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More Morning Frost in Southern Finland
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Rule Morning Frost

Punkaharju - Morning Frost - Southern Finland

Punkaharju, South Savo, 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
Wind Speed 100% failing
Time Window 88% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature9725.9°C
Dew Point-7.4°C (low dew point)
Wind Speed5.5m/s (moderate winds)
Cloud Cover3%

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 91 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
08:00✕0%8.9m/s
09:00✕0%8.8m/s
10:00✕0%8.9m/s
11:00✕0%8.5m/s
12:00✕0%8.1m/s
13:00✕0%8m/s
14:00✕0%7.8m/s
15:00✕0%7.7m/s
16:00✕0%7.7m/s
17:00✕0%7.6m/s
18:00✕0%7.5m/s
19:00✕0%7.4m/s
20:00✕0%7m/s
21:00✕0%6.7m/s
22:00✕0%6.2m/s
23:00✕0%6.3m/s
Thu, Apr 9
24:00✕0%6.1m/s
01:00✕0%5.8m/s
02:00✕0%5.8m/s
03:00✕0%5.7m/s
04:00✕0%5.5m/s
05:00✓0%5.5m/s
06:00✓0%5m/s
07:00✓0%4.8m/s
08:00✕0%5.2m/s
09:00✕0%5.2m/s
10:00✕0%4.6m/s
11:00✕0%4.1m/s
12:00✕0%3.7m/s
13:00✕0%3.3m/s
14:00✕0%3m/s
15:00✕0%2.9m/s
16:00✕0%2.8m/s
17:00✕0%2.9m/s
18:00✕0%2.6m/s
19:00✕0%2.4m/s
20:00✕0%2.5m/s
21:00✕0%2.5m/s
22:00✕0%2.4m/s
23:00✕0%2.2m/s
Fri, Apr 10
24:00✕0%2m/s
01:00✕0%1.8m/s
02:00✕0%1.8m/s
03:00✕0%2.1m/s
04:00✕0%2.1m/s
05:00✓0%2.1m/s
06:00✓0%2.1m/s
07:00✓0%2.2m/s
08:00✕0%2.5m/s
09:00✕0%2.6m/s
10:00✕0%2.5m/s
11:00✕0%2.6m/s
12:00✕0%2.6m/s
13:00✕0%2.5m/s
14:00✕0%2.5m/s
15:00✕0%2.7m/s
16:00✕0%2.8m/s
17:00✕0%2.8m/s
18:00✕0%2.7m/s
19:00✕0%2.6m/s
20:00✕0%2.8m/s
21:00✕0%2.8m/s
22:00✕0%3.1m/s
23:00✕0%2.9m/s
Sat, Apr 11
24:00✕0%2.5m/s
01:00✕0%2.5m/s
02:00✕0%2.7m/s
03:00✕0%2.8m/s
04:00✕0%2.8m/s
05:00✓0%2.8m/s
06:00✓0%2.8m/s
07:00✓0%3m/s
08:00✕0%3.2m/s
09:00✕0%3.3m/s
10:00✕0%2.7m/s
11:00✕0%2.2m/s
12:00✕52%1.6m/s
13:00✕42%1.9m/s
14:00✕49%2.1m/s
15:00✕41%2.4m/s
16:00✕38%2.4m/s
17:00✕29%2.4m/s
18:00✕41%2.4m/s
19:00✕41%2.3m/s
20:00✕41%2.1m/s
21:00✕41%2m/s
22:00✕51%1.9m/s
23:00✕51%1.9m/s
Sun, Apr 12
24:00✕51%1.9m/s
01:00✕51%2.2m/s
02:00✕51%2.4m/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 06:00 Sunset 20:09
05:00 ☾
-7.4°C 9726°C -2.9°C - 3% 0.14kPa
06:00 ☾
-7.5°C 9726°C -3°C - 0% 0.14kPa
07:00
-7.6°C 9726°C -2.9°C - 3% 0.15kPa
08:00
-7.7°C 9726°C -2.3°C - 5% 0.17kPa
09:00
-8.5°C 9726°C -1.4°C - 5% 0.23kPa
10:00
-9.1°C 9726°C -0.37°C - 5% 0.29kPa
11:00
-9.3°C 9726°C 0.94°C - 5% 0.35kPa
12:00
-9.2°C 9726°C 1.9°C - 5% 0.4kPa
13:00
-9.2°C 9726°C 2.8°C - 32% 0.44kPa
14:00
-9°C 9726°C 3.4°C - 26% 0.47kPa
15:00
-8.6°C 9726°C 3.8°C - 45% 0.48kPa
16:00
-8.6°C 9726°C 4°C - 65% 0.49kPa
17:00
-8°C 9726°C 4°C - 66% 0.48kPa
18:00
-7.2°C 9726°C 3.5°C - 100% 0.43kPa
