m/s
15:00✕33%2.1m/s
16:00✕26%2.4m/s
17:00✕28%2.7m/s
18:00✕26%2.7m/s
19:00✕33%2.5m/s
20:00✕33%2.2m/s
21:00✕39%2.1m/s
22:00✕39%1.9m/s
23:00✕46%1.8m/s
Sat, Apr 11
24:00✕47%1.8m/s
01:00✕47%1.9m/s
02:00✕46%1.9m/s
03:00✕44%2.1m/s
04:00✕41%2.1m/s
05:00✓38%2.1m/s
06:00✓41%2.1m/s
07:00✓76%2.3m/s
08:00✕76%2.8m/s
09:00✕72%3.4m/s
10:00✕50%3.3m/s
11:00✕48%3.3m/s
12:00✕4.7%3.3m/s
13:00✕4.9%2.7m/s
14:00✕48%2.2m/s
15:00✕41%1.6m/s
16:00✕37%1.6m/s
17:00✕37%1.7m/s
18:00✕34%1.7m/s
19:00✕28%1.6m/s
20:00✕22%1.6m/s
21:00✕21%1.6m/s
22:00✕28%1.6m/s
23:00✕28%1.6m/s
Sun, Apr 12
24:00✕28%1.7m/s
01:00✕29%2.1m/s
02:00✕29%2.5m/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, Apr 9 Sunrise 06:16 Sunset 20:22
05:00 ☾
-8.2°C 2.6°C -2.7°C - 0% 0.17kPa
06:00 ☾
-8.2°C 2.3°C -3°C - 1% 0.16kPa
07:00
-8.3°C 1.7°C -3.1°C - 5% 0.16kPa
08:00
-8.7°C 1.2°C -2.1°C - 5% 0.21kPa
09:00
-9.7°C 1.1°C -0.5°C - 5% 0.3kPa
10:00
-11°C 1.1°C 1.1°C - 25% 0.39kPa
11:00
-11°C 1.1°C 2.9°C - 5% 0.5kPa
12:00
-12°C 1.1°C 4.3°C - 19% 0.6kPa
13:00
-13°C 1.1°C 5.4°C - 54% 0.66kPa
14:00
-12°C 1.1°C 5.9°C - 52% 0.69kPa
15:00
-12°C 1.1°C 6.1°C - 27% 0.69kPa
16:00
-11°C 1.2°C 5.9°C - 25% 0.67kPa
17:00
-11°C 2°C 5.6°C - 63% 0.65kPa
18:00
-9.6°C 2.5°C 5.2°C - 100% 0.59kPa
19:00
-8.3°C 2.6°C 3.5°C - 100% 0.46kPa
20:00
-7.9°C 2.3°C 1.4°C - 100% 0.34kPa
21:00 ☾
-7.9°C 2.2°C 0.13°C - 100% 0.28kPa
22:00 ☾
-7.8°C 2.1°C -0.23°C - 100% 0.26kPa
23:00 ☾
-7.8°C 2.1°C -0.52°C - 100% 0.25kPa
Fri, Apr 10 Sunrise 06:16 Sunset 20:22
24:00 ☾
-8.1°C 2.1°C -0.73°C - 100% 0.25kPa
01:00 ☾
-8.7°C 2.1°C -1°C - 100% 0.25kPa
02:00 ☾
-9.1°C 2.1°C -0.92°C - 100% 0.26kPa
03:00 ☾
-9.2°C 2.1°C -1.1°C - 100% 0.26kPa
04:00 ☾
-9.1°C 2°C -1.1°C - 100% 0.25kPa
05:00 ☾
-9.1°C 1.8°C -1.3°C - 75% 0.25kPa
06:00 ☾
-9.1°C 1.8°C -1.8°C - 96% 0.23kPa
07:00
-9.1°C 1.5°C -1.7°C - 5% 0.23kPa
08:00
-9.5°C 1.3°C -0.03°C - 4% 0.31kPa
09:00
