Rule Morning Frost

Morning Frost Forecast for Nikko, Japan

Nikkō, Tochigi, Japan

Nikko combines the carved buildings of Toshogu with cedar avenues, stone lanterns, waterfalls, and steep forested gorges for layered frames.

Currently

Real-time conditions

Frost Probability

Soil Temperature18.0°C

Dew Point14.0°C (moderate dew point)

Wind Speed1.3m/s (calm conditions)

Cloud Cover54%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Tokyo

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (95-hour forecast)

Time Window100% of hours
Frost Probability100% of hours
Wind Speed57% of hours

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Morning Frost conditions across Japan. The requirements and hourly values below show how those signals apply at Nikko.

Explore Morning Frost conditions across Japan →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Nikko during the last 365 days.

Last 30 days

recorded matching windows

Last 90 days

recorded matching windows

Last 365 days

recorded matching windows · 61% average confidence

Most frequent recorded start hour

07:00 local time, shared by 5 of 10 matches recorded in the last 365 days.

Most represented month

February, with 7 of 10 matches recorded in the last 365 days.

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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95-hour requirements breakdown

When available, the detailed table below covers only the stated 95-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

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
Sat, Aug 22
04:00	✕	0%	1.5m/s
05:00	✕	0%	1.5m/s
06:00	✕	0%	1.2m/s
07:00	✕	0%	0.3m/s
08:00	✕	0%	0.69m/s
09:00	✕	0%	0.86m/s
10:00	✕	0%	1.1m/s
11:00	✕	0%	1.1m/s
12:00	✕	0%	1.2m/s
13:00	✕	0%	1m/s
14:00	✕	0%	0.77m/s
15:00	✕	0%	0.43m/s
16:00	✕	0%	0.48m/s
17:00	✕	0%	0.62m/s
18:00	✕	0%	0.6m/s
19:00	✕	0%	1.6m/s
20:00	✕	0%	1m/s
21:00	✕	0%	1.3m/s
22:00	✕	0%	0.96m/s
23:00	✕	0%	0.69m/s
Sun, Aug 23
24:00	✕	0%	1.3m/s
01:00	✕	0%	0.81m/s
02:00	✕	0%	1m/s
03:00	✕	0%	1.2m/s
04:00	✕	0%	1.3m/s
05:00	✕	0%	1.3m/s
06:00	✕	0%	1.1m/s
07:00	✕	0%	0.47m/s
08:00	✕	0%	1.1m/s
09:00	✕	0%	1.5m/s
10:00	✕	0%	1.7m/s
11:00	✕	0%	1.4m/s
12:00	✕	0%	0.72m/s
13:00	✕	0%	0.58m/s
14:00	✕	0%	0.64m/s
15:00	✕	0%	0.67m/s
16:00	✕	0%	0.63m/s
17:00	✕	0%	0.96m/s
18:00	✕	0%	0.98m/s
19:00	✕	0%	1m/s
20:00	✕	0%	1.4m/s
21:00	✕	0%	1.6m/s
22:00	✕	0%	1.7m/s
23:00	✕	0%	1.9m/s
Mon, Aug 24
24:00	✕	0%	2m/s
01:00	✕	0%	2m/s
02:00	✕	0%	1.6m/s
03:00	✕	0%	1.8m/s
04:00	✕	0%	2m/s
05:00	✕	0%	1.8m/s
06:00	✕	0%	1.4m/s
07:00	✕	0%	0.37m/s
08:00	✕	0%	0.46m/s
09:00	✕	0%	1m/s
10:00	✕	0%	2m/s
11:00	✕	0%	2.3m/s
12:00	✕	0%	2.5m/s
13:00	✕	0%	2.3m/s
