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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 99% failing
Wind Speed 76% failing

Currently

Real-time conditions
Frost Probability
15%
Soil Temperature3.1°C
Dew Point1.2°C (low dew point)
Wind Speed4.3m/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 95 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
Tue, Apr 21
04:00✕15%6.3m/s
05:00✕12%5.8m/s
06:00✕14%6.6m/s
07:00✕11%6m/s
08:00✕14%6.7m/s
09:00✕16%5.6m/s
10:00✕16%4.7m/s
11:00✕11%3.9m/s
12:00✕33%4.6m/s
13:00✕27%6.9m/s
14:00✕2.6%7m/s
15:00✕4.3%7.2m/s
16:00✕4.3%7.3m/s
17:00✕4.5%6.6m/s
18:00✕44%5m/s
19:00✕31%3.1m/s
20:00✕34%2m/s
21:00✕35%2.4m/s
22:00✕28%2.9m/s
23:00✕28%3.8m/s
Wed, Apr 22
24:00✕26%4.4m/s
01:00✕31%5.4m/s
02:00✕28%3.6m/s
03:00✕26%4.5m/s
04:00✕15%4.3m/s
05:00✕16%6.6m/s
06:00✕15%4.9m/s
07:00✕20%4.1m/s
08:00✕31%4.8m/s
09:00✕27%6.4m/s
10:00✕27%6.8m/s
11:00✕29%6.5m/s
12:00✕27%6.2m/s
13:00✕17%1.9m/s
14:00✕13%2.6m/s
15:00✕15%3.6m/s
16:00✕13%2.6m/s
17:00✕15%1.6m/s
18:00✕32%2.3m/s
19:00✕33%3.4m/s
20:00✕39%3.6m/s
21:00✕24%3.2m/s
22:00✕26%2.5m/s
23:00✕34%2m/s
Thu, Apr 23
24:00✕24%2.9m/s
01:00✕21%3m/s
02:00✕35%3.3m/s
03:00✕36%3.5m/s
04:00✕25%3.4m/s
05:00✕28%2.9m/s
06:00✕29%4.5m/s
07:00✕48%5.3m/s
08:00✕36%6.3m/s
09:00✕40%7m/s
10:00✕36%6.4m/s
11:00✕33%6.4m/s
12:00✕33%6.4m/s
13:00✕31%7.4m/s
14:00✕29%7.9m/s
15:00✕29%7.2m/s
16:00✕31%6m/s
17:00✕34%4.4m/s
18:00✕31%3.5m/s
19:00✕32%1.7m/s
20:00✕47%1.5m/s
21:00✕36%1.1m/s
22:00✕49%0.64m/s
23:00✕49%0.45m/s
Fri, Apr 24
24:00✕41%0.56m/s
01:00✕41%0.58m/s
02:00✕37%0.74m/s
03:00✕28%0.9m/s
04:00✕34%0.73m/s
05:00✕32%1.2m/s
06:00✕32%1.6m/s
07:00✕30%1.9m/s
08:00✕30%2.8m/s
09:00✕28%3m/s
10:00✕29%3.6m/s
11:00✕35%4.3m/s
12:00✕42%4.9m/s
13:00✕39%3.9m/s
14:00✕43%2.8m/s
15:00✕45%1.8m/s
16:00✕47%1.6m/s
17:00✕47%1.3m/s
18:00✕47%1m/s
19:00✕47%1.1m/s
20:00✕47%1.2m/s
21:00✕47%1.3m/s
22:00✕47%1.3m/s
23:00✕47%1.3m/s
Sat, Apr 25
24:00✕59%1.4m/s
01:00✕63%1.7m/s
02:00✕59%2m/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
Wed, Apr 22 Sunrise 04:38 Sunset 18:19
04:00 ☾
1.2°C 3.1°C 2.7°C - 100% 0.08kPa
05:00 ☾
1.4°C 3.1°C 3.5°C - 100% 0.11kPa
06:00 ☾
1.1°C 3.1°C 3.1°C - 84% 0.1kPa
07:00 ☾
2°C 3.3°C 4.4°C - 85% 0.13kPa
08:00 ☾
2.4°C 3.8°C 6.1°C - 100% 0.22kPa
09:00
2°C 4.1°C 7.1°C - 100% 0.3kPa
10:00
1.2°C 4.5°C 7.2°C - 98% 0.35kPa
11:00
-0.5°C 5.3°C 8.9°C - 100% 0.55kPa
12:00
2°C 5.6°C 6.4°C - 100% 0.26kPa
13:00
3.3°C 5.5°C 4.6°C - 100% 0.07kPa
14:00
3.5°C 5.3°C 4.3°C - 100% 0.04kPa
15:00
2.8°C 5.2°C 4°C - 100% 0.07kPa
16:00
2.6°C 5°C 3°C - 100% 0.02kPa
17:00
