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Rule Morning Frost

Björkliden - Morning Frost - Swedish Lapland

Björkliden, Norrbotten, Sweden

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature-0.9°C
Dew Point-2.2°C (low dew point)
Wind Speed4.7m/s (calm conditions)
Cloud Cover5%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Stockholm
Next opportunity
Light Frost at Sunrise
Björkliden
Sun, Apr 12 · 04:28–05:00 · 1h window
Low confidence
38%
❄️Frost Probability68%
Soil Temperature: -1.6°C
Dew Point: -2.1°C (low dew point)
Wind Speed: 1.5m/s (calm conditions)
Cloud Cover: 61%
thermometer-snow weather icon
Light Frost at Sunrise
Björkliden
Thu, Apr 16 · 04:13–06:28
❄️Frost Probability:61-69%
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
1matching hours in the next 95 hoursJump to next match
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
Wed, Apr 8
09:0058%2.1m/s
10:0055%2.5m/s
11:0054%2.6m/s
12:0054%2.6m/s
13:0054%2.6m/s
14:0055%2.5m/s
15:0069%2.4m/s
16:0058%2.4m/s
17:0058%2.3m/s
18:0054%2.3m/s
19:0050%1.8m/s
20:0052%1.7m/s
21:0054%2.4m/s
22:0054%1.9m/s
23:0054%2.3m/s
Thu, Apr 9
24:0054%2.7m/s
01:0052%3.1m/s
02:0052%3m/s
03:0052%3.3m/s
04:0052%3.5m/s
05:0052%3.8m/s
06:0052%4m/s
07:0053%4.1m/s
08:0054%4.2m/s
09:0068%4.3m/s
10:0065%4.7m/s
11:0065%4.8m/s
12:0065%5.1m/s
13:0065%5m/s
14:0050%5.1m/s
15:0065%5.1m/s
16:0068%5.2m/s
17:0068%5.1m/s
18:0065%5m/s
19:0065%4.9m/s
20:0065%4.7m/s
21:0061%4.8m/s
22:0061%5m/s
23:0068%4.9m/s
Fri, Apr 10
24:0076%4.7m/s
01:0076%4.8m/s
02:0076%4.9m/s
03:0076%4.8m/s
04:0076%4.7m/s
05:0076%4.6m/s
06:0076%4.5m/s
07:0076%4.6m/s
08:0076%4.5m/s
09:0076%4.7m/s
10:0068%4.7m/s
11:0068%4.8m/s
12:0076%4.9m/s
13:0072%4.9m/s
14:0060%4.6m/s
15:0068%4.4m/s
16:0068%4.3m/s
17:0076%4.3m/s
18:0078%4m/s
19:0070%3.6m/s
20:0067%2.9m/s
21:0067%3.2m/s
22:0067%3.7m/s
23:0067%3.4m/s
Sat, Apr 11
24:0067%2.9m/s
01:0069%2.6m/s
02:0051%2.1m/s
03:0050%2.1m/s
04:0050%2m/s
05:0050%2m/s
06:0051%1.8m/s
07:0054%1.7m/s
08:0054%2.1m/s
09:0054%2.1m/s
10:0054%2.3m/s
11:0054%2.4m/s
12:0061%2.5m/s
13:0068%2.5m/s
14:0068%2.3m/s
15:0065%1.7m/s
16:0059%1.1m/s
17:0061%0.53m/s
18:0061%0.58m/s
19:0061%0.63m/s
20:0058%0.68m/s
21:0058%0.77m/s
22:0056%0.86m/s
23:0056%0.95m/s
Sun, Apr 12
24:0060%0.93m/s
01:0060%0.91m/s
02:0071%0.9m/s
03:0071%1.2m/s
04:0068%1.5m/s
05:0071%1.8m/s
06:0071%1.8m/s
07:0071%1.9m/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
Thu, Apr 9 Sunrise 05:24 Sunset 19:57
10:00
-2.2°C -0.85°C 0.2°C - 5% 0.1kPa
11:00
-1.2°C -0.85°C 0.7°C - 5% 0.08kPa
12:00
-0.5°C -0.85°C 1.1°C - 5% 0.07kPa
13:00
-0.1°C -0.85°C 1.3°C - 9% 0.07kPa
14:00
0°C -0.85°C 1.6°C - 84% 0.08kPa
15:00
-0.1°C -0.81°C 1.9°C - 5% 0.1kPa
16:00
-0.6°C -0.83°C 2°C - 5% 0.12kPa
17:00
-1.3°C -0.83°C 1.8°C - 39% 0.14kPa
18:00
