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Rule Morning Frost

Gällivare - Morning Frost - Swedish Lapland

Gällivare, Norrbotten, Sweden

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature-6.6°C
Dew Point-18.7°C (low dew point)
Wind Speed2.3m/s (calm conditions)
Cloud Cover13%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Stockholm
Next opportunity
Moderate Frost (radiative) at Sunrise
Gällivare
Mon, Mar 2 · 06:05–08:20 · 2h window
Low confidence
20%
❄️Frost Probability69-73%
Soil Temperature: -5.1°C
Dew Point: -5.8°C (low dew point)
Wind Speed: 1.2m/s (calm conditions)
Cloud Cover: 5%
thermometer-snow weather icon
Light Frost (radiative) at Sunrise
Gällivare
Tue, Mar 3 · 06:01–08:16
❄️Frost Probability:65-69%
Low

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the extreme arctic frost conditions that transform Swedish Lapland into a frozen wonderland. We combine temperature, humidity, wind, and snow data to predict optimal conditions for photographing the region's spectacular frost phenomena.

Swedish Lapland experiences frost conditions as extreme as neighboring Finland, with temperatures regularly dropping below -25°C from December through February. The region's vast frozen lakes, frost-covered birch forests, and ice formations create otherworldly winter landscapes. The famous Abisko microclimate means frost conditions often coincide with clear skies—ideal for photography.

What makes Swedish Lapland special for frost photography:

  • Frozen Torneträsk - Sweden's sixth largest lake freezes solid, creating vast ice plains
  • Abisko clarity - The Blue Hole microclimate provides clear skies for photographing frost
  • Birch forest frost - Frost-covered mountain birch create delicate white forests
  • Ice architecture - The ICEHOTEL and frozen Torne River offer unique frost subjects

Lake Torneträsk freezes completely by midwinter, creating an otherworldly frozen seascape stretching to the horizon. The pressure ridges and ice formations along the shore provide dramatic foreground elements. The mountain birch forests around Abisko become ethereal frost galleries—each delicate branch outlined in white against blue arctic twilight. The Torne River near Jukkasjärvi provides ice harvesting opportunities to photograph—massive blocks cut for the ICEHOTEL construction. At Abisko, the microclimate advantage means you can photograph frost phenomena under clear skies more reliably than elsewhere in Lapland. The combination of extreme cold and the region's unique light makes for spectacular blue hour frost photography.

