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More Morning Frost in Southern Finland
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Rule Morning Frost

Repovesi - Morning Frost - Southern Finland

Repovesi Nationalpark, Kymenlaakso, 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 99% failing
Time Window 88% failing
Frost Probability 61% failing

Currently

Real-time conditions
Frost Probability
50%
Soil Temperature2.5°C
Dew Point-8.0°C (low dew point)
Wind Speed3.2m/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✕33%5.6m/s
05:00✓33%5.6m/s
06:00✓33%5.4m/s
07:00✓33%5.3m/s
08:00✕49%5.4m/s
09:00✕68%5.5m/s
10:00✕70%5.9m/s
11:00✕68%6.2m/s
12:00✕66%6.3m/s
13:00✕66%6.2m/s
14:00✕51%6.2m/s
15:00✕51%6.2m/s
16:00✕44%5.9m/s
17:00✕46%5.2m/s
18:00✕46%5.1m/s
19:00✕46%4.9m/s
20:00✕48%4.5m/s
21:00✕59%4.1m/s
22:00✕59%4m/s
23:00✕59%3.8m/s
Thu, Apr 9
24:00✕59%3.7m/s
01:00✕59%3.5m/s
02:00✕54%3.5m/s
03:00✕50%3.3m/s
04:00✕50%3.4m/s
05:00✓50%3.2m/s
06:00✓50%3.1m/s
07:00✓65%3.1m/s
08:00✕74%3.8m/s
09:00✕74%4.1m/s
10:00✕72%4.1m/s
11:00✕80%4.2m/s
12:00✕64%4.4m/s
13:00✕56%4.5m/s
14:00✕57%4.3m/s
15:00✕62%4m/s
16:00✕65%3.8m/s
17:00✕62%3.5m/s
18:00✕40%3m/s
19:00✕42%2m/s
20:00✕61%2.1m/s
21:00✕61%2m/s
22:00✕61%1.8m/s
23:00✕63%1.6m/s
Fri, Apr 10
24:00✕63%1.5m/s
01:00✕63%1.6m/s
02:00✕63%1.6m/s
03:00✕63%1.6m/s
04:00✕61%1.7m/s
05:00✓76%1.7m/s
06:00✓76%1.9m/s
07:00✓78%1.7m/s
08:00✕76%2m/s
09:00✕72%2.6m/s
10:00✕72%2.8m/s
11:00✕61%2.7m/s
12:00✕57%2.8m/s
13:00✕51%2.8m/s
14:00✕48%2.9m/s
15:00✕33%2.8m/s
16:00✕26%3m/s
17:00✕26%3.1m/s
18:00✕33%2.6m/s
19:00✕33%2.3m/s
20:00✕39%2m/s
21:00✕39%2.1m/s
22:00✕46%2m/s
23:00✕46%2m/s
Sat, Apr 11
24:00✕46%2m/s
01:00✕42%1.9m/s
02:00✕42%2m/s
03:00✕38%2.1m/s
04:00✕48%2.3m/s
05:00✓52%2.2m/s
06:00✓52%2.4m/s
07:00✓76%2.6m/s
08:00✕63%3.1m/s
09:00✕74%3.7m/s
10:00✕50%3.6m/s
11:00✕48%3.6m/s
12:00✕4.7%3.5m/s
13:00✕4.9%3.1m/s
14:00✕48%2.7m/s
15:00✕35%2.3m/s
16:00✕27%2.2m/s
17:00✕24%2.1m/s
18:00✕18%2m/s
19:00✕17%1.9m/s
20:00✕22%1.8m/s
21:00✕22%1.7m/s
22:00✕22%1.8m/s
23:00✕22%1.9m/s
Sun, Apr 12
24:00✕22%2m/s
01:00✕22%2.6m/s
02:00✕28%3.1m/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
Thu, Apr 9 Sunrise 06:11 Sunset 20:18
05:00 ☾
-8°C 2.5°C -3°C - 0% 0.15kPa
06:00 ☾
-7.9°C 2.1°C -3.2°C - 2% 0.15kPa
07:00
-7.9°C 1.5°C -3°C - 7% 0.15kPa
08:00
-8.6°C 1.1°C -1.9°C - 5% 0.21kPa
09:00
-9.6°C 1°C -0.4°C - 5% 0.3kPa
10:00
-11°C 1°C 1.1°C - 6% 0.39kPa
11:00
-12°C 1°C 2.6°C - 4% 0.49kPa
12:00
-12°C 1.1°C 3.6°C - 5% 0.54kPa
13:00
-12°C 1.1°C 4.4°C - 29% 0.58kPa
14:00
-11°C 1.1°C 4.8°C - 20% 0.61kPa
15:00
-11°C 0.99°C 5.1°C - 50% 0.62kPa
16:00
-11°C 0.99°C 5°C - 40% 0.61kPa
