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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)
Wind Speed 100% failing
Frost Probability 97% failing
Time Window 88% failing

Currently

Real-time conditions
Frost Probability
68%
Soil Temperature1.3°C
Dew Point1.3°C (low dew point)
Wind Speed6.3m/s (moderate winds)
Cloud Cover6%

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 91 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
Wed, Apr 8
14:00✕55%6.9m/s
15:00✕55%7.2m/s
16:00✕55%6.4m/s
17:00✕55%6.3m/s
18:00✕53%4.3m/s
19:00✕50%2.9m/s
20:00✕54%1.2m/s
21:00✕52%2m/s
22:00✕43%3.7m/s
23:00✕35%4m/s
Thu, Apr 9
24:00✕36%4.3m/s
01:00✕33%4.4m/s
02:00✕29%4.5m/s
03:00✕23%4.4m/s
04:00✓38%4.4m/s
05:00✓37%4.9m/s
06:00✓47%5m/s
07:00✕57%5.9m/s
08:00✕62%7.1m/s
09:00✕66%6.8m/s
10:00✕68%6.3m/s
11:00✕39%6.6m/s
12:00✕29%6.8m/s
13:00✕29%6.4m/s
14:00✕2.8%6.2m/s
15:00✕2.8%6.3m/s
16:00✕2.8%5.7m/s
17:00✕2.8%4.4m/s
18:00✕3%3.6m/s
19:00✕3%3.4m/s
20:00✕2.5%3.8m/s
21:00✕16%4.2m/s
22:00✕16%4.4m/s
23:00✕22%4.1m/s
Fri, Apr 10
24:00✕26%3.4m/s
01:00✕19%3m/s
02:00✕17%3.2m/s
03:00✕18%3m/s
04:00✓17%2.8m/s
05:00✓17%3m/s
06:00✓17%3m/s
07:00✕22%2.6m/s
08:00✕22%2.5m/s
09:00✕33%2.5m/s
10:00✕35%2.7m/s
11:00✕3.2%3.6m/s
12:00✕3.2%3.5m/s
13:00✕0%3.6m/s
14:00✕0%4.6m/s
15:00✕0%5m/s
16:00✕0%3.9m/s
17:00✕0%3.4m/s
18:00✕0%3.1m/s
19:00✕0%3.8m/s
20:00✕1.5%4.3m/s
21:00✕1.7%3.2m/s
22:00✕2.3%2.4m/s
23:00✕1.7%3.2m/s
Sat, Apr 11
24:00✕1.8%3.9m/s
01:00✕18%3.8m/s
02:00✕18%3.7m/s
03:00✕13%4.6m/s
04:00✓13%5m/s
05:00✓14%6.8m/s
06:00✓11%6.6m/s
07:00✕14%6.3m/s
08:00✕11%6.6m/s
09:00✕11%5.8m/s
10:00✕13%5.3m/s
11:00✕16%5.1m/s
12:00✕1.5%4.7m/s
13:00✕1.2%4.3m/s
14:00✕11%3m/s
15:00✕9%5.6m/s
16:00✕7%6m/s
17:00✕9%6.5m/s
18:00✕16%7m/s
19:00✕16%7.4m/s
20:00✕16%7.8m/s
21:00✕16%8.3m/s
22:00✕16%7.9m/s
23:00✕16%7.6m/s
Sun, Apr 12
24:00✕16%7.2m/s
01:00✕20%7.2m/s
02:00✕20%7.2m/s
03:00✕20%7.3m/s
04:00✓23%7.7m/s
05:00✓31%8.1m/s
06:00✓36%8.6m/s
07:00✕36%7.9m/s
08:00✕31%7.3m/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
Asia/Tokyo
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Thu, Apr 9 Sunrise 04:57 Sunset 18:05
10:00 ☾
1.3°C 1.3°C 8.2°C - 6% 0.41kPa
11:00 ☾
1.7°C 2.8°C 9.1°C - 80% 0.46kPa
12:00 ☾
2.2°C 4.2°C 9.5°C - 84% 0.47kPa
13:00 ☾
2.3°C 5.2°C 9.5°C - 96% 0.47kPa
14:00 ☾
2.6°C 6.1°C 10°C - 100% 0.5kPa
15:00 ☾
2.7°C 6.7°C 9.9°C - 100% 0.48kPa
16:00 ☾
2.8°C 7°C 9.3°C - 100% 0.42kPa
17:00 ☾
3°C 7°C 8.4°C - 100% 0.34kPa
18:00 ☾
3°C 6.7°C 7.1°C - 100% 0.25kPa
19:00 ☾
2.7°C 6.4°C 6.3°C - 100% 0.21kPa
20:00 ☾
2.5°C 6.1°C 5.8°C - 100% 0.19kPa
21:00 ☾
2.5°C 5.7°C 5.4°C - 100% 0.16kPa
22:00 ☾
2.6°C 5.4°C 5.1°C - 96% 0.14kPa
