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Rule Morning Frost

Nikko - Morning Frost - Japan

Nikkō, Tochigi, 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)
Frost Probability 100% failing
Time Window 88% failing
Wind Speed 83% failing

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature8.9°C
Dew Point3.1°C (low dew point)
Wind Speed1.9m/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 74 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
Thu, Apr 9
13:00✕2.9%2.8m/s
14:00✕0%2.7m/s
15:00✕0%2.4m/s
16:00✕0%1.9m/s
17:00✕0%1.4m/s
18:00✕0%0.92m/s
19:00✕0%0.96m/s
20:00✕0%1.2m/s
21:00✕0%1.5m/s
22:00✕0%1.6m/s
23:00✕0%1.7m/s
Fri, Apr 10
24:00✕2.1%1.7m/s
01:00✕1.8%1.6m/s
02:00✕1.6%1.8m/s
03:00✕1.8%1.4m/s
04:00✓1.4%1.6m/s
05:00✓1.4%1.4m/s
06:00✓1.4%1.2m/s
07:00✕1.8%1.4m/s
08:00✕1.4%1.4m/s
09:00✕1.2%1.7m/s
10:00✕1.2%1.7m/s
11:00✕2.4%2.7m/s
12:00✕0%3.2m/s
13:00✕0%2.6m/s
14:00✕0%1.4m/s
15:00✕0%1.9m/s
16:00✕0%1.6m/s
17:00✕0%1.5m/s
18:00✕0%1.2m/s
19:00✕0%2.3m/s
20:00✕0%1.9m/s
21:00✕0%2.2m/s
22:00✕0%2.3m/s
23:00✕0%2.5m/s
Sat, Apr 11
24:00✕0%2.4m/s
01:00✕0%2m/s
02:00✕0%2m/s
03:00✕0%2.5m/s
04:00✓0%2.3m/s
05:00✓0%2.1m/s
06:00✓0%2.1m/s
07:00✕0%1.5m/s
08:00✕0%1.3m/s
09:00✕0%2m/s
10:00✕0%2m/s
11:00✕0%2.4m/s
12:00✕0%2.2m/s
13:00✕0%2.9m/s
14:00✕0%3.6m/s
15:00✕0%3.4m/s
16:00✕0%3.3m/s
17:00✕0%3.3m/s
18:00✕0%3.8m/s
19:00✕0%4m/s
20:00✕0%4m/s
21:00✕0%4m/s
22:00✕0%3.7m/s
23:00✕4.9%3.5m/s
Sun, Apr 12
24:00✕48%3.3m/s
01:00✕46%3.9m/s
02:00✕37%4.5m/s
03:00✕37%5.1m/s
04:00✓35%4.8m/s
05:00✓35%4.6m/s
06:00✓35%4.3m/s
07:00✕37%3.9m/s
08:00✕3.6%3.6m/s
09:00✕3.6%3.2m/s
10:00✕3.4%2.8m/s
11:00✕3.3%2.5m/s
12:00✕3.4%2.1m/s
13:00✕3.4%2.2m/s
14:00✕3.4%2.3m/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 05:15 Sunset 18:10
16:00 ☾
3.1°C 8.9°C 11°C - 100% 0.51kPa
17:00 ☾
4°C 9°C 9°C - 100% 0.33kPa
18:00 ☾
3.6°C 8.9°C 7.5°C - 100% 0.24kPa
19:00 ☾
3.3°C 8.7°C 7.1°C - 100% 0.24kPa
20:00 ☾
2.7°C 8.6°C 6.2°C - 100% 0.21kPa
21:00 ☾
2.9°C 8.4°C 6.3°C - 100% 0.2kPa
22:00 ☾
3.7°C 8.2°C 6.2°C - 100% 0.16kPa
23:00 ☾
3.6°C 8.1°C 6.4°C - 100% 0.17kPa
Fri, Apr 10 Sunrise 05:15 Sunset 18:10
24:00 ☾
4.1°C 8°C 6°C - 100% 0.12kPa
01:00 ☾
4.3°C 7.9°C 5.7°C - 100% 0.09kPa
02:00 ☾
3.9°C 7.7°C 4.9°C - 100% 0.06kPa
03:00 ☾
4.3°C 7.5°C 5.4°C - 100% 0.07kPa
04:00 ☾
4.7°C 7.4°C 5.6°C - 100% 0.06kPa
05:00 ☾
4.9°C 7.3°C 5.6°C - 100% 0.04kPa
06:00 ☾
4.9°C 7.2°C 5.7°C - 100% 0.05kPa
07:00 ☾