17:00
-11°C 1.7°C 4.9°C - 21% 0.6kPa
18:00
-10°C 2.1°C 4.5°C - 100% 0.56kPa
19:00
-8.6°C 2.1°C 2.9°C - 100% 0.43kPa
20:00
-8.3°C 1.9°C 0.87°C - 100% 0.32kPa
21:00 ☾
-8.4°C 1.9°C -0.07°C - 100% 0.28kPa
22:00 ☾
-8.2°C 1.8°C -0.43°C - 100% 0.26kPa
23:00 ☾
-8.3°C 1.8°C -0.52°C - 100% 0.26kPa
Fri, Apr 10 Sunrise 06:11 Sunset 20:18
24:00 ☾
-8.7°C 1.8°C -0.73°C - 100% 0.26kPa
01:00 ☾
-8.5°C 1.8°C -0.52°C - 100% 0.27kPa
02:00 ☾
-8.2°C 1.7°C -0.52°C - 100% 0.26kPa
03:00 ☾
-8.1°C 1.6°C -0.7°C - 100% 0.25kPa
04:00 ☾
-8.2°C 1.6°C -0.95°C - 82% 0.24kPa
05:00 ☾
-8.7°C 1.6°C -1.6°C - 6% 0.22kPa
06:00 ☾
-9°C 1.6°C -2°C - 5% 0.22kPa
07:00
-9°C 1.4°C -1.6°C - 2% 0.24kPa
08:00
-9.4°C 1.2°C 0.27°C - 5% 0.32kPa
09:00
-10°C 1.2°C 2.2°C - 10% 0.44kPa
10:00
-11°C 1.2°C 3.7°C - 6% 0.54kPa
11:00
-12°C 1.3°C 5°C - 17% 0.63kPa
12:00
-12°C 1.3°C 6.2°C - 29% 0.71kPa
13:00
-12°C 1.3°C 6.9°C - 71% 0.75kPa
14:00
-12°C 1.7°C 7°C - 100% 0.76kPa
15:00
-12°C 2.7°C 7.1°C - 100% 0.76kPa
16:00
-11°C 3.4°C 6.7°C - 100% 0.72kPa
17:00
-11°C 3.9°C 6.3°C - 100% 0.68kPa
18:00
-8.7°C 4.1°C 5.4°C - 100% 0.58kPa
19:00
-8°C 4.1°C 4.2°C - 100% 0.49kPa
20:00
-7.3°C 3.7°C 2.5°C - 100% 0.38kPa
21:00 ☾
-7.4°C 3.3°C 1.3°C - 100% 0.32kPa
22:00 ☾
-6.9°C 2.8°C 1.1°C - 100% 0.29kPa
23:00 ☾
-6.6°C 2.3°C 0.65°C - 100% 0.27kPa
Sat, Apr 11 Sunrise 06:08 Sunset 20:21
24:00 ☾
-6.3°C 2°C 0.18°C - 100% 0.24kPa
01:00 ☾
-6.2°C 2°C -0.21°C - 100% 0.22kPa
02:00 ☾
-6.1°C 2°C -0.31°C - 100% 0.21kPa
03:00 ☾
-6.1°C 2°C -0.71°C - 78% 0.19kPa
04:00 ☾
-6.4°C 2°C -1.1°C - 12% 0.19kPa
05:00 ☾
-6.6°C 2°C -1.3°C - 5% 0.18kPa
06:00 ☾
-6.8°C 2°C -1.2°C - 5% 0.19kPa
07:00
-6.8°C 1.7°C -0.54°C - 5% 0.22kPa
08:00
-6.6°C 1.6°C 1.2°C - 56% 0.29kPa
09:00
-6.5°C 1.6°C 3°C - 5% 0.38kPa
10:00
-4.1°C 3.2°C 5°C - 5% 0.42kPa
11:00
-1.6°C 4.8°C 7°C - 5% 0.46kPa
12:00
0.8°C 6.4°C 9°C - 6% 0.5kPa
13:00
1.2°C 6.1°C 7.4°C - 5% 0.36kPa
14:00
1.3°C 5.9°C 5.8°C - 4% 0.25kPa
15:00
1.2°C 5.7°C 4.2°C - 4% 0.16kPa
16:00
1.2°C 5.2°C 3.8°C - 27% 0.13kPa
17:00
1.2°C 4.7°C 3.3°C - 51% 0.11kPa
18:00
1.2°C 4.3°C 2.9°C - 74% 0.09kPa
19:00
1.3°C 4.1°C 3.3°C - 83% 0.1kPa
20:00
1.4°C 3.9°C 3.6°C - 91% 0.12kPa
21:00 ☾
1.5°C 3.7°C 4°C - 100% 0.13kPa
22:00 ☾
1.5°C 3.6°C 3.8°C - 100% 0.12kPa
23:00 ☾
1.4°C 3.5°C 3.7°C - 100% 0.12kPa
Sun, Apr 12 Sunrise 06:05 Sunset 20:23
24:00 ☾
1.4°C 3.4°C 3.5°C - 100% 0.11kPa
01:00 ☾
1.2°C 3.5°C 4.1°C - 100% 0.15kPa
02:00 ☾
1.1°C 3.5°C 4.6°C - 99% 0.19kPa
03:00 ☾
0.9°C 3.6°C 5.2°C - 99% 0.23kPa
04:00 ☾
0.7°C 4°C 5.4°C - 99% 0.25kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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