-10°C 1.3°C 1.8°C - 5% 0.42kPa
10:00
-11°C 1.3°C 3.4°C - 6% 0.53kPa
11:00
-12°C 1.3°C 4.9°C - 5% 0.63kPa
12:00
-12°C 1.3°C 6.2°C - 5% 0.71kPa
13:00
-12°C 1.3°C 7.2°C - 18% 0.77kPa
14:00
-12°C 1.5°C 7.8°C - 61% 0.81kPa
15:00
-12°C 2.7°C 8.2°C - 100% 0.83kPa
16:00
-11°C 3.5°C 8.1°C - 100% 0.82kPa
17:00
-11°C 4°C 7.7°C - 100% 0.78kPa
18:00
-8.6°C 4.4°C 6.8°C - 100% 0.67kPa
19:00
-7.7°C 4.4°C 5.3°C - 100% 0.55kPa
20:00
-6.7°C 4.1°C 3.5°C - 100% 0.41kPa
21:00 ☾
-6.6°C 3.7°C 2.2°C - 100% 0.34kPa
22:00 ☾
-6.6°C 3.2°C 1.4°C - 100% 0.3kPa
23:00 ☾
-6.7°C 2.8°C 0.85°C - 97% 0.28kPa
Sat, Apr 11 Sunrise 06:13 Sunset 20:25
24:00 ☾
-6.8°C 2.4°C 0.18°C - 71% 0.25kPa
01:00 ☾
-6.7°C 2.4°C -0.41°C - 68% 0.22kPa
02:00 ☾
-6.6°C 2.4°C -0.61°C - 48% 0.21kPa
03:00 ☾
-6.6°C 2.4°C -0.91°C - 38% 0.2kPa
04:00 ☾
-6.7°C 2.4°C -1.2°C - 54% 0.19kPa
05:00 ☾
-6.7°C 2.4°C -1.3°C - 75% 0.18kPa
06:00 ☾
-6.9°C 2.3°C -1.3°C - 51% 0.19kPa
07:00
-7.1°C 1.9°C -0.94°C - 5% 0.21kPa
08:00
-7°C 1.7°C 1.1°C - 5% 0.3kPa
09:00
-7.1°C 1.7°C 3°C - 9% 0.4kPa
10:00
-4.7°C 3.3°C 5.2°C - 8% 0.45kPa
11:00
-2.3°C 4.8°C 7.4°C - 7% 0.51kPa
12:00
0.1°C 6.3°C 9.6°C - 6% 0.58kPa
13:00
0.6°C 6.1°C 7.9°C - 7% 0.42kPa
14:00
0.9°C 5.9°C 6.2°C - 9% 0.29kPa
15:00
0.9°C 5.8°C 4.5°C - 10% 0.19kPa
16:00
1°C 5.3°C 3.9°C - 9% 0.15kPa
17:00
1°C 4.8°C 3.3°C - 7% 0.12kPa
18:00
1°C 4.3°C 2.7°C - 5% 0.09kPa
19:00
0.9°C 3.9°C 2.5°C - 37% 0.08kPa
20:00
0.9°C 3.5°C 2.2°C - 68% 0.07kPa
21:00 ☾
0.8°C 3.1°C 2°C - 100% 0.06kPa
22:00 ☾
0.9°C 3°C 2.3°C - 100% 0.07kPa
23:00 ☾
1.1°C 2.9°C 2.7°C - 100% 0.08kPa
Sun, Apr 12 Sunrise 06:10 Sunset 20:27
24:00 ☾
1.2°C 2.8°C 3°C - 100% 0.09kPa
01:00 ☾
1.4°C 2.9°C 3.7°C - 97% 0.12kPa
02:00 ☾
1.5°C 3°C 4.5°C - 93% 0.16kPa
03:00 ☾
1.5°C 3.1°C 5.2°C - 90% 0.2kPa
04:00 ☾
1.3°C 3.5°C 5.4°C - 93% 0.23kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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