2.1°C 4.9°C 2.9°C - 97% 0.04kPa
18:00
0.6°C 4.7°C 3.7°C - 58% 0.16kPa
19:00 ☾
-1°C 4.4°C 2.6°C - 38% 0.17kPa
20:00 ☾
-1.2°C 4°C 2°C - 25% 0.15kPa
21:00 ☾
-0.5°C 3.6°C 1.9°C - 53% 0.11kPa
22:00 ☾
-0.4°C 3.3°C 1.7°C - 37% 0.1kPa
23:00 ☾
-0.9°C 3.1°C 1.2°C - 6% 0.1kPa
Thu, Apr 23 Sunrise 04:37 Sunset 18:21
24:00 ☾
-1.4°C 3.1°C 0.97°C - 33% 0.1kPa
01:00 ☾
-1.9°C 3.1°C 0.91°C - 69% 0.12kPa
02:00 ☾
-2.2°C 3°C 0.83°C - 92% 0.13kPa
03:00 ☾
-2.2°C 2.7°C 0.8°C - 72% 0.13kPa
04:00 ☾
-2.1°C 2.7°C 0.4°C - 62% 0.1kPa
05:00 ☾
-1.7°C 2.6°C 0.27°C - 47% 0.08kPa
06:00 ☾
-0.6°C 2.5°C 2.1°C - 45% 0.12kPa
07:00 ☾
-0.8°C 2.5°C 3.1°C - 6% 0.19kPa
08:00 ☾
-1.9°C 2.5°C 4°C - 90% 0.28kPa
09:00
-2.1°C 2.5°C 4.8°C - 100% 0.34kPa
10:00
-0.6°C 2.6°C 4.1°C - 93% 0.23kPa
11:00
-1.1°C 3°C 5.1°C - 100% 0.31kPa
12:00
-1.1°C 3.3°C 5.2°C - 99% 0.32kPa
13:00
-2.3°C 3.8°C 6°C - 92% 0.42kPa
14:00
-2.8°C 4.3°C 6.1°C - 87% 0.45kPa
15:00
-3.4°C 4.7°C 5.3°C - 100% 0.42kPa
16:00
-3.5°C 4.7°C 4.3°C - 100% 0.36kPa
17:00
-3.1°C 4.6°C 3.6°C - 66% 0.3kPa
18:00
-3.2°C 4.3°C 2.1°C - 89% 0.23kPa
19:00 ☾
-2.8°C 4.1°C 1.3°C - 53% 0.17kPa
20:00 ☾
-2.8°C 3.8°C 0.55°C - 6% 0.14kPa
21:00 ☾
-3.1°C 3.8°C -0.09°C - 44% 0.12kPa
22:00 ☾
-3.4°C 3.8°C -0.35°C - 6% 0.12kPa
23:00 ☾
-3.5°C 3.8°C -0.5°C - 6% 0.12kPa
Fri, Apr 24 Sunrise 04:35 Sunset 18:22
24:00 ☾
-3.7°C 3.8°C -0.75°C - 5% 0.11kPa
01:00 ☾
-3.8°C 3.8°C -0.9°C - 5% 0.11kPa
02:00 ☾
-3.8°C 3.8°C -0.9°C - 19% 0.11kPa
03:00 ☾
-3.7°C 3.7°C -0.9°C - 58% 0.11kPa
04:00 ☾
-3.6°C 3.5°C -0.58°C - 95% 0.12kPa
05:00 ☾
-3.4°C 3.3°C 0.15°C - 98% 0.14kPa
06:00 ☾
-3.1°C 3.1°C 0.59°C - 100% 0.15kPa
07:00 ☾
-2.5°C 3°C 0.88°C - 100% 0.14kPa
08:00 ☾
-1.8°C 3°C 2°C - 96% 0.17kPa
09:00
-1.7°C 3°C 2.7°C - 99% 0.2kPa
10:00
-2.4°C 3.2°C 2.3°C - 71% 0.2kPa
11:00
-3°C 3.3°C 1.8°C - 44% 0.21kPa
12:00
-3.6°C 3.5°C 1.4°C - 17% 0.21kPa
13:00
-4.1°C 3.5°C 0.44°C - 11% 0.18kPa
14:00
-4.5°C 3.5°C -0.52°C - 6% 0.15kPa
15:00
-4.9°C 3.5°C -1.5°C - 1% 0.13kPa
16:00
-5.3°C 3.5°C -1.7°C - 1% 0.13kPa
17:00
-5.6°C 3.5°C -1.9°C - 1% 0.13kPa
18:00
-6°C 3.5°C -2.1°C - 1% 0.13kPa
19:00 ☾
-6.2°C 3.5°C -2.1°C - 0% 0.14kPa
20:00 ☾
-6.4°C 3.5°C -2.2°C - 0% 0.14kPa
21:00 ☾
-6.6°C 3.5°C -2.2°C - 0% 0.15kPa
22:00 ☾
-6.3°C 3.2°C -1.5°C - 2% 0.17kPa
23:00 ☾
-6.1°C 3°C -0.74°C - 3% 0.19kPa
Sat, Apr 25 Sunrise 04:34 Sunset 18:23
24:00 ☾
-5.8°C 2.8°C 0.006°C - 5% 0.21kPa
01:00 ☾
-5.7°C 2.8°C 1.9°C - 5% 0.3kPa
02:00 ☾
-5.8°C 2.8°C 3.8°C - 4% 0.41kPa
03:00 ☾
-6.3°C 2.8°C 5.7°C - 4% 0.54kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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