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Rule Morning Frost

Biei - Morning Frost - Japan

Biei, Hokkaido, Japan

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)
Time Window 100% failing
Frost Probability 100% failing
Wind Speed 88% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature11.5°C
Dew Point7.9°C (moderate dew point)
Wind Speed2.4m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Tokyo

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

Japan's winter transforms its iconic landscapes into scenes of serene beauty that embody the aesthetic principle of wabi-sabi—finding beauty in impermanence and imperfection. This forecast tracks frost and freezing conditions across Japan's diverse winter photography destinations.

Winter photography opportunities across Japan:

  • Kyoto's snow-covered temples - Kinkaku-ji golden pavilion and Fushimi Inari shrine gates become ethereal under fresh snow
  • Hokkaido's frozen landscapes - The Blue Pond in Biei develops stunning ice patterns and frost-covered trees create otherworldly scenes
  • Mountain shrines - Nikko's ornate Toshogu shrine complex gains dramatic contrast under winter snow
  • Historic streets - Takayama's preserved Edo-period town appears suspended in time with frost-laden roofs
  • Ice formations - Mountain shrines and waterfalls develop intricate ice sculptures

The season runs from December through February across most of Japan, with Hokkaido remaining frozen well into March. Early morning shoots capture hoarfrost at its peak before the sun melts the delicate ice crystals. The contrast between traditional architecture and pristine snow creates compositions rich in cultural depth.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Tokyo
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Sun, May 24
13:00✕0%5.1m/s
14:00✕0%4.9m/s
15:00✕0%5.4m/s
16:00✕0%5m/s
17:00✕0%4.3m/s
18:00✕0%3.3m/s
19:00✕0%3.1m/s
20:00✕0%3.1m/s
21:00✕0%2.5m/s
22:00✕0%2.4m/s
23:00✕0%2.1m/s
Mon, May 25
24:00✕0%1.8m/s
01:00✕0%1.4m/s
02:00✕0%1.5m/s
03:00✕0%1.7m/s
04:00✕0%1.7m/s
05:00✕0%1.7m/s
06:00✕0%1.4m/s
07:00✕0%1.3m/s
08:00✕0%1.9m/s
09:00✕0%1.8m/s
10:00✕0%2.3m/s
11:00✕0%2.1m/s
12:00✕0%2.1m/s
13:00✕0%2m/s
14:00✕0%2.1m/s
15:00✕0%2.4m/s
16:00✕0%2.1m/s
17:00✕0%2.6m/s
18:00✕0%1.3m/s
19:00✕0%0.32m/s
20:00✕0%1.6m/s
21:00✕0%2.6m/s
22:00✕0%2.4m/s
23:00✕0%3.1m/s
Tue, May 26
24:00✕0%3.2m/s
01:00✕0%3m/s
02:00✕0%2.9m/s
03:00✕0%3m/s
04:00✕0%3.1m/s
05:00✕0%3m/s
06:00✕0%3m/s
07:00✕0%3.3m/s
08:00✕0%3.8m/s
09:00✕0%4.2m/s
10:00✕0%4.7m/s
11:00✕0%4.9m/s
12:00✕0%4.7m/s
13:00✕0%4.8m/s
14:00✕0%5m/s
15:00✕0%4.6m/s
16:00✕0%3.9m/s
17:00✕0%3.7m/s
18:00✕0%3.1m/s
19:00✕0%3m/s
20:00✕0%2.9m/s
21:00✕0%2.9m/s
22:00✕0%2.3m/s
23:00✕0%3.2m/s
Wed, May 27
24:00✕0%2.5m/s
01:00✕0%1.7m/s
02:00✕0%1m/s
03:00✕0%2m/s
04:00✕0%2.2m/s
05:00✕0%2.4m/s
06:00✕0%2.5m/s
07:00✕0%2.6m/s
08:00✕0%2.6m/s
09:00✕0%2.7m/s
10:00✕0%2.4m/s
11:00✕0%2.1m/s
12:00✕0%1.9m/s
13:00✕0%1.7m/s
14:00✕0%1.5m/s
15:00✕0%1.2m/s
16:00✕0%1.5m/s
17:00✕0%1.8m/s
18:00✕0%2m/s
19:00✕0%1.9m/s