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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/Stockholm
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Sat, Feb 21
20:0067%2.4m/s
21:0067%2.2m/s
22:0067%2m/s
23:0067%2m/s
Sun, Feb 22
24:0067%2.1m/s
01:0067%2.1m/s
02:0067%2.2m/s
03:0067%2.3m/s
04:0067%2.3m/s
05:0067%2.3m/s
06:0067%2.4m/s
07:0067%2.4m/s
08:0059%2.4m/s
09:0071%2.3m/s
10:0071%2m/s
11:0071%1.9m/s
12:0071%1.8m/s
13:0071%1.8m/s
14:0073%1.7m/s
15:0067%1.7m/s
16:0067%2m/s
17:0067%2m/s
18:0067%2.1m/s
19:0067%2.1m/s
20:0063%2.3m/s
21:0067%2.2m/s
22:0067%2.1m/s
23:0067%2.1m/s
Mon, Feb 23
24:0067%2m/s
01:0067%2m/s
02:0067%1.9m/s
03:0067%1.9m/s
04:0067%2m/s
05:0067%1.9m/s
06:0067%1.8m/s
07:0067%1.7m/s
08:0067%1.8m/s
09:0069%1.5m/s
10:0073%0.84m/s
11:0075%0.44m/s
12:0075%0.38m/s
13:0075%0.35m/s
14:0071%0.39m/s
15:0071%0.43m/s
16:0065%0.9m/s
17:0058%1.5m/s
18:0053%1.7m/s
19:0056%1.9m/s
20:0056%1.9m/s
21:0053%1.9m/s
22:0059%2m/s
23:0059%2m/s
Tue, Feb 24
24:0059%2m/s
01:0063%2.1m/s
02:0063%2.1m/s
03:0063%2m/s
04:0063%2.2m/s
05:0067%2.1m/s
06:0067%2.1m/s
07:0067%2.2m/s
08:0067%2.2m/s
09:0071%2m/s
10:0071%1.7m/s
11:0073%1.6m/s
12:0073%1.5m/s
13:0073%1.3m/s
14:0073%1.2m/s
15:0073%1.4m/s
16:0073%1.6m/s
17:0071%1.7m/s
18:0071%1.8m/s
19:0071%1.9m/s
20:0071%1.8m/s
21:0071%1.8m/s
22:0071%1.9m/s
23:0071%1.8m/s
Wed, Feb 25
24:0071%1.8m/s
01:0071%1.8m/s
02:0063%1.7m/s
03:0059%1.6m/s
04:0058%1.6m/s
05:0056%1.9m/s
06:0056%2.3m/s
07:0056%2.6m/s
08:0054%3.2m/s
09:0050%3.8m/s
10:0048%4.3m/s
11:0048%4.6m/s
12:0048%4.9m/s
13:0048%5.2m/s
14:0048%5m/s
15:0048%4.8m/s
16:0048%4.6m/s
17:0050%4.2m/s
18:0050%3.8m/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/Stockholm
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sun, Feb 22 Sunrise 07:22 Sunset 16:20
20:00
-19°C -6.6°C -18°C - 13% 0.01kPa
21:00
-19°C -6.6°C -18°C - 5% 0.01kPa
22:00
-19°C -6.6°C -19°C - 5% 0.01kPa
23:00
-20°C -6.6°C -19°C - 5% 0.01kPa
Mon, Feb 23 Sunrise 07:22 Sunset 16:20
24:00
-20°C -6.6°C -20°C - 5% 0.01kPa
01:00
-20°C -6.6°C -20°C - 5% 0.01kPa
02:00
-20°C -6.6°C -20°C - 5% 0.01kPa
03:00
-20°C -6.6°C -20°C - 5% 0.01kPa
04:00
-20°C -6.6°C -20°C - 5% 0.01kPa
05:00
-20°C -6.6°C -20°C - 5% 0.01kPa
06:00
-21°C -6.6°C -20°C - 5% 0.01kPa
07:00
-21°C -6.6°C -20°C - 5% 0.01kPa
08:00
-21°C -6.6°C -20°C - 5% 0.01kPa
09:00
-18°C -6.6°C -17°C - 5% 0.01kPa
10:00
-15°C -6.6°C -13°C - 5% 0.03kPa
11:00
-13°C -6.6°C -11°C - 5% 0.03kPa
12:00
-12°C -6.6°C -10°C - 5% 0.03kPa
13:00
-11°C -6.6°C -10°C - 5% 0.03kPa
14:00
-11°C -6.6°C -11°C - 5% 0.01kPa
15:00
-13°C -6.5°C -13°C - 5% 0.01kPa
16:00
-17°C -6.5°C -17°C - 24% 0kPa
17:00
-19°C -6.5°C -19°C - 56% 0kPa
18:00
-20°C -6.5°C -20°C - 60% 0kPa
19:00
-21°C -6.5°C -21°C - 43% 0kPa
20:00
-22°C -6.5°C -22°C - 46% 0kPa
21:00
-22°C -6.6°C -22°C - 65% 0kPa
22:00
-22°C -6.6°C -22°C - 36% 0kPa
23:00
-22°C -6.6°C -22°C - 33% 0kPa
Tue, Feb 24 Sunrise 07:18 Sunset 16:24
24:00
-22°C -6.6°C -22°C - 25% 0kPa
01:00
-22°C -6.6°C -22°C - 23% 0kPa
02:00
-22°C -6.6°C -22°C - 21% 0kPa
03:00
-23°C -6.6°C -22°C - 15% 0kPa
04:00
-22°C -6.7°C -22°C - 13% 0kPa
05:00
-22°C -6.7°C -22°C - 5% 0kPa
06:00
-22°C -6.7°C -22°C - 5% 0kPa
07:00
-22°C -6.7°C -22°C - 5% 0kPa
08:00
-21°C -6.7°C -21°C - 5% 0kPa
09:00
-18°C -6.7°C -17°C - 5% 0.01kPa
10:00
-14°C -6.7°C -13°C - 5% 0.03kPa
11:00
-13°C -6.7°C -11°C - 5% 0.04kPa
12:00
-12°C -6.7°C -9.3°C - 5% 0.05kPa
13:00
-11°C -6.6°C -8.8°C - 4% 0.05kPa
14:00
-11°C -6.6°C -9.8°C - 5% 0.03kPa
15:00
-13°C -6.6°C -12°C - 5% 0.02kPa
16:00
-17°C -6.6°C -16°C - 5% 0.02kPa
17:00
-20°C -6.6°C -19°C - 4% 0.01kPa
18:00
-21°C -6.6°C -20°C - 3% 0.01kPa
19:00
-22°C -6.6°C -21°C - 5% 0.01kPa
20:00
-23°C -6.6°C -21°C - 4% 0.02kPa
21:00
-23°C -6.6°C -21°C - 2% 0.02kPa
22:00
-23°C -6.6°C -21°C - 2% 0.02kPa
23:00
-23°C -6.6°C -21°C - 2% 0.02kPa
Wed, Feb 25 Sunrise 07:14 Sunset 16:28
24:00
-23°C -6.6°C -21°C - 2% 0.02kPa
01:00
-24°C -6.7°C -22°C - 2% 0.01kPa
02:00
-21°C -7.1°C -20°C - 35% 0.02kPa
03:00
-19°C -7.5°C -18°C - 67% 0.02kPa
04:00
-17°C -8°C -15°C - 100% 0.03kPa
05:00
-16°C -8°C -15°C - 100% 0.03kPa
06:00
-15°C -7.9°C -14°C - 100% 0.03kPa
07:00
-14°C -7.9°C -13°C - 100% 0.03kPa
08:00
-14°C -7.9°C -12°C - 100% 0.02kPa
09:00
-13°C -7.9°C -12°C - 100% 0.02kPa
10:00
-13°C -7.9°C -12°C - 100% 0.01kPa
11:00
-12°C -7.8°C -12°C - 100% 0.01kPa
12:00
-12°C -7.8°C -11°C - 100% 0.01kPa
13:00
-11°C -7.8°C -10°C - 100% 0.02kPa
14:00
-11°C -7.8°C -10°C - 100% 0.02kPa
15:00
-11°C -7.7°C -10°C - 100% 0.02kPa
16:00
-11°C -7.7°C -10°C - 100% 0.02kPa
17:00
-11°C -7.7°C -10°C - 100% 0.02kPa
18:00
-11°C -7.7°C -9.9°C - 100% 0.02kPa
19:00
-10°C -7.6°C -9.8°C - 100% 0.01kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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