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More Morning Frost in Swedish Lapland
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Rule Morning Frost

Porjus - Morning Frost - Swedish Lapland

Porjus, Norrbotten, Sweden

Frost crystals on calm, cold mornings near sunrise

Currently

Real-time conditions
Frost Probability
55%
Soil Temperature-1.1°C
Dew Point-2.6°C (low dew point)
Wind Speed6.0m/s (moderate winds)
Cloud Cover28%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Stockholm
Next opportunity
Light Frost at Sunrise
Porjus
Thu, Apr 16 · 05:00–06:00 · 1h window
Low confidence
39%
❄️Frost Probability66%
Soil Temperature: 2.0°C
Dew Point: -1.0°C (low dew point)
Wind Speed: 0.7m/s (calm conditions)
Cloud Cover: 79%

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 74 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
Thu, Apr 9
06:00✓50%4.4m/s
07:00✕54%4.6m/s
08:00✕61%5.1m/s
09:00✕57%5.6m/s
10:00✕55%6m/s
11:00✕59%6.2m/s
12:00✕55%6.1m/s
13:00✕49%5.9m/s
14:00✕50%5.4m/s
15:00✕50%5.1m/s
16:00✕50%5.3m/s
17:00✕50%5.4m/s
18:00✕50%5.2m/s
19:00✕50%5.2m/s
20:00✕50%5.6m/s
21:00✕48%5.7m/s
22:00✕51%5.4m/s
23:00✕57%5m/s
Fri, Apr 10
24:00✕65%4.5m/s
01:00✕65%4.5m/s
02:00✕65%4.6m/s
03:00✕65%4.7m/s
04:00✓65%4.8m/s
05:00✓65%4.8m/s
06:00✓65%4.9m/s
07:00✕65%5m/s
08:00✕65%5.3m/s
09:00✕66%5.8m/s
10:00✕66%6m/s
11:00✕66%6m/s
12:00✕66%5.9m/s
13:00✕74%5.7m/s
14:00✕76%5.3m/s
15:00✕62%5.1m/s
16:00✕61%4.8m/s
17:00✕62%4.8m/s
18:00✕61%4.8m/s
19:00✕65%4.5m/s
20:00✕56%4.2m/s
21:00✕67%4.2m/s
22:00✕67%3.7m/s
23:00✕59%3.4m/s
Sat, Apr 11
24:00✕52%3.1m/s
01:00✕52%2.9m/s
02:00✕57%2.6m/s
03:00✕57%2.3m/s
04:00✓56%1.6m/s
05:00✓52%1.4m/s
06:00✓52%1.2m/s
07:00✕52%1.6m/s
08:00✕56%1.6m/s
09:00✕65%1.9m/s
10:00✕72%2.6m/s
11:00✕70%3m/s
12:00✕70%3.2m/s
13:00✕70%3.4m/s
14:00✕70%3.5m/s
15:00✕59%3.3m/s
16:00✕53%3.2m/s
17:00✕48%3m/s
18:00✕48%2.9m/s
19:00✕48%2.9m/s
20:00✕48%2.8m/s
21:00✕50%2.8m/s
22:00✕50%2.7m/s
23:00✕50%2.7m/s
Sun, Apr 12
24:00✕54%2.6m/s
01:00✕55%2.5m/s
02:00✕58%2.4m/s
03:00✕61%2.6m/s
04:00✓68%2.8m/s
05:00✓78%3m/s
06:00✓78%3.2m/s
07:00✕78%3.3m/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 05:21 Sunset 20:05
10:00
-2.6°C -1.1°C -0.1°C - 28% 0.1kPa
11:00
-1.7°C -1°C 0.4°C - 23% 0.09kPa
12:00
-0.8°C -1°C 1°C - 38% 0.08kPa
13:00
-0.1°C -0.95°C 1.4°C - 71% 0.07kPa
14:00
0.4°C -0.95°C 1.7°C - 99% 0.06kPa
15:00
0.7°C -0.91°C 1.8°C - 97% 0.06kPa
16:00
0.7°C -0.83°C 1.8°C - 100% 0.05kPa
17:00
0.4°C -0.83°C 1.7°C - 100% 0.06kPa
18:00
-0.1°C -0.73°C 1.3°C - 100% 0.06kPa
19:00
-0.4°C -0.73°C 1°C - 100% 0.07kPa
20:00
-0.8°C -0.73°C 0.83°C - 99% 0.07kPa
21:00 ☾
-1°C -0.73°C 0.58°C - 93% 0.07kPa
22:00 ☾
-1.7°C -0.72°C -0.23°C - 78% 0.06kPa
