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More Morning Frost in Southern Finland
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Rule Morning Frost

Aulanko - Morning Frost - Southern Finland

Hämeenlinna, Kanta-Häme, 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 71% failing

Currently

Real-time conditions
Frost Probability
70%
Soil Temperature1.6°C
Dew Point-10.9°C (low dew point)
Wind Speed3.2m/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 74 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
Thu, Apr 9
07:00✓52%2.1m/s
08:00✕74%2.9m/s
09:00✕74%3m/s
10:00✕72%3m/s
11:00✕70%3.2m/s
12:00✕62%3.1m/s
13:00✕48%3.2m/s
14:00✕48%3.3m/s
15:00✕48%3.4m/s
16:00✕48%3.4m/s
17:00✕48%3.4m/s
18:00✕42%2.7m/s
19:00✕42%2.2m/s
20:00✕46%2.1m/s
21:00✕46%2.1m/s
22:00✕46%2.1m/s
23:00✕46%2.1m/s
Fri, Apr 10
24:00✕46%1.9m/s
01:00✕48%1.7m/s
02:00✕43%1.5m/s
03:00✕55%1.5m/s
04:00✕49%1.6m/s
05:00✓52%1.6m/s
06:00✓49%1.7m/s
07:00✓63%1.6m/s
08:00✕61%1.8m/s
09:00✕59%2.1m/s
10:00✕58%2.2m/s
11:00✕60%2.1m/s
12:00✕65%2.4m/s
13:00✕65%2.3m/s
14:00✕65%2m/s
15:00✕63%1.9m/s
16:00✕48%1.9m/s
17:00✕26%2.1m/s
18:00✕28%2m/s
19:00✕35%2m/s
20:00✕39%2.3m/s
21:00✕39%2.2m/s
22:00✕46%2.1m/s
23:00✕46%1.9m/s
Sat, Apr 11
24:00✕46%1.8m/s
01:00✕61%1.9m/s
02:00✕61%1.9m/s
03:00✕61%1.9m/s
04:00✕52%1.9m/s
05:00✓52%2m/s
06:00✓52%2m/s
07:00✓52%1.9m/s
08:00✕76%2.2m/s
09:00✕70%2.8m/s
10:00✕59%2.9m/s
11:00✕62%3m/s
12:00✕56%3m/s
13:00✕67%3.1m/s
14:00✕45%3.1m/s
15:00✕43%3.1m/s
16:00✕48%2.8m/s
17:00✕43%2.4m/s
18:00✕43%2.1m/s
19:00✕43%2m/s
20:00✕46%1.9m/s
21:00✕44%1.9m/s
22:00✕48%1.9m/s
23:00✕48%1.9m/s
Sun, Apr 12
24:00✕48%1.9m/s
01:00✕67%2.3m/s
02:00✕67%2.6m/s
03:00✕70%3m/s
04:00✕47%3.2m/s
05:00✓48%3.4m/s
06:00✓36%3.6m/s
07:00✓36%3.6m/s
08:00✕33%3.5m/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 06:21 Sunset 20:27
11:00
-11°C 1.6°C 3.1°C - 5% 0.5kPa
12:00
-12°C 1.6°C 4.4°C - 24% 0.59kPa
13:00
-12°C 1.6°C 5.7°C - 100% 0.67kPa
14:00
-12°C 1.6°C 6.2°C - 97% 0.71kPa
15:00
-12°C 1.6°C 6.8°C - 100% 0.75kPa
16:00
-12°C 1.6°C 6.9°C - 100% 0.75kPa
17:00
-11°C 2°C 6.5°C - 100% 0.71kPa
18:00
-9°C 2.5°C 5.5°C - 100% 0.59kPa
19:00
-7.6°C 2.6°C 3.9°C - 100% 0.46kPa
20:00
-7.1°C 2.4°C 1.8°C - 100% 0.34kPa
21:00 ☾
-7.4°C 2.2°C 0.33°C - 100% 0.28kPa
22:00 ☾
-7.4°C 2.1°C -0.32°C - 100% 0.25kPa
23:00 ☾
-7.4°C 2.1°C -0.73°C - 100% 0.23kPa
Fri, Apr 10 Sunrise 06:21 Sunset 20:27
24:00 ☾
-7.4°C 2.1°C -1.1°C - 100% 0.21kPa
01:00 ☾
-7.7°C 2.1°C -1.5°C - 99% 0.21kPa
