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Rule Morning Frost

Torneträsk - Morning Frost - Swedish Lapland

Abisko, Norrbotten, Sweden

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Soil Temperature-4.4°C
Dew Point-10.4°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/Stockholm
Next opportunity
Light Frost at Sunrise
Torneträsk
Fri, Apr 17 · 03:58–04:00 · 1h window
Low confidence
37%
❄️Frost Probability60%
Soil Temperature: -3.4°C
Dew Point: -3.6°C (low dew point)
Wind Speed: 0.6m/s (calm conditions)
Cloud Cover: 91%

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 92 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
Wed, Apr 8
06:0053%5m/s
07:0056%5.2m/s
08:0052%5m/s
09:0059%4.8m/s
10:0052%5.1m/s
11:0052%5m/s
12:0053%5.4m/s
13:0052%4.8m/s
14:0052%4.2m/s
15:0054%3.9m/s
16:0054%3.7m/s
17:0054%3.5m/s
18:0054%3.4m/s
19:0054%3.3m/s
20:0054%3.2m/s
21:0056%2.5m/s
22:0067%2.3m/s
23:0067%2.5m/s
Thu, Apr 9
24:0067%2.7m/s
01:0080%3m/s
02:0069%3.6m/s
03:0069%3.1m/s
04:0080%3.2m/s
05:0066%3.1m/s
06:0065%3.1m/s
07:0067%2.8m/s
08:0067%2.3m/s
09:0073%1.5m/s
10:0069%0.99m/s
11:0063%0.63m/s
12:0057%0.44m/s
13:0056%0.31m/s
14:0056%0.6m/s
15:0054%1m/s
16:0054%1.1m/s
17:0053%1.8m/s
18:0056%2.1m/s
19:0063%2.5m/s
20:0069%3m/s
21:0065%3.4m/s
22:0061%3.4m/s
23:0061%3.4m/s
Fri, Apr 10
24:0061%3.4m/s
01:0061%3.3m/s
02:0057%3m/s
03:0063%2.7m/s
04:0052%2.6m/s
05:0052%2.7m/s
06:0056%2.5m/s
07:0057%2.1m/s
08:0060%1.8m/s
09:0058%1.3m/s
10:0054%1.3m/s
11:0054%0.92m/s
12:0056%0.66m/s
13:0054%0.82m/s
14:0054%1.3m/s
15:0054%1.3m/s
16:0054%1.1m/s
17:0054%0.94m/s
18:0055%0.92m/s
19:0055%0.94m/s
20:0055%0.94m/s
21:0054%1.2m/s
22:0062%1.3m/s
23:0069%1.5m/s
Sat, Apr 11
24:0067%2m/s
01:0071%2.2m/s
02:0071%2.5m/s
03:0071%2.5m/s
04:0064%2.6m/s
05:0065%2.5m/s
06:0068%2.3m/s
07:0067%2.2m/s
08:0067%1.7m/s
09:0057%1.9m/s
10:0057%2m/s
11:0053%2.1m/s
12:0053%2.2m/s
13:0053%2.2m/s
14:0053%2.3m/s
15:0056%2.3m/s
16:0056%2.4m/s
17:0056%2.5m/s
18:0056%2.7m/s
19:0051%2.9m/s
20:0051%3.1m/s
21:0051%3.3m/s
22:0050%3.4m/s
23:0050%3.6m/s
Sun, Apr 12
24:0050%3.6m/s
01:0051%3.7m/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/Stockholm
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Thu, Apr 9 Sunrise 05:19 Sunset 20:16
04:00
-10°C -4.4°C -6°C - 5% 0.11kPa
05:00
-10°C -4.4°C -5.6°C - 76% 0.12kPa
06:00
-9.5°C -4.4°C -5°C - 100% 0.13kPa
07:00
-7.7°C -4.4°C -3.8°C - 100% 0.12kPa
08:00
-5.5°C -4.4°C -2.1°C - 100% 0.12kPa
09:00
-3.1°C -4.4°C 0.23°C - 57% 0.13kPa
10:00
-0.3°C -4.4°C 0.84°C - 24% 0.05kPa
11:00
0.7°C -4.3°C 0.85°C - 26% 0.01kPa
12:00
0.9°C -4.3°C 0.89°C - 63% 0kPa
13:00
0.8°C -4.1°C 0.84°C - 89% 0kPa
14:00