23:00 ☾
2.4°C 5°C 4.4°C - 33% 0.1kPa
Fri, Apr 10 Sunrise 04:57 Sunset 18:05
24:00 ☾
2.2°C 4.6°C 3.8°C - 24% 0.08kPa
01:00 ☾
2.7°C 4.3°C 4.1°C - 45% 0.08kPa
02:00 ☾
2.9°C 4°C 4.5°C - 83% 0.09kPa
03:00 ☾
3.2°C 3.9°C 4.8°C - 74% 0.09kPa
04:00 ☾
3.1°C 3.8°C 4.9°C - 100% 0.1kPa
05:00 ☾
3.4°C 3.8°C 5.2°C - 100% 0.1kPa
06:00 ☾
3.6°C 3.8°C 5.3°C - 100% 0.1kPa
07:00 ☾
3.6°C 3.8°C 5.6°C - 100% 0.12kPa
08:00 ☾
3.8°C 3.9°C 6.1°C - 100% 0.14kPa
09:00 ☾
4°C 4.4°C 7.6°C - 100% 0.23kPa
10:00 ☾
3.9°C 5.6°C 10°C - 100% 0.42kPa
11:00 ☾
3.9°C 7°C 12°C - 100% 0.55kPa
12:00 ☾
4.1°C 7.9°C 12°C - 100% 0.55kPa
13:00 ☾
3.8°C 8.7°C 12°C - 100% 0.59kPa
14:00 ☾
3.9°C 9.2°C 12°C - 100% 0.57kPa
15:00 ☾
4.4°C 9.4°C 10°C - 100% 0.42kPa
16:00 ☾
4.8°C 9.2°C 8.6°C - 100% 0.26kPa
17:00 ☾
4.9°C 8.9°C 7.9°C - 100% 0.2kPa
18:00 ☾
4.7°C 8.5°C 7.1°C - 100% 0.15kPa
19:00 ☾
4.4°C 8.1°C 6.5°C - 100% 0.13kPa
20:00 ☾
3.6°C 7.6°C 5.4°C - 100% 0.11kPa
21:00 ☾
3.3°C 7.1°C 5.2°C - 100% 0.11kPa
22:00 ☾
3.5°C 6.8°C 5.4°C - 52% 0.11kPa
23:00 ☾
3.7°C 6.5°C 5.7°C - 100% 0.12kPa
Sat, Apr 11 Sunrise 04:55 Sunset 18:06
24:00 ☾
3.9°C 6.3°C 5.9°C - 71% 0.12kPa
01:00 ☾
3.7°C 6°C 5.5°C - 100% 0.11kPa
02:00 ☾
4.2°C 5.8°C 6.3°C - 100% 0.13kPa
03:00 ☾
5.3°C 5.8°C 6.9°C - 100% 0.1kPa
04:00 ☾
6.1°C 5.7°C 7.3°C - 92% 0.08kPa
05:00 ☾
6.3°C 5.8°C 8.4°C - 100% 0.15kPa
06:00 ☾
6.4°C 5.9°C 7.7°C - 100% 0.09kPa
07:00 ☾
5.9°C 5.9°C 7.5°C - 100% 0.11kPa
08:00 ☾
5.8°C 5.9°C 6.9°C - 100% 0.07kPa
09:00 ☾
4.8°C 5.9°C 6.2°C - 100% 0.09kPa
10:00 ☾
4.5°C 5.8°C 5.8°C - 100% 0.08kPa
11:00 ☾
4.3°C 5.9°C 6.2°C - 100% 0.11kPa
12:00 ☾
4.3°C 6°C 6.4°C - 100% 0.13kPa
13:00 ☾
3.9°C 6°C 5.4°C - 100% 0.09kPa
14:00 ☾
3.5°C 5.9°C 4.1°C - 100% 0.03kPa
15:00 ☾
2.4°C 5.7°C 2.7°C - 100% 0.01kPa
16:00 ☾
1.7°C 4.6°C 2°C - 100% 0.01kPa
17:00 ☾
1°C 3.6°C 1.3°C - 100% 0.01kPa
18:00 ☾
0.4°C 2.6°C 0.58°C - 100% 0.01kPa
19:00 ☾
0.3°C 2.5°C 0.55°C - 100% 0.01kPa
20:00 ☾
0.3°C 2.4°C 0.52°C - 100% 0.01kPa
21:00 ☾
0.3°C 2.4°C 0.49°C - 100% 0.01kPa
22:00 ☾
0.1°C 2.3°C 0.46°C - 100% 0.02kPa
23:00 ☾
-0.2°C 2.3°C 0.43°C - 100% 0.03kPa
Sun, Apr 12 Sunrise 04:53 Sunset 18:07
24:00 ☾
-0.4°C 2.2°C 0.41°C - 100% 0.03kPa
01:00 ☾
-0.1°C 2.2°C 0.97°C - 100% 0.05kPa
02:00 ☾
0.1°C 2.2°C 1.5°C - 100% 0.07kPa
03:00 ☾
0.3°C 2.1°C 2.1°C - 100% 0.09kPa
04:00 ☾
-0.3°C 2.1°C 2.4°C - 100% 0.13kPa
05:00 ☾
-0.8°C 2.1°C 2.7°C - 100% 0.17kPa
06:00 ☾
-1.5°C 2°C 3°C - 100% 0.21kPa
07:00 ☾
-0.9°C 2.1°C 3.4°C - 98% 0.21kPa
08:00 ☾
-0.3°C 2.1°C 3.7°C - 96% 0.2kPa
09:00 ☾
0.2°C 2.1°C 4.1°C - 94% 0.2kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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