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More Morning Frost in Southern Finland
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Rule Morning Frost

Kurjenrahka - Morning Frost - Southern Finland

Turku, Southwest Finland, 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)
Time Window 88% failing
Wind Speed 88% failing
Frost Probability 75% failing

Currently

Real-time conditions
Frost Probability
70%
Soil Temperature1.9°C
Dew Point-9.6°C (low dew point)
Wind Speed3.1m/s (calm conditions)
Cloud Cover5%

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
10:00✕53%4.7m/s
11:00✕50%4.9m/s
12:00✕48%4.9m/s
13:00✕46%4.8m/s
14:00✕44%5m/s
15:00✕44%4.8m/s
16:00✕44%4.8m/s
17:00✕44%4.6m/s
18:00✕44%4.2m/s
19:00✕48%3.9m/s
20:00✕50%3.5m/s
21:00✕52%2.8m/s
22:00✕54%2.6m/s
23:00✕54%2.2m/s
Thu, Apr 9
24:00✕45%2.3m/s
01:00✕45%2.5m/s
02:00✕45%2.4m/s
03:00✕45%2m/s
04:00✕52%1.9m/s
05:00✓52%1.9m/s
06:00✓52%1.8m/s
07:00✓52%2.1m/s
08:00✓76%2.6m/s
09:00✕70%3.2m/s
10:00✕70%3.3m/s
11:00✕70%3.1m/s
12:00✕66%2.9m/s
13:00✕63%2.8m/s
14:00✕48%2.9m/s
15:00✕35%2.7m/s
16:00✕28%2.6m/s
17:00✕26%2.6m/s
18:00✕26%2.2m/s
19:00✕35%2.9m/s
20:00✕30%2.8m/s
21:00✕30%2.1m/s
22:00✕37%2m/s
23:00✕39%1.4m/s
Fri, Apr 10
24:00✕39%1m/s
01:00✕48%1.8m/s
02:00✕52%2.1m/s
03:00✕52%2m/s
04:00✕52%2m/s
05:00✓56%2.1m/s
06:00✓71%2.2m/s
07:00✓67%2.3m/s
08:00✕68%2.4m/s
09:00✕66%2.8m/s
10:00✕57%2.6m/s
11:00✕57%2.2m/s
12:00✕57%1.7m/s
13:00✕59%1.3m/s
14:00✕56%1.1m/s
15:00✕41%1m/s
16:00✕49%1.2m/s
17:00✕47%1.3m/s
18:00✕48%1.8m/s
19:00✕42%2.1m/s
20:00✕33%2m/s
21:00✕30%1.7m/s
22:00✕37%1.5m/s
23:00✕44%1.4m/s
Sat, Apr 11
24:00✕48%1.7m/s
01:00✕46%1.8m/s
02:00✕46%1.8m/s
03:00✕72%2m/s
04:00✕67%2m/s
05:00✓67%2.1m/s
06:00✓67%2.2m/s
07:00✓72%2.2m/s
08:00✕76%2.3m/s
09:00✕74%2.9m/s
10:00✕70%3.3m/s
11:00✕70%3.2m/s
12:00✕52%2.9m/s
13:00✕45%2.8m/s
14:00✕45%2.7m/s
15:00✕45%2.4m/s
16:00✕48%2.1m/s
17:00✕52%1.9m/s
18:00✕50%1.7m/s
19:00✕48%1.7m/s
20:00✕50%1.8m/s
21:00✕45%1.9m/s
22:00✕52%2m/s
23:00✕52%2.1m/s
Sun, Apr 12
24:00✕52%2.3m/s
01:00✕52%2.7m/s
02:00✕50%3.1m/s
03:00✕55%3.5m/s
04:00✕48%3.5m/s
05:00✓39%3.5m/s
06:00✓34%3.5m/s
07:00✓34%3.5m/s
08:00✕33%3.4m/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 06:31 Sunset 20:34
11:00
-9.6°C 1.9°C 3.9°C - 5% 0.51kPa
12:00
-10°C 1.9°C 5.1°C - 5% 0.59kPa
13:00
-10°C 2°C 6.2°C - 6% 0.67kPa
14:00
-10°C 2°C 6.9°C - 100% 0.71kPa
15:00
-10°C 2.6°C 7.3°C - 100% 0.74kPa
16:00
-10°C 3.5°C 7.4°C - 100% 0.75kPa
17:00
-10°C 4.1°C 7.2°C - 100% 0.73kPa
18:00
-8.9°C 4.4°C 6.8°C - 100% 0.68kPa
19:00
-4.5°C 4.5°C 3.6°C - 100% 0.36kPa
20:00
-4.4°C 3.9°C 0.24°C - 100% 0.18kPa
21:00 ☾
-4.2°C 3.3°C -0.27°C - 100% 0.15kPa