5.3°C 7.1°C 6.3°C - 100% 0.06kPa
08:00 ☾
6°C 7.2°C 7°C - 100% 0.07kPa
09:00 ☾
7°C 7.2°C 7.5°C - 100% 0.04kPa
10:00 ☾
7.8°C 7.4°C 8.6°C - 100% 0.05kPa
11:00 ☾
9.4°C 8°C 12°C - 100% 0.22kPa
12:00 ☾
10°C 8.6°C 14°C - 100% 0.39kPa
13:00 ☾
9.9°C 9.3°C 15°C - 100% 0.45kPa
14:00 ☾
9.5°C 9.5°C 12°C - 100% 0.2kPa
15:00 ☾
9.5°C 9.8°C 12°C - 100% 0.25kPa
16:00 ☾
9.5°C 9.9°C 11°C - 100% 0.12kPa
17:00 ☾
9.8°C 10°C 12°C - 100% 0.15kPa
18:00 ☾
9.9°C 10°C 11°C - 100% 0.06kPa
19:00 ☾
9.4°C 10°C 11°C - 100% 0.13kPa
20:00 ☾
9.3°C 10°C 11°C - 0% 0.14kPa
21:00 ☾
8.1°C 9.9°C 9.6°C - 12% 0.12kPa
22:00 ☾
7.5°C 9.8°C 9.6°C - 14% 0.15kPa
23:00 ☾
7.7°C 9.6°C 9.8°C - 90% 0.16kPa
Sat, Apr 11 Sunrise 05:14 Sunset 18:11
24:00 ☾
8.5°C 9.6°C 10°C - 99% 0.13kPa
01:00 ☾
8.5°C 9.5°C 10°C - 100% 0.12kPa
02:00 ☾
8.3°C 9.5°C 9.8°C - 100% 0.11kPa
03:00 ☾
8.2°C 9.4°C 9.6°C - 100% 0.11kPa
04:00 ☾
8.1°C 9.3°C 9.3°C - 61% 0.09kPa
05:00 ☾
7.9°C 9.2°C 8.9°C - 23% 0.08kPa
06:00 ☾
8.2°C 9.1°C 9.2°C - 26% 0.08kPa
07:00 ☾
8.7°C 9.2°C 11°C - 67% 0.17kPa
08:00 ☾
8.5°C 9.6°C 12°C - 9% 0.31kPa
09:00 ☾
6°C 10°C 13°C - 10% 0.59kPa
10:00 ☾
5.3°C 11°C 14°C - 2% 0.7kPa
11:00 ☾
3.8°C 11°C 15°C - 1% 0.9kPa
12:00 ☾
2.9°C 12°C 16°C - 0% 1kPa
13:00 ☾
2.5°C 12°C 16°C - 0% 1.1kPa
14:00 ☾
2.3°C 13°C 16°C - 0% 1.1kPa
15:00 ☾
2.2°C 13°C 15°C - 0% 0.99kPa
16:00 ☾
2.3°C 13°C 14°C - 0% 0.85kPa
17:00 ☾
2.9°C 13°C 11°C - 1% 0.58kPa
18:00 ☾
2.5°C 13°C 7.2°C - 2% 0.29kPa
19:00 ☾
1.6°C 12°C 5.1°C - 1% 0.19kPa
20:00 ☾
0.9°C 12°C 4.5°C - 0% 0.19kPa
21:00 ☾
-0.8°C 11°C 3.9°C - 0% 0.23kPa
22:00 ☾
-3.6°C 9°C 2.9°C - 0% 0.28kPa
23:00 ☾
-6.7°C 6.8°C 1.9°C - 0% 0.33kPa
Sun, Apr 12 Sunrise 05:12 Sunset 18:11
24:00 ☾
-10°C 4.7°C 0.89°C - 0% 0.37kPa
01:00 ☾
-9.8°C 4.7°C 3.2°C - 0% 0.48kPa
02:00 ☾
-9.9°C 4.6°C 5.6°C - 0% 0.62kPa
03:00 ☾
-10°C 4.6°C 7.9°C - 0% 0.79kPa
04:00 ☾
-10°C 4.8°C 8.8°C - 0% 0.85kPa
05:00 ☾
-9.5°C 5°C 9.7°C - 0% 0.9kPa
06:00 ☾
-9.1°C 5.3°C 11°C - 0% 0.96kPa
07:00 ☾
-8.2°C 5.9°C 11°C - 0% 0.97kPa
08:00 ☾
-7.4°C 6.6°C 11°C - 0% 0.97kPa
09:00 ☾
-6.6°C 7.2°C 11°C - 0% 0.97kPa
10:00 ☾
-4.7°C 7.4°C 9.4°C - 33% 0.75kPa
11:00 ☾
-3.6°C 7.5°C 7.5°C - 67% 0.57kPa
12:00 ☾
-3.1°C 7.7°C 5.5°C - 100% 0.42kPa
13:00 ☾
-3.6°C 7.4°C 5.4°C - 100% 0.43kPa
14:00 ☾
-4.2°C 7°C 5.3°C - 100% 0.44kPa
15:00 ☾
-4.7°C 6.7°C 5.1°C - 100% 0.45kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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