23:00 ☾
-2.6°C -0.72°C -1°C - 28% 0.06kPa
Fri, Apr 10 Sunrise 05:21 Sunset 20:05
24:00 ☾
-3.8°C -0.72°C -2.3°C - 5% 0.06kPa
01:00 ☾
-4.7°C -0.72°C -3.2°C - 5% 0.05kPa
02:00 ☾
-5.3°C -0.73°C -3.7°C - 5% 0.05kPa
03:00 ☾
-5.8°C -0.74°C -4°C - 5% 0.06kPa
04:00 ☾
-6.2°C -0.82°C -4.4°C - 5% 0.06kPa
05:00 ☾
-6.5°C -0.89°C -4.6°C - 5% 0.06kPa
06:00
-6.6°C -0.98°C -4.6°C - 5% 0.06kPa
07:00
-5.9°C -1.1°C -3.7°C - 5% 0.07kPa
08:00
-4.6°C -1.1°C -2°C - 5% 0.09kPa
09:00
-3.3°C -1.1°C -0.54°C - 5% 0.11kPa
10:00
-2.3°C -1.1°C 0.51°C - 5% 0.12kPa
11:00
-1.5°C -1°C 1.3°C - 5% 0.12kPa
12:00
-0.9°C -0.93°C 2°C - 5% 0.13kPa
13:00
-0.6°C -0.83°C 2.4°C - 5% 0.14kPa
14:00
-0.5°C -0.83°C 2.7°C - 5% 0.15kPa
15:00
-0.4°C -0.73°C 2.9°C - 61% 0.16kPa
16:00
-0.7°C -0.63°C 2.6°C - 84% 0.16kPa
17:00
-1.4°C -0.65°C 2.2°C - 69% 0.16kPa
18:00
-2.3°C -0.55°C 1.6°C - 88% 0.17kPa
19:00
-3.2°C -0.55°C 0.38°C - 45% 0.15kPa
20:00
-3.8°C -0.55°C -1.2°C - 47% 0.1kPa
21:00 ☾
-4°C -0.59°C -2.2°C - 6% 0.07kPa
22:00 ☾
-4.3°C -0.59°C -3.1°C - 5% 0.04kPa
23:00 ☾
-4.6°C -0.59°C -3.9°C - 18% 0.03kPa
Sat, Apr 11 Sunrise 05:17 Sunset 20:09
24:00 ☾
-4.9°C -0.6°C -4.3°C - 42% 0.02kPa
01:00 ☾
-5.4°C -0.62°C -4.6°C - 48% 0.02kPa
02:00 ☾
-5.8°C -0.66°C -5.2°C - 36% 0.02kPa
03:00 ☾
-5.7°C -0.78°C -5.3°C - 32% 0.01kPa
04:00 ☾
-6.7°C -0.9°C -6.3°C - 43% 0.01kPa
05:00 ☾
-7.6°C -1°C -7.3°C - 96% 0.01kPa
06:00
-7.4°C -1.3°C -6.9°C - 82% 0.01kPa
07:00
-5.7°C -1.5°C -4.8°C - 98% 0.03kPa
08:00
-4.5°C -1.5°C -2.7°C - 91% 0.06kPa
09:00
-3.7°C -1.5°C -1.1°C - 12% 0.1kPa
10:00
-2.6°C -1.5°C 0.28°C - 5% 0.12kPa
11:00
-1.4°C -1.3°C 1.3°C - 5% 0.12kPa
12:00
-0.5°C -1.2°C 2.2°C - 5% 0.13kPa
13:00
0°C -1.1°C 3°C - 5% 0.15kPa
14:00
0.4°C -1°C 3.4°C - 5% 0.15kPa
15:00
0°C -0.76°C 2.1°C - 37% 0.1kPa
16:00
-0.4°C -0.51°C 0.85°C - 68% 0.06kPa
17:00
-0.9°C -0.26°C -0.41°C - 100% 0.02kPa
18:00
-1.1°C -0.26°C -0.57°C - 100% 0.02kPa
19:00
-1.3°C -0.26°C -0.72°C - 100% 0.02kPa
20:00
-1.5°C -0.25°C -0.88°C - 100% 0.03kPa
21:00 ☾
-1.8°C -0.25°C -1.1°C - 100% 0.03kPa
22:00 ☾
-2.1°C -0.25°C -1.3°C - 100% 0.03kPa
23:00 ☾
-2.3°C -0.25°C -1.5°C - 100% 0.03kPa
Sun, Apr 12 Sunrise 05:12 Sunset 20:12
24:00 ☾
-2.4°C -0.27°C -1.4°C - 84% 0.04kPa
01:00 ☾
-2.5°C -0.29°C -1.2°C - 68% 0.05kPa
02:00 ☾
-2.6°C -0.31°C -1.1°C - 53% 0.06kPa
03:00 ☾
-2.4°C -0.31°C -0.24°C - 37% 0.09kPa
04:00 ☾
-2.2°C -0.31°C 0.6°C - 21% 0.12kPa
05:00 ☾
-2°C -0.31°C 1.4°C - 5% 0.15kPa
06:00
-1.7°C -0.24°C 2°C - 5% 0.17kPa
07:00
-1.5°C -0.18°C 2.6°C - 5% 0.19kPa
08:00
-1.2°C -0.11°C 3.2°C - 5% 0.21kPa
09:00
-0.8°C -0.08°C 3.1°C - 5% 0.19kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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