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Rule Morning Frost

Vesijärvi - Morning Frost - Southern Finland

Lahti, Päijänne Tavastia, 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 Temperature13.8°C
Dew Point8.0°C (moderate dew point)
Wind Speed5.7m/s (moderate winds)
Cloud Cover89%

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 79 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, May 24
08:00✕0%4.8m/s
09:00✕0%5.4m/s
10:00✕0%5.9m/s
11:00✕0%6.5m/s
12:00✕0%6.7m/s
13:00✕0%6.4m/s
14:00✕0%5.9m/s
15:00✕0%6.4m/s
16:00✕0%5.7m/s
17:00✕0%5.5m/s
18:00✕0%5.8m/s
19:00✕0%5.8m/s
20:00✕0%5.7m/s
21:00✕0%5.6m/s
22:00✕0%5.7m/s
23:00✕0%5.5m/s
Mon, May 25
24:00✕0%5.2m/s
01:00✕0%5.3m/s
02:00✕0%5.4m/s
03:00✓0%4.8m/s
04:00✓0%5.3m/s
05:00✓0%4.5m/s
06:00✕0%5m/s
07:00✕0%5.1m/s
08:00✕0%5.2m/s
09:00✕0%5.8m/s
10:00✕0%5.9m/s
11:00✕0%6.1m/s
12:00✕0%6.5m/s
13:00✕0%6.7m/s
14:00✕0%7.2m/s
15:00✕0%7.1m/s
16:00✕0%6.6m/s
17:00✕0%6.1m/s
18:00✕0%5.8m/s
19:00✕0%5.5m/s
20:00✕0%5m/s
21:00✕0%6m/s
22:00✕0%5.7m/s
23:00✕0%5.2m/s
Tue, May 26
24:00✕0%4.9m/s
01:00✕0%5m/s
02:00✕0%4.8m/s
03:00✓0%4.1m/s
04:00✓0%3.6m/s
05:00✓0%3.4m/s
06:00✕0%3.3m/s
07:00✕0%3.9m/s
08:00✕0%4m/s
09:00✕0%4.1m/s
10:00✕0%4.7m/s
11:00✕0%5.2m/s
12:00✕0%5.2m/s
13:00✕0%5m/s
14:00✕0%4.2m/s
15:00✕0%5.2m/s
16:00✕0%4.3m/s
17:00✕0%4.6m/s
18:00✕0%3.9m/s
19:00✕0%3.9m/s
20:00✕0%3.5m/s
21:00✕0%4m/s
22:00✕0%3.8m/s
23:00✕0%3.7m/s
Wed, May 27
24:00✕0%3.5m/s
01:00✕0%3.9m/s
02:00✕0%4.3m/s
03:00✓0%4.7m/s
04:00✓0%5m/s
05:00✓0%5.4m/s
06:00✕0%5.7m/s
07:00✕0%5.8m/s
08:00✕0%5.9m/s
09:00✕0%6m/s
10:00✕0%5.9m/s
11:00✕0%5.8m/s
12:00✕0%5.6m/s
13:00✕0%5.7m/s
14:00✕0%5.7m/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, May 24 Sunrise 04:12 Sunset 22:17
16:00
8°C 14°C 17°C - 89% 0.86kPa
17:00
8.1°C 14°C 16°C - 43% 0.77kPa
18:00
8.3°C 14°C 17°C - 25% 0.88kPa
19:00
8°C 14°C 16°C - 6% 0.79kPa
20:00
7.8°C 14°C 15°C - 5% 0.69kPa
21:00
7.6°C 14°C 14°C - 5% 0.6kPa
22:00
7.3°C 14°C 13°C - 6% 0.5kPa
23:00 ☾
7.1°C 14°C 12°C - 1% 0.42kPa
Mon, May 25 Sunrise 04:12 Sunset 22:17
24:00 ☾
6.9°C 13°C 12°C - 48% 0.36kPa
01:00 ☾
6.3°C 13°C 11°C - 100% 0.37kPa
02:00 ☾
6°C 13°C 11°C - 97% 0.36kPa
03:00 ☾
5°C 13°C 11°C - 100% 0.42kPa
04:00 ☾
3.9°C 12°C 11°C - 99% 0.51kPa
05:00
4.1°C 12°C 10°C - 100% 0.41kPa
06:00
