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Rule Morning Frost

Liesjärvi - Morning Frost - Southern Finland

Liesjärven Kansallispuisto, Kanta-Häme, Finland

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Frost Probability
29%
Soil Temperature5.4°C
Dew Point2.0°C (low dew point)
Wind Speed5.0m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki
Next opportunity
Moderate Frost (radiative) at Sunrise
Liesjärvi
Sun, Mar 22 · 05:35–06:00 · 1h window
Low confidence
36%
❄️Frost Probability76%
Soil Temperature: 1.3°C
Dew Point: -1.8°C (low dew point)
Wind Speed: 1.4m/s (calm conditions)
Cloud Cover: 5%
thermometer-snow weather icon
Moderate Frost (radiative) at Sunrise
Liesjärvi
Mon, Mar 23 · 05:32–06:00
❄️Frost Probability:76%
Low

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 80 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
Sun, Mar 15
06:00✓16%4.3m/s
07:00✓16%4.5m/s
08:00✓24%4.7m/s
09:00✕26%4.7m/s
10:00✕31%4.8m/s
11:00✕29%5m/s
12:00✕29%5m/s
13:00✕29%5m/s
14:00✕29%4.8m/s
15:00✕29%5m/s
16:00✕29%4.9m/s
17:00✕24%5.1m/s
18:00✕16%5.1m/s
19:00✕9%5.1m/s
20:00✕9%5.1m/s
21:00✕13%3.9m/s
22:00✕13%2.9m/s
23:00✕15%2.4m/s
Mon, Mar 16
24:00✕22%2.2m/s
01:00✕22%2.3m/s
02:00✕22%2.5m/s
03:00✕22%2.6m/s
04:00✕22%2.7m/s
05:00✓39%3.3m/s
06:00✓37%2.7m/s
07:00✓39%2.9m/s
08:00✓39%3m/s
09:00✕39%3.1m/s
10:00✕39%3.2m/s
11:00✕39%3.2m/s
12:00✕27%3.4m/s
13:00✕27%3.4m/s
14:00✕27%3.3m/s
15:00✕35%3.3m/s
16:00✕29%2.7m/s
17:00✕26%2.7m/s
18:00✕26%2.7m/s
19:00✕26%2.6m/s
20:00✕22%2.4m/s
21:00✕37%2.2m/s
22:00✕37%1.8m/s
23:00✕37%1.8m/s
Tue, Mar 17
24:00✕37%2.3m/s
01:00✕37%1.9m/s
02:00✕39%1.5m/s
03:00✕39%1.6m/s
04:00✕37%1.8m/s
05:00✓37%2.1m/s
06:00✓47%2m/s
07:00✓47%2.3m/s
08:00✓51%2.7m/s
09:00✕39%3.2m/s
10:00✕35%3.5m/s
11:00✕35%3.3m/s
12:00✕35%3.1m/s
13:00✕39%2.9m/s
14:00✕50%3.4m/s
15:00✕47%3.4m/s
16:00✕51%3.7m/s
17:00✕46%3.4m/s
18:00✕42%3.3m/s
19:00✕42%3.3m/s
20:00✕54%3.4m/s
21:00✕46%3.3m/s
22:00✕40%3.2m/s
23:00✕45%3.1m/s
Wed, Mar 18
24:00✕49%3.4m/s
01:00✕49%3.7m/s
02:00✕49%4m/s
03:00✕50%4.3m/s
04:00✕50%4.6m/s
05:00✓58%5m/s
06:00✓50%5.1m/s
07:00✓50%5.2m/s
08:00✓50%5.3m/s
09:00✕37%5.3m/s
10:00✕37%5.3m/s
11:00✕37%5.3m/s
12:00✕37%5.3m/s
13:00✕22%5.4m/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
Sun, Mar 15 Sunrise 06:42 Sunset 18:25
15:00
2°C 5.4°C 6.2°C - 100% 0.25kPa
16:00
1.7°C 5.3°C 5.6°C - 100% 0.21kPa
17:00
1.7°C 5.1°C 4.9°C - 100% 0.18kPa
18:00
2.2°C 4.8°C 4.3°C - 100% 0.12kPa
19:00 ☾
2.8°C 4.4°C 3.4°C - 100% 0.03kPa
20:00 ☾
2.6°C 4.1°C 3.1°C - 100% 0.03kPa
21:00 ☾
1.6°C 3.8°C 2.2°C - 100% 0.03kPa
22:00 ☾
1.3°C 3.4°C 1.7°C - 100% 0.02kPa
23:00 ☾
1.5°C 3.1°C 1.6°C - 100% 0.01kPa
Mon, Mar 16 Sunrise 06:42 Sunset 18:25
24:00 ☾
