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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 75% failing

Currently

Real-time conditions
Frost Probability
26%
Soil Temperature5.4°C
Dew Point-6.2°C (low dew point)
Wind Speed2.3m/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 92 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 14
13:00✕36%5m/s
14:00✕3.2%4.8m/s
15:00✕3.9%4.4m/s
16:00✕4.5%3.7m/s
17:00✕4.9%2.7m/s
18:00✕5%1.4m/s
19:00✕52%0.8m/s
20:00✕50%1.1m/s
21:00✕45%1.7m/s
22:00✕41%1.5m/s
23:00✕45%1.6m/s
Wed, Apr 15
24:00✕45%1.5m/s
01:00✕45%1.5m/s
02:00✕54%1.6m/s
03:00✕42%1.6m/s
04:00✕48%1.5m/s
05:00✕41%1.7m/s
06:00✕42%1.2m/s
07:00✕43%0.58m/s
08:00✕39%0.2m/s
09:00✕45%0.95m/s
10:00✕30%1.3m/s
11:00✕26%2.3m/s
12:00✕2.3%2.4m/s
13:00✕2.3%2.7m/s
14:00✕0%2.5m/s
15:00✕0%2.7m/s
16:00✕0%2.4m/s
17:00✕0%1.3m/s
18:00✕3.8%1.2m/s
19:00✕4%0.43m/s
20:00✕3.4%1.3m/s
21:00✕3.2%2.1m/s
22:00✕2.7%1.9m/s
23:00✕22%1.2m/s
Thu, Apr 16
24:00✕24%0.67m/s
01:00✕24%0.17m/s
02:00✕21%0.77m/s
03:00✕26%1m/s
04:00✕28%1.2m/s
05:00✕32%0.86m/s
06:00✕37%0.75m/s
07:00✕43%0.95m/s
08:00✕44%0.77m/s
09:00✕42%1.6m/s
10:00✕4.9%2.6m/s
11:00✕4.5%2.9m/s
12:00✕0%3.1m/s
13:00✕0%3.6m/s
14:00✕0%4.2m/s
15:00✕0%4.3m/s
16:00✕0%3.8m/s
17:00✕0%2.7m/s
18:00✕0%1.4m/s
19:00✕0%1.3m/s
20:00✕0%1.7m/s
21:00✕3.2%2.3m/s
22:00✕3%2.9m/s
23:00✕2.7%2.8m/s
Fri, Apr 17
24:00✕35%2.7m/s
01:00✕41%2.9m/s
02:00✕22%3m/s
03:00✕24%2.7m/s
04:00✕20%2.9m/s
05:00✕30%2.7m/s
06:00✕30%2.7m/s
07:00✕37%3.7m/s
08:00✕33%3.6m/s
09:00✕33%3.9m/s
10:00✕2.7%3.9m/s
11:00✕2.5%4.1m/s
12:00✕2.5%4.1m/s
13:00✕0%4.3m/s
14:00✕0%4.2m/s
15:00✕0%3.8m/s
16:00✕0%3.4m/s
17:00✕3.2%3.1m/s
18:00✕3.2%2.8m/s
19:00✕3.4%2.8m/s
20:00✕3.4%2.7m/s
21:00✕35%2.7m/s
22:00✕35%2.8m/s
23:00✕33%2.8m/s
Sat, Apr 18
24:00✕33%2.8m/s
01:00✕33%3.3m/s
02:00✕33%3.8m/s
03:00✕3%4.2m/s
04:00✕3.2%4m/s
05:00✕3%3.7m/s
06:00✕1.7%3.4m/s
07:00✕3%3.4m/s
08:00✕0%3.5m/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 15 Sunrise 04:48 Sunset 18:12
11:00
-6.2°C 5.4°C 9.5°C - 100% 0.8kPa
12:00
-5.8°C 6.7°C 9.9°C - 100% 0.82kPa
13:00
-5.3°C 7.8°C 10°C - 100% 0.83kPa
14:00
-5.1°C 8.4°C 10°C - 100% 0.81kPa
15:00
-4.3°C 8.4°C 9.1°C - 100% 0.71kPa
16:00
-3.1°C 8.4°C 8.1°C - 100% 0.59kPa
17:00
-1.8°C 8.1°C 7.3°C - 100% 0.48kPa
18:00
-0.8°C 7.7°C 6.6°C - 100% 0.4kPa
19:00 ☾
-0.5°C 7.3°C 6.2°C - 100% 0.36kPa
20:00 ☾
-0.1°C 7°C 5.8°C - 100% 0.32kPa
21:00 ☾
0.5°C 6.6°C 4.6°C - 100% 0.22kPa
22:00 ☾
0.8°C 6.2°C 3.9°C - 100% 0.16kPa
23:00 ☾
0.9°C 5.8°C 3.6°C - 100% 0.14kPa
Thu, Apr 16 Sunrise 04:48 Sunset 18:12