22:00 ☾
-4°C 2.8°C -0.12°C - 100% 0.15kPa
23:00 ☾
-4.2°C 2.6°C -0.33°C - 100% 0.15kPa
Fri, Apr 10 Sunrise 06:31 Sunset 20:34
24:00 ☾
-4.9°C 2.6°C -0.52°C - 97% 0.16kPa
01:00 ☾
-5.4°C 2.5°C -0.58°C - 23% 0.18kPa
02:00 ☾
-6°C 2.5°C -0.71°C - 6% 0.19kPa
03:00 ☾
-6.6°C 2.4°C -0.91°C - 5% 0.2kPa
04:00 ☾
-7°C 2.3°C -1°C - 5% 0.2kPa
05:00 ☾
-7.2°C 2°C -1.2°C - 5% 0.2kPa
06:00 ☾
-7.3°C 1.8°C -1.3°C - 5% 0.2kPa
07:00
-7.4°C 1.4°C -1.3°C - 13% 0.2kPa
08:00
-7.4°C 1.2°C -0.05°C - 30% 0.26kPa
09:00
-8.2°C 1.3°C 1.7°C - 32% 0.36kPa
10:00
-8.3°C 1.3°C 3.2°C - 100% 0.44kPa
11:00
-8.2°C 1.4°C 4°C - 100% 0.48kPa
12:00
-8°C 1.4°C 5°C - 100% 0.53kPa
13:00
-7.6°C 1.4°C 5.9°C - 100% 0.58kPa
14:00
-7.1°C 1.9°C 6.4°C - 100% 0.61kPa
15:00
-7.1°C 2.9°C 6.7°C - 89% 0.63kPa
16:00
-7.3°C 4°C 7.1°C - 5% 0.65kPa
17:00
-7.4°C 4.9°C 7.1°C - 5% 0.66kPa
18:00
-6.2°C 5.1°C 6.4°C - 5% 0.57kPa
19:00
-4.8°C 5.1°C 4.4°C - 34% 0.41kPa
20:00
-3.9°C 4.7°C 2°C - 100% 0.25kPa
21:00 ☾
-4.2°C 4.1°C 0.74°C - 100% 0.2kPa
22:00 ☾
-4.3°C 3.5°C 0.91°C - 100% 0.21kPa
23:00 ☾
-4.2°C 3°C 1.3°C - 100% 0.22kPa
Sat, Apr 11 Sunrise 06:28 Sunset 20:37
24:00 ☾
-4.4°C 2.6°C 1.6°C - 100% 0.25kPa
01:00 ☾
-4.9°C 2.3°C 1.8°C - 100% 0.27kPa
02:00 ☾
-4.9°C 2.1°C 1.8°C - 85% 0.27kPa
03:00 ☾
-5.1°C 1.7°C 0.7°C - 0% 0.22kPa
04:00 ☾
-5.5°C 1.7°C -0.12°C - 0% 0.2kPa
05:00 ☾
-5.9°C 1.6°C -0.43°C - 0% 0.2kPa
06:00 ☾
-6.3°C 1.6°C -0.66°C - 0% 0.2kPa
07:00
-6.5°C 1.6°C -0.61°C - 0% 0.21kPa
08:00
-6.1°C 1.4°C 0.93°C - 0% 0.27kPa
09:00
-6.7°C 1.5°C 3°C - 0% 0.38kPa
10:00
-7.5°C 1.5°C 4.8°C - 0% 0.51kPa
11:00
-7.7°C 1.6°C 6°C - 5% 0.59kPa
12:00
-6.5°C 2.3°C 7.2°C - 5% 0.64kPa
13:00
-5.5°C 3.5°C 8.2°C - 5% 0.68kPa
14:00
-4.2°C 4.6°C 9.1°C - 5% 0.71kPa
15:00
-3.3°C 5.7°C 9.7°C - 5% 0.72kPa
16:00
-2.8°C 5.5°C 7.4°C - 5% 0.53kPa
17:00
-2.7°C 5.2°C 5°C - 5% 0.37kPa
18:00
-3°C 5°C 2.7°C - 5% 0.25kPa
19:00
-2.9°C 4.5°C 2.4°C - 5% 0.23kPa
20:00
-2.9°C 3.9°C 2.1°C - 5% 0.22kPa
21:00 ☾
-2.8°C 3.4°C 1.8°C - 5% 0.2kPa
22:00 ☾
-2.6°C 3°C 1.5°C - 5% 0.18kPa
23:00 ☾
-2.5°C 2.6°C 1.2°C - 5% 0.16kPa
Sun, Apr 12 Sunrise 06:25 Sunset 20:39
24:00 ☾
-2.3°C 2.2°C 0.95°C - 5% 0.14kPa
01:00 ☾
-1.8°C 2.2°C 2°C - 5% 0.17kPa
02:00 ☾
-1.3°C 2.2°C 3°C - 5% 0.2kPa
03:00 ☾
-0.9°C 2.2°C 4°C - 5% 0.24kPa
04:00 ☾
-0.9°C 3°C 5.3°C - 24% 0.32kPa
05:00 ☾
-1.1°C 3.8°C 6.6°C - 44% 0.41kPa
06:00 ☾
-1.4°C 4.7°C 7.8°C - 63% 0.51kPa
07:00
-1.4°C 5.2°C 7.8°C - 75% 0.51kPa
08:00
-1.4°C 5.7°C 7.8°C - 88% 0.51kPa
09:00
-1.5°C 6.2°C 7.8°C - 100% 0.51kPa
10:00
-1.2°C 6.3°C 7.6°C - 99% 0.48kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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