02:00 ☾
-7.9°C 2.1°C -1.6°C - 99% 0.2kPa
03:00 ☾
-8.2°C 2.1°C -1.7°C - 38% 0.21kPa
04:00 ☾
-8.7°C 2.1°C -1.9°C - 61% 0.21kPa
05:00 ☾
-9.1°C 2.1°C -2.1°C - 54% 0.22kPa
06:00 ☾
-9.3°C 2.1°C -2.1°C - 78% 0.22kPa
07:00
-9.4°C 1.7°C -1.9°C - 100% 0.23kPa
08:00
-9.4°C 1.4°C -0.55°C - 100% 0.29kPa
09:00
-10°C 1.4°C 1.2°C - 99% 0.38kPa
10:00
-11°C 1.4°C 2.8°C - 69% 0.49kPa
11:00
-12°C 1.4°C 4.2°C - 34% 0.58kPa
12:00
-12°C 1.4°C 5.6°C - 5% 0.67kPa
13:00
-12°C 1.4°C 6.7°C - 5% 0.74kPa
14:00
-12°C 1.4°C 7.4°C - 5% 0.79kPa
15:00
-11°C 1.5°C 7.9°C - 5% 0.81kPa
16:00
-11°C 2.5°C 8.1°C - 5% 0.82kPa
17:00
-11°C 3.3°C 8.1°C - 88% 0.81kPa
18:00
-8.6°C 3.7°C 7.6°C - 99% 0.72kPa
19:00
-6.2°C 3.9°C 5.6°C - 100% 0.52kPa
20:00
-5.9°C 3.7°C 3.5°C - 100% 0.39kPa
21:00 ☾
-6.3°C 3.4°C 1.8°C - 100% 0.32kPa
22:00 ☾
-6.4°C 3°C 1.4°C - 100% 0.3kPa
23:00 ☾
-6.4°C 2.7°C 1.4°C - 100% 0.3kPa
Sat, Apr 11 Sunrise 06:18 Sunset 20:30
24:00 ☾
-6.9°C 2.4°C 1.1°C - 100% 0.3kPa
01:00 ☾
-7.3°C 2.2°C 0.23°C - 8% 0.27kPa
02:00 ☾
-7.4°C 2.1°C -0.62°C - 5% 0.23kPa
03:00 ☾
-7.2°C 2.2°C -0.9°C - 5% 0.22kPa
04:00 ☾
-7°C 2.2°C -1.1°C - 5% 0.2kPa
05:00 ☾
-6.8°C 2.2°C -1.3°C - 3% 0.19kPa
06:00 ☾
-6.8°C 2.2°C -1.6°C - 3% 0.18kPa
07:00
-6.7°C 2.1°C -1.1°C - 5% 0.19kPa
08:00
-6.9°C 1.9°C 0.83°C - 5% 0.28kPa
09:00
-7.7°C 1.9°C 2.9°C - 5% 0.41kPa
10:00
-7.8°C 1.9°C 4.7°C - 48% 0.51kPa
11:00
-6.8°C 1.9°C 6.2°C - 25% 0.58kPa
12:00
-5.1°C 1.9°C 7.4°C - 48% 0.61kPa
13:00
-3.6°C 1.9°C 8.5°C - 5% 0.64kPa
14:00
-2.6°C 3.1°C 9.2°C - 5% 0.66kPa
15:00
-1.9°C 4.1°C 9.9°C - 5% 0.68kPa
16:00
-2.7°C 4°C 7.1°C - 23% 0.5kPa
17:00
-3.8°C 3.9°C 4.2°C - 41% 0.36kPa
18:00
-5.1°C 3.8°C 1.4°C - 59% 0.26kPa
19:00
-5°C 3.3°C 1°C - 50% 0.24kPa
20:00
-4.8°C 2.8°C 0.68°C - 41% 0.21kPa
21:00 ☾
-4.7°C 2.4°C 0.32°C - 32% 0.19kPa
22:00 ☾
-4.1°C 2.3°C 0.16°C - 25% 0.17kPa
23:00 ☾
-3.7°C 2.2°C 0.009°C - 18% 0.15kPa
Sun, Apr 12 Sunrise 06:15 Sunset 20:32
24:00 ☾
-3.2°C 2°C -0.15°C - 11% 0.12kPa
01:00 ☾
-2.3°C 2°C 1.3°C - 9% 0.16kPa
02:00 ☾
-1.5°C 1.9°C 2.7°C - 7% 0.19kPa
03:00 ☾
-0.7°C 1.8°C 4.1°C - 5% 0.24kPa
04:00 ☾
-0.7°C 2.3°C 5.2°C - 25% 0.3kPa
05:00 ☾
-0.8°C 2.8°C 6.3°C - 45% 0.37kPa
06:00 ☾
-1°C 3.3°C 7.3°C - 66% 0.45kPa
07:00
-1°C 3.8°C 7.2°C - 77% 0.45kPa
08:00
-1.1°C 4.4°C 7.1°C - 89% 0.45kPa
09:00
-1.2°C 4.9°C 7°C - 100% 0.44kPa
10:00
-1.1°C 5°C 6.7°C - 98% 0.42kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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