20:00✕0%1.8m/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
Asia/Tokyo
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sun, May 24 Sunrise 03:57 Sunset 18:56
22:00 ☾
7.9°C 11°C 9°C - 100% 0.09kPa
23:00 ☾
8°C 11°C 9.2°C - 100% 0.09kPa
Mon, May 25 Sunrise 03:57 Sunset 18:56
24:00 ☾
8.2°C 11°C 9.3°C - 100% 0.08kPa
01:00 ☾
8.3°C 11°C 9.3°C - 100% 0.08kPa
02:00 ☾
8.4°C 11°C 9.3°C - 100% 0.07kPa
03:00 ☾
8.4°C 11°C 9.6°C - 100% 0.09kPa
04:00 ☾
8.6°C 11°C 9.6°C - 100% 0.08kPa
05:00 ☾
8.8°C 10°C 9.8°C - 82% 0.08kPa
06:00 ☾
9°C 10°C 11°C - 100% 0.14kPa
07:00 ☾
9.4°C 10°C 11°C - 68% 0.15kPa
08:00 ☾
10°C 11°C 12°C - 82% 0.2kPa
09:00
11°C 11°C 13°C - 76% 0.24kPa
10:00
11°C 11°C 15°C - 63% 0.36kPa
11:00
11°C 12°C 16°C - 70% 0.52kPa
12:00
10°C 12°C 17°C - 52% 0.68kPa
13:00
9.9°C 13°C 18°C - 16% 0.87kPa
14:00
9.4°C 13°C 19°C - 15% 1kPa
15:00
9.1°C 14°C 19°C - 6% 1.1kPa
16:00
9.2°C 14°C 19°C - 0% 1kPa
17:00
11°C 14°C 18°C - 6% 0.8kPa
18:00
11°C 14°C 16°C - 0% 0.47kPa
19:00 ☾
10°C 14°C 13°C - 5% 0.27kPa
20:00 ☾
9.9°C 14°C 12°C - 5% 0.23kPa
21:00 ☾
9.5°C 13°C 12°C - 5% 0.19kPa
22:00 ☾
9.3°C 13°C 11°C - 34% 0.17kPa
23:00 ☾
9.2°C 13°C 11°C - 16% 0.15kPa
Tue, May 26 Sunrise 03:56 Sunset 18:57
24:00 ☾
9.2°C 12°C 11°C - 97% 0.13kPa
01:00 ☾
9.4°C 12°C 11°C - 100% 0.1kPa
02:00 ☾
9.4°C 12°C 11°C - 76% 0.12kPa
03:00 ☾
9.4°C 12°C 11°C - 100% 0.1kPa
04:00 ☾
9.3°C 12°C 11°C - 100% 0.11kPa
05:00 ☾
9.8°C 12°C 12°C - 100% 0.17kPa
06:00 ☾
11°C 12°C 14°C - 100% 0.27kPa
07:00 ☾
11°C 12°C 15°C - 100% 0.39kPa
08:00 ☾
11°C 12°C 16°C - 100% 0.5kPa
09:00
11°C 12°C 17°C - 100% 0.64kPa
10:00
10°C 12°C 18°C - 100% 0.87kPa
11:00
10°C 13°C 20°C - 100% 1.1kPa
12:00
10°C 13°C 21°C - 100% 1.3kPa
13:00
10°C 14°C 21°C - 97% 1.2kPa
14:00
10°C 14°C 21°C - 100% 1.3kPa
15:00
11°C 14°C 21°C - 100% 1.2kPa
16:00
12°C 15°C 21°C - 97% 1.1kPa
17:00
12°C 15°C 20°C - 54% 0.83kPa
18:00
13°C 15°C 17°C - 100% 0.53kPa
19:00 ☾
12°C 15°C 16°C - 95% 0.38kPa
20:00 ☾
12°C 15°C 14°C - 100% 0.23kPa
21:00 ☾
12°C 14°C 14°C - 42% 0.22kPa
22:00 ☾
12°C 14°C 13°C - 100% 0.13kPa
23:00 ☾
12°C 14°C 13°C - 43% 0.16kPa
Wed, May 27 Sunrise 03:56 Sunset 18:58
24:00 ☾
11°C 14°C 13°C - 96% 0.14kPa
01:00 ☾
11°C 14°C 13°C - 99% 0.14kPa
02:00 ☾
11°C 13°C 12°C - 50% 0.11kPa
03:00 ☾
11°C 13°C 12°C - 80% 0.1kPa
04:00 ☾
11°C 14°C 15°C - 86% 0.36kPa
05:00 ☾
12°C 14°C 18°C - 93% 0.73kPa
06:00 ☾
11°C 15°C 21°C - 100% 1.2kPa
07:00 ☾
11°C 15°C 22°C - 100% 1.3kPa
08:00 ☾
11°C 16°C 22°C - 100% 1.3kPa
09:00
11°C 16°C 22°C - 100% 1.3kPa
10:00
12°C 16°C 21°C - 97% 1kPa
11:00
13°C 16°C 20°C - 94% 0.8kPa
12:00
13°C 17°C 18°C - 90% 0.59kPa
13:00
13°C 16°C 17°C - 94% 0.43kPa
14:00
12°C 16°C 15°C - 97% 0.31kPa
15:00
12°C 16°C 14°C - 100% 0.2kPa
16:00
11°C 15°C 13°C - 100% 0.21kPa
17:00
11°C 15°C 13°C - 100% 0.22kPa
18:00
11°C 15°C 13°C - 100% 0.23kPa
19:00 ☾
10°C 15°C 13°C - 100% 0.27kPa
20:00 ☾
9.8°C 14°C 13°C - 100% 0.31kPa
21:00 ☾
9.5°C 14°C 13°C - 100% 0.36kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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