19:00
-6.3°C 9726°C 2.3°C - 100% 0.34kPa
20:00
-6.2°C 9726°C 1.3°C - 100% 0.29kPa
21:00 ☾
-6.2°C 9726°C 0.53°C - 100% 0.25kPa
22:00 ☾
-6°C 9726°C 0.07°C - 100% 0.22kPa
23:00 ☾
-5.9°C 9726°C -0.12°C - 100% 0.21kPa
Fri, Apr 10 Sunrise 06:00 Sunset 20:09
24:00 ☾
-6°C 9726°C -0.43°C - 100% 0.2kPa
01:00 ☾
-6°C 9726°C -0.42°C - 61% 0.2kPa
02:00 ☾
-6.4°C 9726°C -0.82°C - 17% 0.2kPa
03:00 ☾
-6.9°C 9726°C -1°C - 5% 0.2kPa
04:00 ☾
-7.2°C 9726°C -1.2°C - 5% 0.2kPa
05:00 ☾
-7.5°C 9726°C -1.4°C - 5% 0.2kPa
06:00
-7.8°C 9726°C -1.5°C - 5% 0.21kPa
07:00
-8.1°C 9726°C -1.3°C - 5% 0.23kPa
08:00
-8.5°C 9726°C -0.33°C - 7% 0.27kPa
09:00
-9°C 9726°C 0.69°C - 29% 0.33kPa
10:00
-9°C 9726°C 1.7°C - 55% 0.38kPa
11:00
-8.9°C 9726°C 2.5°C - 97% 0.42kPa
12:00
-8.9°C 9726°C 3.2°C - 100% 0.46kPa
13:00
-8.7°C 9726°C 3.7°C - 100% 0.48kPa
14:00
-8.5°C 9726°C 4.1°C - 100% 0.5kPa
15:00
-8.2°C 9726°C 4.5°C - 100% 0.51kPa
16:00
-7.3°C 9726°C 4.5°C - 100% 0.49kPa
17:00
-5.9°C 9726°C 4.4°C - 100% 0.44kPa
18:00
-5.2°C 9726°C 3.9°C - 100% 0.39kPa
19:00
-4.4°C 9726°C 3.1°C - 100% 0.32kPa
20:00
-4.4°C 9726°C 2.3°C - 100% 0.28kPa
21:00 ☾
-4.4°C 9726°C 1.6°C - 100% 0.24kPa
22:00 ☾
-4.7°C 9726°C 1.3°C - 100% 0.24kPa
23:00 ☾
-5°C 9726°C 0.95°C - 100% 0.23kPa
Sat, Apr 11 Sunrise 05:56 Sunset 20:12
24:00 ☾
-5.1°C 9726°C 0.18°C - 66% 0.2kPa
01:00 ☾
-5.5°C 9726°C -0.41°C - 28% 0.19kPa
02:00 ☾
-5.8°C 9726°C -0.61°C - 47% 0.19kPa
03:00 ☾
-6°C 9726°C -0.71°C - 66% 0.19kPa
04:00 ☾
-6.1°C 9726°C -0.82°C - 89% 0.19kPa
05:00 ☾
-6.1°C 9726°C -0.83°C - 55% 0.19kPa
06:00
-6.1°C 9726°C -0.84°C - 5% 0.19kPa
07:00
-5.8°C 9726°C -0.34°C - 23% 0.2kPa
08:00
-5.1°C 9726°C 0.78°C - 29% 0.23kPa
09:00
-3.7°C 9726°C 2°C - 13% 0.24kPa
10:00
-2.6°C 6485°C 3.4°C - 13% 0.28kPa
11:00
-1.6°C 3244°C 4.8°C - 13% 0.32kPa
12:00
-0.6°C 3.2°C 6.2°C - 13% 0.36kPa
13:00
-0.4°C 3°C 5.2°C - 26% 0.29kPa
14:00
-0.4°C 2.8°C 4.2°C - 40% 0.23kPa
15:00
-0.4°C 2.7°C 3.2°C - 54% 0.17kPa
16:00
-0.4°C 2.4°C 2.7°C - 69% 0.15kPa
17:00
-0.4°C 2.1°C 2.2°C - 84% 0.12kPa
18:00
-0.5°C 1.8°C 1.7°C - 100% 0.1kPa
19:00
-0.6°C 1.6°C 1.4°C - 100% 0.09kPa
20:00
-0.7°C 1.3°C 1.1°C - 100% 0.08kPa
21:00 ☾
-0.8°C 1.1°C 0.81°C - 100% 0.07kPa
22:00 ☾
-0.4°C 0.97°C 1°C - 100% 0.07kPa
23:00 ☾
-0.1°C 0.83°C 1.3°C - 100% 0.06kPa
Sun, Apr 12 Sunrise 05:53 Sunset 20:15
24:00 ☾
0.2°C 0.69°C 1.5°C - 100% 0.06kPa
01:00 ☾
0.5°C 0.77°C 2°C - 100% 0.07kPa
02:00 ☾
0.7°C 0.84°C 2.4°C - 100% 0.09kPa
03:00 ☾
0.9°C 0.91°C 2.9°C - 100% 0.1kPa
04:00 ☾
0.4°C 1.1°C 3°C - 100% 0.13kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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