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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 94% failing
Time Window 88% failing
Frost Probability 50% failing

Currently

Real-time conditions
Frost Probability
44%
Soil Temperature-1.6°C
Dew Point2.6°C (low dew point)
Wind Speed6.7m/s (moderate winds)
Cloud Cover95%

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
Sun, Feb 22
04:00✕59%3.3m/s
05:00✓63%3.2m/s
06:00✓67%3.2m/s
07:00✓67%3.3m/s
08:00✕67%3m/s
09:00✕52%3m/s
10:00✕48%3m/s
11:00✕48%3m/s
12:00✕48%3.1m/s
13:00✕48%3.3m/s
14:00✕48%3.3m/s
15:00✕48%3.4m/s
16:00✕48%3.5m/s
17:00✕55%3.9m/s
18:00✕63%4m/s
19:00✕63%4m/s
20:00✕63%4m/s
21:00✕53%4.6m/s
22:00✕50%4.8m/s
23:00✕65%5.5m/s
Mon, Feb 23
24:00✕55%6m/s
01:00✕45%6.4m/s
02:00✕45%7.2m/s
03:00✕44%6.7m/s
04:00✕44%6.7m/s
05:00✓44%7m/s
06:00✓44%6.6m/s
07:00✓44%7.9m/s
08:00✕51%7.4m/s
09:00✕52%8.2m/s
10:00✕59%7.8m/s
11:00✕59%7.7m/s
12:00✕60%7.2m/s
13:00✕59%6.3m/s
14:00✕58%5.2m/s
15:00✕61%5.1m/s
16:00✕61%4.3m/s
17:00✕54%2.8m/s
18:00✕53%3.9m/s
19:00✕71%1.7m/s
20:00✕52%3.9m/s
21:00✕69%4.4m/s
22:00✕59%4.1m/s
23:00✕63%4.2m/s
Tue, Feb 24
24:00✕59%4m/s
01:00✕50%2m/s
02:00✕54%2.8m/s
03:00✕52%3.8m/s
04:00✕61%2m/s
05:00✓54%2.2m/s
06:00✓52%3.1m/s
07:00✓54%2.7m/s
08:00✕63%2.9m/s
09:00✕63%3.5m/s
10:00✕61%4.4m/s
11:00✕65%4.5m/s
12:00✕65%4.4m/s
13:00✕65%4.4m/s
14:00✕65%4.6m/s
15:00✕63%3.9m/s
16:00✕65%1.8m/s
17:00✕66%0.53m/s
18:00✕64%1.6m/s
19:00✕62%1.8m/s
20:00✕62%2.1m/s
21:00✕54%2m/s
22:00✕54%1.9m/s
23:00✕54%1.8m/s
Wed, Feb 25
24:00✕54%1.8m/s
01:00✕54%2.1m/s
02:00✕54%1.9m/s
03:00✕55%1.8m/s
04:00✕55%2m/s
05:00✓69%2m/s
06:00✓69%2.3m/s
07:00✓69%2.2m/s
08:00✕81%0.66m/s
09:00✕82%0.92m/s
10:00✕79%1.3m/s
11:00✕71%1.6m/s
12:00✕71%2m/s
13:00✕61%2.1m/s
14:00✕55%2.2m/s
15:00✕54%2.3m/s
16:00✕57%2.3m/s
17:00✕63%2.2m/s
18:00✕71%2.1m/s
19:00✕71%2.2m/s
20:00✕71%2.3m/s
21:00✕71%2.3m/s
22:00✕63%2.2m/s
23:00✕57%2.1m/s
Thu, Feb 26
24:00✕56%2m/s
01:00✕56%2.4m/s
02:00✕62%2.8m/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
Mon, Feb 23 Sunrise 06:17 Sunset 17:08
04:00 ☾
2.6°C -1.6°C 2.7°C - 95% 0kPa
05:00 ☾
3.2°C -1.5°C 3.5°C - 100% 0.02kPa
06:00 ☾
3.9°C -1.5°C 4°C - 100% 0kPa
07:00 ☾
1.3°C -1.5°C 1.7°C - 100% 0.02kPa
08:00 ☾
-1.4°C -1.5°C 1.1°C - 100% 0.11kPa
09:00 ☾
-2.9°C -1.5°C -0.05°C - 65% 0.11kPa
10:00 ☾
-4.5°C -1.5°C -0.57°C - 99% 0.15kPa
11:00 ☾
-5°C -1.5°C -1.3°C - 100% 0.13kPa
12:00 ☾
-5.9°C -1.4°C -2.2°C - 74% 0.13kPa
13:00 ☾
-6.9°C -1.4°C -2.6°C - 84% 0.14kPa
14:00 ☾
-6°C -1.4°C -2.8°C - 93% 0.1kPa
15:00 ☾
-6.3°C -1.4°C -2.8°C - 89% 0.12kPa
16:00 ☾
-6.4°C -1.3°C -3°C - 87% 0.11kPa
17:00 ☾
-6.3°C -1.3°C -5°C - 100% 0.04kPa
18:00 ☾
-5.7°C -1.3°C -4°C - 65% 0.06kPa