24:00 ☾
1.2°C 5.3°C 3.5°C - 100% 0.12kPa
01:00 ☾
1.1°C 5°C 3.2°C - 100% 0.11kPa
02:00 ☾
0.7°C 4.7°C 2.6°C - 100% 0.1kPa
03:00 ☾
0°C 4.4°C 2.1°C - 33% 0.1kPa
04:00 ☾
-0.9°C 3.9°C 1.1°C - 34% 0.09kPa
05:00 ☾
-1.2°C 3.7°C 0.79°C - 19% 0.09kPa
06:00 ☾
-1.3°C 3.4°C 1.6°C - 24% 0.13kPa
07:00 ☾
-1°C 3.4°C 2.8°C - 24% 0.18kPa
08:00 ☾
-0.4°C 4.2°C 4.2°C - 39% 0.23kPa
09:00
-0.2°C 5.2°C 5.6°C - 27% 0.3kPa
10:00
-0.7°C 6.2°C 6.9°C - 8% 0.41kPa
11:00
-2.2°C 7.4°C 8.1°C - 3% 0.56kPa
12:00
-4.5°C 8.5°C 9.6°C - 0% 0.75kPa
13:00
-6.3°C 9.5°C 10°C - 0% 0.89kPa
14:00
-6.9°C 10°C 11°C - 0% 0.94kPa
15:00
-7.2°C 11°C 11°C - 4% 0.94kPa
16:00
-7.2°C 11°C 10°C - 0% 0.9kPa
17:00
-5.4°C 10°C 9.4°C - 2% 0.77kPa
18:00
-4.1°C 9.7°C 7.2°C - 14% 0.56kPa
19:00 ☾
-4.4°C 9°C 6°C - 5% 0.49kPa
20:00 ☾
-2.9°C 8.1°C 5.3°C - 7% 0.39kPa
21:00 ☾
-1.3°C 7.4°C 4.5°C - 100% 0.28kPa
22:00 ☾
-0.4°C 6.8°C 3.9°C - 100% 0.21kPa
23:00 ☾
-0.2°C 6.2°C 3.3°C - 100% 0.17kPa
Fri, Apr 17 Sunrise 04:47 Sunset 18:13
24:00 ☾
-0.4°C 5.7°C 3°C - 28% 0.17kPa
01:00 ☾
-1°C 5.1°C 2.2°C - 5% 0.15kPa
02:00 ☾
-1.1°C 4.6°C 1.8°C - 58% 0.13kPa
03:00 ☾
-1.2°C 4.1°C 1.6°C - 51% 0.13kPa
04:00 ☾
-1.3°C 3.6°C 1.6°C - 93% 0.13kPa
05:00 ☾
-1.3°C 3.3°C 2.1°C - 100% 0.15kPa
06:00 ☾
-1°C 3.2°C 3°C - 100% 0.19kPa
07:00 ☾
-1.2°C 3.4°C 4.9°C - 100% 0.31kPa
08:00 ☾
-1.2°C 4.1°C 7.1°C - 100% 0.44kPa
09:00
-0.8°C 5°C 8.5°C - 94% 0.53kPa
10:00
-1.3°C 6.1°C 10°C - 100% 0.7kPa
11:00
-2.2°C 7.1°C 11°C - 100% 0.81kPa
12:00
-2.7°C 8°C 12°C - 100% 0.88kPa
13:00
-2.6°C 8.9°C 12°C - 100% 0.92kPa
14:00
-2.5°C 9.5°C 12°C - 100% 0.92kPa
15:00
-2.2°C 9.9°C 12°C - 100% 0.88kPa
16:00
-2°C 8.9°C 10°C - 100% 0.69kPa
17:00
-2.1°C 7.9°C 7.9°C - 100% 0.54kPa
18:00
-2.4°C 6.9°C 5.8°C - 100% 0.41kPa
19:00 ☾
-2.8°C 6.6°C 5.9°C - 100% 0.43kPa
20:00 ☾
-3.2°C 6.3°C 5.9°C - 100% 0.45kPa
21:00 ☾
-3.6°C 6°C 6°C - 100% 0.46kPa
22:00 ☾
-3.2°C 5.8°C 6.2°C - 100% 0.47kPa
23:00 ☾
-2.9°C 5.5°C 6.5°C - 100% 0.47kPa
Sat, Apr 18 Sunrise 04:45 Sunset 18:15
24:00 ☾
-2.6°C 5.3°C 6.7°C - 100% 0.47kPa
01:00 ☾
-1.4°C 5.7°C 7.7°C - 100% 0.5kPa
02:00 ☾
-0.2°C 6°C 8.7°C - 100% 0.52kPa
03:00 ☾
1°C 6.3°C 9.7°C - 100% 0.55kPa
04:00 ☾
2.3°C 6.5°C 8.8°C - 100% 0.41kPa
05:00 ☾
3.4°C 6.6°C 7.8°C - 99% 0.28kPa
06:00 ☾
4.2°C 6.8°C 6.8°C - 99% 0.17kPa
07:00 ☾
4.3°C 7.4°C 8.3°C - 84% 0.26kPa
08:00 ☾
4.4°C 8.1°C 9.7°C - 70% 0.37kPa
09:00
4.3°C 8.8°C 11°C - 55% 0.5kPa
10:00
4.7°C 8.7°C 10°C - 55% 0.38kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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