-2.3°C -0.83°C 1.4°C - 55% 0.16kPa
19:00
-3.8°C -0.83°C 0.54°C - 52% 0.17kPa
20:00
-5.2°C -0.83°C -0.97°C - 51% 0.15kPa
21:00
-6.1°C -0.82°C -1.7°C - 82% 0.15kPa
22:00
-6.9°C -0.82°C -2.4°C - 81% 0.15kPa
23:00
-7.7°C -0.82°C -3°C - 36% 0.15kPa
Fri, Apr 10 Sunrise 05:24 Sunset 19:57
24:00
-8.1°C -0.82°C -3.4°C - 5% 0.14kPa
01:00
-8.4°C -0.84°C -3.7°C - 5% 0.14kPa
02:00
-8.3°C -0.87°C -3.6°C - 5% 0.14kPa
03:00
-8.2°C -0.9°C -3.6°C - 5% 0.14kPa
04:00
-8°C -0.94°C -3.8°C - 5% 0.13kPa
05:00
-7.7°C -0.98°C -3.7°C - 5% 0.12kPa
06:00
-7.2°C -1°C -3.5°C - 5% 0.12kPa
07:00
-6.1°C -1.1°C -2.5°C - 5% 0.12kPa
08:00
-4.4°C -1.1°C -1.1°C - 5% 0.12kPa
09:00
-3°C -1.1°C 0.16°C - 4% 0.13kPa
10:00
-2°C -1.1°C 0.91°C - 3% 0.12kPa
11:00
-1.8°C -1.1°C 1.2°C - 2% 0.13kPa
12:00
-2°C -1.1°C 1.3°C - 3% 0.14kPa
13:00
-1.7°C -1.1°C 1.5°C - 22% 0.14kPa
14:00
-1.2°C -1.1°C 1.7°C - 38% 0.13kPa
15:00
-0.8°C -1°C 2°C - 5% 0.13kPa
16:00
-1°C -1°C 2.1°C - 29% 0.14kPa
17:00
-1.4°C -0.95°C 2°C - 5% 0.15kPa
18:00
-1.9°C -0.95°C 1.4°C - 5% 0.14kPa
19:00
-2.2°C -0.95°C 0.48°C - 5% 0.11kPa
20:00
-3.1°C -0.95°C -1.4°C - 5% 0.07kPa
21:00
-3.8°C -0.89°C -2.2°C - 5% 0.06kPa
22:00
-4.2°C -0.89°C -2.3°C - 5% 0.07kPa
23:00
-4.7°C -0.89°C -2.9°C - 5% 0.06kPa
Sat, Apr 11 Sunrise 05:20 Sunset 20:00
24:00
-5.4°C -0.91°C -4°C - 5% 0.05kPa
01:00
-6.1°C -0.94°C -4.9°C - 5% 0.04kPa
02:00
-6.6°C -0.99°C -5.7°C - 68% 0.03kPa
03:00
-6.8°C -1°C -5.9°C - 100% 0.03kPa
04:00
-6.7°C -1.2°C -5.9°C - 100% 0.02kPa
05:00
-6.6°C -1.3°C -5.7°C - 100% 0.03kPa
06:00
-6.2°C -1.4°C -5.2°C - 74% 0.03kPa
07:00
-5°C -1.5°C -3.7°C - 97% 0.04kPa
08:00
-3.7°C -1.5°C -1.4°C - 96% 0.08kPa
09:00
-2.5°C -1.5°C 0.05°C - 100% 0.1kPa
10:00
-1.1°C -1.5°C 0.98°C - 99% 0.09kPa
11:00
-0.1°C -1.5°C 1.7°C - 85% 0.08kPa
12:00
0.4°C -1.4°C 2.2°C - 35% 0.09kPa
13:00
0.7°C -1.4°C 2.8°C - 17% 0.11kPa
14:00
0.8°C -1.2°C 3.2°C - 19% 0.12kPa
15:00
-0.5°C -1.1°C 1.1°C - 24% 0.07kPa
16:00
-1.9°C -0.93°C -1°C - 28% 0.04kPa
17:00
-3.4°C -0.78°C -3.1°C - 33% 0.01kPa
18:00
-3.8°C -0.84°C -3.5°C - 35% 0.01kPa
19:00
-4.2°C -0.89°C -3.8°C - 38% 0.01kPa
20:00
-4.6°C -0.94°C -4.2°C - 41% 0.01kPa
21:00
-5°C -1.1°C -4.6°C - 46% 0.01kPa
22:00
-5.4°C -1.2°C -5°C - 52% 0.02kPa
23:00
-5.9°C -1.4°C -5.3°C - 57% 0.02kPa
Sun, Apr 12 Sunrise 05:17 Sunset 20:03
24:00
-5°C -1.5°C -3.5°C - 55% 0.05kPa
01:00
-4.1°C -1.6°C -1.6°C - 53% 0.09kPa
02:00
-3.4°C -1.7°C 0.32°C - 50% 0.15kPa
03:00
-2.8°C -1.7°C 1.2°C - 56% 0.17kPa
04:00
-2.1°C -1.6°C 2.1°C - 61% 0.19kPa
05:00
-1.4°C -1.6°C 3°C - 67% 0.21kPa
06:00
-1°C -1.5°C 3.6°C - 64% 0.22kPa
07:00
-0.5°C -1.3°C 4.2°C - 61% 0.24kPa
08:00
-0.1°C -1.2°C 4.8°C - 58% 0.25kPa
09:00
0.2°C -1.1°C 4.6°C - 43% 0.23kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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