0.4°C -4.1°C 0.36°C - 90% 0kPa
15:00
-0.1°C -4°C -0.11°C - 92% 0kPa
16:00
0°C -3.9°C -0.05°C - 86% 0kPa
17:00
-0.1°C -3.9°C -0.03°C - 69% 0kPa
18:00
-0.5°C -3.8°C -0.09°C - 41% 0.02kPa
19:00
-3.4°C -3.7°C -2.5°C - 11% 0.03kPa
20:00
-6°C -3.7°C -5°C - 8% 0.03kPa
21:00
-6.9°C -3.8°C -5.9°C - 9% 0.03kPa
22:00
-7°C -3.8°C -6.3°C - 15% 0.02kPa
23:00
-7°C -3.8°C -6.5°C - 25% 0.01kPa
Fri, Apr 10 Sunrise 05:19 Sunset 20:16
24:00
-7°C -3.8°C -6.5°C - 15% 0.01kPa
01:00
-7.1°C -3.8°C -6.5°C - 11% 0.02kPa
02:00
-7.3°C -3.8°C -6.8°C - 26% 0.01kPa
03:00
-7.3°C -3.8°C -6.8°C - 23% 0.01kPa
04:00
-7.5°C -3.8°C -6.9°C - 100% 0.02kPa
05:00
-6.7°C -3.8°C -5.9°C - 100% 0.02kPa
06:00
-5.4°C -3.8°C -4.3°C - 100% 0.04kPa
07:00
-4.5°C -3.8°C -3.2°C - 68% 0.04kPa
08:00
-3.5°C -3.8°C -2.2°C - 57% 0.05kPa
09:00
-1.9°C -3.7°C -0.26°C - 98% 0.07kPa
10:00
0.1°C -3.6°C 0.34°C - 100% 0.01kPa
11:00
0.5°C -3.5°C 0.48°C - 100% 0kPa
12:00
0.8°C -3.4°C 0.82°C - 100% 0kPa
13:00
0.7°C -3.3°C 0.74°C - 100% 0kPa
14:00
0.6°C -3.3°C 0.57°C - 100% 0kPa
15:00
0.1°C -3.2°C 0.15°C - 100% 0kPa
16:00
0°C -3.1°C 0.01°C - 100% 0kPa
17:00
-0.1°C -3°C -0.09°C - 91% 0kPa
18:00
0.1°C -2.9°C 0.11°C - 77% 0kPa
19:00
-0.9°C -2.8°C -0.34°C - 76% 0.02kPa
20:00
-2.2°C -2.7°C -1.4°C - 75% 0.03kPa
21:00
-3.3°C -2.7°C -2.4°C - 100% 0.03kPa
22:00
-3.8°C -2.7°C -2.8°C - 55% 0.04kPa
23:00
-6.1°C -2.7°C -5°C - 20% 0.03kPa
Sat, Apr 11 Sunrise 05:14 Sunset 20:19
24:00
-7.5°C -2.7°C -6.1°C - 12% 0.04kPa
01:00
-9.1°C -2.8°C -7.5°C - 7% 0.04kPa
02:00
-10°C -2.9°C -8.3°C - 5% 0.05kPa
03:00
-11°C -3.1°C -8.6°C - 5% 0.06kPa
04:00
-12°C -3.3°C -8.7°C - 96% 0.07kPa
05:00
-12°C -3.5°C -8.3°C - 70% 0.08kPa
06:00
-12°C -3.7°C -7.6°C - 49% 0.1kPa
07:00
-11°C -3.8°C -6.9°C - 96% 0.11kPa
08:00
-8.9°C -3.9°C -4.9°C - 83% 0.11kPa
09:00
-7°C -3.6°C -4.1°C - 79% 0.09kPa
10:00
-5.1°C -3.4°C -3.3°C - 76% 0.06kPa
11:00
-3.3°C -3.1°C -2.5°C - 72% 0.03kPa
12:00
-5.2°C -3.1°C -4.7°C - 69% 0.02kPa
13:00
-7.2°C -3.1°C -6.8°C - 67% 0.01kPa
14:00
-9.2°C -3.1°C -9°C - 64% 0kPa
15:00
-9.8°C -3.1°C -9.6°C - 59% 0kPa
16:00
-10°C -3.2°C -10°C - 54% 0.01kPa
17:00
-11°C -3.2°C -11°C - 50% 0.01kPa
18:00
-11°C -3.2°C -11°C - 56% 0kPa
19:00
-11°C -3.3°C -11°C - 63% 0kPa
20:00
-11°C -3.3°C -11°C - 70% 0kPa
21:00
-9.7°C -3.4°C -9.5°C - 79% 0kPa
22:00
-8.6°C -3.4°C -8.5°C - 89% 0kPa
23:00
-7.5°C -3.5°C -7.4°C - 98% 0kPa
Sun, Apr 12 Sunrise 05:10 Sunset 20:23
24:00
-7.7°C -3.5°C -7.5°C - 87% 0.01kPa
01:00
-8°C -3.5°C -7.7°C - 75% 0.01kPa
02:00
-8.2°C -3.5°C -7.8°C - 63% 0.01kPa
03:00
-7.6°C -3.5°C -6.7°C - 44% 0.02kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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