1.5°C 2.8°C 1.6°C - 100% 0.01kPa
01:00 ☾
1.5°C 2.6°C 1.7°C - 100% 0.01kPa
02:00 ☾
1.1°C 2.4°C 1.6°C - 100% 0.02kPa
03:00 ☾
1.1°C 2.2°C 1.5°C - 100% 0.02kPa
04:00 ☾
1.2°C 2°C 1.6°C - 100% 0.02kPa
05:00 ☾
0.1°C 1.9°C 1.2°C - 100% 0.05kPa
06:00 ☾
0.4°C 1.7°C 1.3°C - 100% 0.04kPa
07:00
0.2°C 1.6°C 1.2°C - 100% 0.05kPa
08:00
-0.2°C 1.5°C 1.4°C - 100% 0.07kPa
09:00
-0.2°C 1.5°C 1.7°C - 99% 0.09kPa
10:00
0.4°C 1.7°C 2.3°C - 99% 0.09kPa
11:00
0.7°C 2°C 2.6°C - 100% 0.1kPa
12:00
0.9°C 2.2°C 3.1°C - 100% 0.11kPa
13:00
0.8°C 2.6°C 3.3°C - 100% 0.12kPa
14:00
0.5°C 2.6°C 3.3°C - 100% 0.14kPa
15:00
0°C 2.7°C 3.1°C - 100% 0.15kPa
16:00
0.5°C 2.7°C 2.9°C - 100% 0.12kPa
17:00
0.8°C 2.5°C 2.7°C - 100% 0.09kPa
18:00
0.7°C 2.5°C 2.2°C - 100% 0.08kPa
19:00 ☾
0.7°C 2.3°C 2°C - 100% 0.06kPa
20:00 ☾
1°C 2.1°C 1.8°C - 100% 0.04kPa
21:00 ☾
1.1°C 2°C 1.5°C - 100% 0.02kPa
22:00 ☾
1.1°C 1.8°C 1.4°C - 100% 0.02kPa
23:00 ☾
1°C 1.7°C 1.3°C - 100% 0.02kPa
Tue, Mar 17 Sunrise 06:39 Sunset 18:28
24:00 ☾
0.5°C 1.6°C 0.92°C - 100% 0.02kPa
01:00 ☾
0.2°C 1.4°C 1.1°C - 100% 0.04kPa
02:00 ☾
0.4°C 1.3°C 1.1°C - 100% 0.03kPa
03:00 ☾
0.5°C 1.2°C 0.97°C - 100% 0.02kPa
04:00 ☾
0.5°C 1.1°C 0.93°C - 100% 0.02kPa
05:00 ☾
0.5°C 1.1°C 0.95°C - 100% 0.02kPa
06:00 ☾
0.4°C 0.97°C 0.99°C - 100% 0.03kPa
07:00
0.1°C 0.9°C 0.84°C - 100% 0.03kPa
08:00
0.2°C 0.9°C 1.3°C - 99% 0.05kPa
09:00
0.4°C 1.1°C 1.6°C - 100% 0.05kPa
10:00
1.1°C 1.3°C 1.8°C - 100% 0.04kPa
11:00
1.1°C 1.3°C 1.6°C - 100% 0.03kPa
12:00
1.3°C 1.3°C 1.8°C - 100% 0.03kPa
13:00
0.5°C 1.5°C 1.7°C - 100% 0.06kPa
14:00
-0.5°C 1.6°C 2.6°C - 98% 0.15kPa
15:00
-0.7°C 2°C 3.9°C - 29% 0.22kPa
16:00
-0.5°C 2.4°C 4.3°C - 12% 0.24kPa
17:00
-0.1°C 2.5°C 3.6°C - 13% 0.19kPa
18:00
-0.4°C 2.4°C 2.5°C - 5% 0.14kPa
19:00 ☾
-1°C 2°C 1.4°C - 5% 0.11kPa
20:00 ☾
-1.2°C 1.6°C 0.78°C - 5% 0.09kPa
21:00 ☾
-1.1°C 1.4°C 0.46°C - 37% 0.07kPa
22:00 ☾
-1.1°C 1.2°C 0.15°C - 68% 0.05kPa
23:00 ☾
-1°C 0.99°C -0.17°C - 100% 0.04kPa
Wed, Mar 18 Sunrise 06:36 Sunset 18:30
24:00 ☾
-1°C 0.81°C 0.22°C - 100% 0.05kPa
01:00 ☾
-0.9°C 0.63°C 0.61°C - 100% 0.07kPa
02:00 ☾
-0.9°C 0.46°C 1°C - 100% 0.09kPa
03:00 ☾
-0.2°C 0.45°C 2.1°C - 100% 0.11kPa
04:00 ☾
0.4°C 0.45°C 3.3°C - 100% 0.14kPa
05:00 ☾
1°C 0.45°C 4.4°C - 100% 0.18kPa
06:00 ☾
1.5°C 0.59°C 4.5°C - 100% 0.16kPa
07:00
2°C 0.72°C 4.5°C - 100% 0.13kPa
08:00
2.5°C 0.86°C 4.5°C - 100% 0.11kPa
09:00
2.5°C 1.2°C 4.3°C - 100% 0.1kPa
10:00
2.5°C 1.5°C 4.1°C - 100% 0.09kPa
11:00
2.5°C 1.8°C 3.9°C - 100% 0.08kPa
12:00
2.6°C 2°C 3.9°C - 100% 0.07kPa
13:00
2.7°C 2.1°C 3.9°C - 100% 0.07kPa
14:00
2.7°C 2.2°C 3.9°C - 100% 0.06kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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