4.5°C 12°C 10°C - 100% 0.39kPa
07:00
4.1°C 12°C 10°C - 68% 0.42kPa
08:00
3.6°C 12°C 11°C - 56% 0.49kPa
09:00
2.2°C 12°C 11°C - 94% 0.61kPa
10:00
1.8°C 12°C 12°C - 40% 0.7kPa
11:00
1.3°C 12°C 13°C - 93% 0.85kPa
12:00
0.7°C 12°C 14°C - 7% 0.99kPa
13:00
0.1°C 12°C 15°C - 5% 1.1kPa
14:00
-0.2°C 12°C 15°C - 5% 1.1kPa
15:00
-0.4°C 13°C 16°C - 5% 1.2kPa
16:00
0.3°C 13°C 15°C - 5% 1.1kPa
17:00
0.3°C 13°C 15°C - 5% 1.1kPa
18:00
1.1°C 13°C 16°C - 5% 1.1kPa
19:00
1°C 13°C 15°C - 5% 1kPa
20:00
1°C 13°C 14°C - 5% 0.93kPa
21:00
1.7°C 13°C 13°C - 5% 0.77kPa
22:00
1.4°C 13°C 11°C - 2% 0.67kPa
23:00 ☾
1.7°C 13°C 11°C - 0% 0.58kPa
Tue, May 26 Sunrise 04:10 Sunset 22:20
24:00 ☾
2°C 12°C 9.7°C - 0% 0.5kPa
01:00 ☾
2.3°C 12°C 8.9°C - 0% 0.42kPa
02:00 ☾
2.8°C 12°C 8.2°C - 0% 0.34kPa
03:00 ☾
3°C 11°C 7.6°C - 0% 0.29kPa
04:00 ☾
2.9°C 11°C 6.9°C - 4% 0.24kPa
05:00
3.1°C 11°C 6.5°C - 5% 0.21kPa
06:00
3.4°C 10°C 7.2°C - 3% 0.24kPa
07:00
3.4°C 10°C 8.6°C - 0% 0.34kPa
08:00
3°C 10°C 10°C - 3% 0.49kPa
09:00
2.6°C 10°C 12°C - 5% 0.68kPa
10:00
1.2°C 10°C 14°C - 5% 0.9kPa
11:00
0.9°C 11°C 15°C - 53% 1kPa
12:00
1.2°C 11°C 15°C - 100% 1.1kPa
13:00
2.6°C 11°C 14°C - 100% 0.89kPa
14:00
3.7°C 11°C 13°C - 88% 0.67kPa
15:00
3°C 12°C 15°C - 99% 0.95kPa
16:00
3.4°C 12°C 14°C - 74% 0.85kPa
17:00
3.4°C 12°C 15°C - 100% 0.87kPa
18:00
3.3°C 12°C 14°C - 93% 0.83kPa
19:00
3.6°C 12°C 14°C - 88% 0.79kPa
20:00
3.6°C 12°C 13°C - 6% 0.73kPa
21:00
3.9°C 12°C 12°C - 75% 0.55kPa
22:00
4.9°C 11°C 9.9°C - 64% 0.35kPa
23:00 ☾
5.5°C 10°C 8.3°C - 54% 0.19kPa
Wed, May 27 Sunrise 04:08 Sunset 22:22
24:00 ☾
5.8°C 9.6°C 6.6°C - 43% 0.06kPa
01:00 ☾
4.9°C 9.5°C 7.5°C - 59% 0.17kPa
02:00 ☾
3.8°C 9.4°C 8.3°C - 75% 0.29kPa
03:00 ☾
2.4°C 9.3°C 9.2°C - 91% 0.43kPa
04:00 ☾
1.4°C 9.4°C 9.9°C - 94% 0.54kPa
05:00
0.3°C 9.5°C 11°C - 97% 0.66kPa
06:00
-1.2°C 9.6°C 11°C - 100% 0.78kPa
07:00
-1.6°C 9.8°C 12°C - 100% 0.87kPa
08:00
-2.2°C 10°C 13°C - 100% 0.96kPa
09:00
-2.8°C 10°C 14°C - 100% 1.1kPa
10:00
-2.4°C 10°C 14°C - 94% 1kPa
11:00
-2°C 11°C 14°C - 87% 1kPa
12:00
-1.6°C 11°C 14°C - 81% 1kPa
13:00
-1.9°C 11°C 13°C - 78% 0.92kPa
14:00
-2.2°C 11°C 11°C - 74% 0.83kPa
15:00
-2.5°C 11°C 10°C - 70% 0.75kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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