19:00 ☾
-7.4°C -1.3°C -5.4°C - 6% 0.06kPa
20:00 ☾
-8.4°C -1.3°C -6.6°C - 100% 0.05kPa
21:00 ☾
-9.6°C -1.3°C -6°C - 13% 0.1kPa
22:00 ☾
-9.6°C -1.3°C -7.2°C - 33% 0.06kPa
23:00 ☾
-8.1°C -1.3°C -5.9°C - 17% 0.06kPa
Tue, Feb 24 Sunrise 06:15 Sunset 17:10
24:00 ☾
-7.3°C -1.3°C -5.9°C - 34% 0.04kPa
01:00 ☾
-7.7°C -1.3°C -7.4°C - 100% 0.01kPa
02:00 ☾
-6.6°C -1.4°C -5.5°C - 100% 0.03kPa
03:00 ☾
-8.2°C -1.4°C -5.9°C - 95% 0.07kPa
04:00 ☾
-9.8°C -1.4°C -7°C - 30% 0.07kPa
05:00 ☾
-12°C -1.4°C -9.6°C - 87% 0.05kPa
06:00 ☾
-10°C -1.4°C -7.5°C - 91% 0.07kPa
07:00 ☾
-11°C -1.4°C -8.4°C - 100% 0.06kPa
08:00 ☾
-9.8°C -1.5°C -5.7°C - 83% 0.11kPa
09:00 ☾
-10°C -1.5°C -4.3°C - 100% 0.16kPa
10:00 ☾
-9.5°C -1.5°C -3.6°C - 100% 0.17kPa
11:00 ☾
-9.3°C -1.5°C -3.3°C - 100% 0.18kPa
12:00 ☾
-9.3°C -1.5°C -3.1°C - 100% 0.18kPa
13:00 ☾
-9.2°C -1.5°C -2.6°C - 100% 0.2kPa
14:00 ☾
-8.9°C -1.5°C -2.4°C - 100% 0.2kPa
15:00 ☾
-8.5°C -1.5°C -2.7°C - 100% 0.18kPa
16:00 ☾
-7.6°C -1.5°C -3.3°C - 100% 0.13kPa
17:00 ☾
-9.2°C -1.5°C -5.8°C - 100% 0.09kPa
18:00 ☾
-9.6°C -1.5°C -6.5°C - 100% 0.08kPa
19:00 ☾
-9.9°C -1.5°C -6.7°C - 100% 0.08kPa
20:00 ☾
-10°C -1.5°C -7.2°C - 100% 0.08kPa
21:00 ☾
-10°C -1.5°C -7.2°C - 100% 0.07kPa
22:00 ☾
-10°C -1.5°C -7.4°C - 100% 0.07kPa
23:00 ☾
-10°C -1.6°C -7.8°C - 100% 0.06kPa
Wed, Feb 25 Sunrise 06:14 Sunset 17:11
24:00 ☾
-10°C -1.6°C -7.9°C - 100% 0.05kPa
01:00 ☾
-10°C -1.6°C -8.2°C - 100% 0.05kPa
02:00 ☾
-11°C -1.6°C -8.6°C - 100% 0.05kPa
03:00 ☾
-11°C -1.6°C -9.3°C - 73% 0.05kPa
04:00 ☾
-13°C -1.6°C -10°C - 73% 0.04kPa
05:00 ☾
-13°C -1.7°C -11°C - 2% 0.04kPa
06:00 ☾
-14°C -1.7°C -12°C - 5% 0.04kPa
07:00 ☾
-12°C -1.8°C -10°C - 2% 0.05kPa
08:00 ☾
-9.2°C -1.8°C -5.4°C - 0% 0.1kPa
09:00 ☾
-8.3°C -1.8°C -3.6°C - 0% 0.14kPa
10:00 ☾
-9°C -1.9°C -5.4°C - 2% 0.1kPa
11:00 ☾
-9.8°C -1.9°C -7.1°C - 3% 0.07kPa
12:00 ☾
-11°C -2°C -8.8°C - 4% 0.04kPa
13:00 ☾
-11°C -2°C -9.4°C - 36% 0.05kPa
14:00 ☾
-12°C -2°C -10°C - 68% 0.05kPa
15:00 ☾
-13°C -1.9°C -11°C - 100% 0.05kPa
16:00 ☾
-13°C -2°C -11°C - 68% 0.05kPa
17:00 ☾
-13°C -2.1°C -11°C - 37% 0.05kPa
18:00 ☾
-14°C -2.2°C -11°C - 5% 0.06kPa
19:00 ☾
-13°C -2.3°C -10°C - 5% 0.05kPa
20:00 ☾
-12°C -2.4°C -9.9°C - 5% 0.05kPa
21:00 ☾
-11°C -2.5°C -9.5°C - 5% 0.04kPa
22:00 ☾
-11°C -2.5°C -9°C - 37% 0.05kPa
23:00 ☾
-11°C -2.6°C -8.5°C - 68% 0.05kPa
Thu, Feb 26 Sunrise 06:12 Sunset 17:12
24:00 ☾
-10°C -2.6°C -8°C - 100% 0.05kPa
01:00 ☾
-8.7°C -2.7°C -6°C - 100% 0.07kPa
02:00 ☾
-7.2°C -2.7°C -3.9°C - 100% 0.1kPa
03:00 ☾
-5.7°C -2.7°C -1.9°C - 100% 0.13kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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