14:00	✕	0%	2.1m/s
15:00	✕	0%	2m/s
16:00	✕	0%	1.5m/s
17:00	✕	0%	1.3m/s
18:00	✕	0%	1.4m/s
19:00	✕	0%	1.7m/s
20:00	✕	0%	2m/s
21:00	✕	0%	2.2m/s
22:00	✕	0%	2.2m/s
23:00	✕	0%	2.1m/s
Tue, Aug 25
24:00	✕	0%	2.1m/s
01:00	✕	0%	2.4m/s
02:00	✕	0%	2.3m/s
03:00	✕	0%	2.4m/s
04:00	✕	0%	2.3m/s
05:00	✕	0%	2.3m/s
06:00	✕	0%	2.2m/s
07:00	✕	0%	0.84m/s
08:00	✕	0%	0.45m/s
09:00	✕	0%	1.3m/s
10:00	✕	0%	1m/s
11:00	✕	0%	0.73m/s
12:00	✕	0%	0.46m/s
13:00	✕	0%	0.97m/s
14:00	✕	0%	1.5m/s
15:00	✕	0%	2m/s
16:00	✕	0%	2m/s
17:00	✕	0%	1.9m/s
18:00	✕	0%	1.9m/s
19:00	✕	0%	2m/s
20:00	✕	0%	2.1m/s
21:00	✕	0%	2.2m/s
22:00	✕	0%	2.2m/s
23:00	✕	0%	2.2m/s
Wed, Aug 26
24:00	✕	0%	2.2m/s
01:00	✕	0%	2m/s
02:00	✕	0%	1.9m/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
Sun, Aug 23 Sunrise 05:04 Sunset 18:24
05:00 ☾	14°C	18°C	16°C	-	54%	0.17kPa
06:00 ☾	15°C	18°C	17°C	-	63%	0.21kPa
07:00 ☾	16°C	18°C	19°C	-	94%	0.33kPa
08:00 ☾	17°C	18°C	20°C	-	100%	0.41kPa
09:00	18°C	18°C	21°C	-	100%	0.5kPa
10:00	18°C	18°C	22°C	-	100%	0.54kPa
11:00	19°C	18°C	20°C	-	100%	0.23kPa
12:00	19°C	18°C	21°C	-	100%	0.25kPa
13:00	19°C	19°C	20°C	-	100%	0.15kPa
14:00	19°C	19°C	21°C	-	100%	0.26kPa
15:00	19°C	19°C	20°C	-	100%	0.23kPa
16:00	19°C	19°C	20°C	-	100%	0.19kPa
17:00	19°C	19°C	20°C	-	92%	0.14kPa
18:00	18°C	19°C	19°C	-	99%	0.03kPa
19:00 ☾	18°C	19°C	18°C	-	76%	0.01kPa
20:00 ☾	18°C	19°C	18°C	-	81%	0.01kPa
21:00 ☾	18°C	19°C	18°C	-	70%	0.02kPa
22:00 ☾	17°C	19°C	18°C	-	70%	0.05kPa
23:00 ☾	17°C	19°C	18°C	-	36%	0.07kPa
Mon, Aug 24 Sunrise 05:05 Sunset 18:22
24:00 ☾	16°C	19°C	17°C	-	46%	0.08kPa
01:00 ☾	17°C	18°C	17°C	-	92%	0.07kPa
02:00 ☾	17°C	18°C	17°C	-	44%	0.09kPa
03:00 ☾	16°C	18°C	17°C	-	10%	0.08kPa
04:00 ☾	16°C	18°C	16°C	-	3%	0.09kPa
05:00 ☾	15°C	18°C	16°C	-	0%	0.14kPa
06:00 ☾	16°C	18°C	17°C	-	0%	0.21kPa
07:00 ☾	17°C	18°C	20°C	-	0%	0.39kPa
08:00 ☾	18°C	18°C	22°C	-	0%	0.61kPa
09:00	17°C	18°C	24°C	-	6%	0.97kPa
10:00	18°C	19°C	25°C	-	45%	1.2kPa
11:00	19°C	19°C	25°C	-	44%	0.96kPa
12:00	19°C	19°C	24°C	-	54%	0.82kPa
13:00	19°C	19°C	23°C	-	49%	0.63kPa
14:00	20°C	20°C	23°C	-	42%	0.48kPa
15:00	20°C	20°C	23°C	-	27%	0.47kPa
16:00	20°C	20°C	23°C	-	19%	0.48kPa
17:00	20°C	20°C	22°C	-	2%	0.27kPa
18:00	19°C	20°C	20°C	-	3%	0.2kPa
19:00 ☾	18°C	20°C	19°C	-	3%	0.16kPa
20:00 ☾	17°C	20°C	18°C	-	1%	0.14kPa
21:00 ☾	17°C	20°C	18°C	-	0%	0.14kPa
22:00 ☾	17°C	20°C	18°C	-	3%	0.15kPa
23:00 ☾	17°C	19°C	18°C	-	4%	0.16kPa
Tue, Aug 25 Sunrise 05:05 Sunset 18:21
24:00 ☾	16°C	19°C	18°C	-	4%	0.18kPa
01:00 ☾	16°C	19°C	18°C	-	3%	0.21kPa
02:00 ☾	15°C	19°C	17°C	-	0%	0.24kPa
03:00 ☾	15°C	19°C	17°C	-	4%	0.27kPa
04:00 ☾	15°C	19°C	17°C	-	37%	0.29kPa
05:00 ☾	14°C	19°C	17°C	-	17%	0.3kPa
06:00 ☾	15°C	19°C	18°C	-	19%	0.33kPa
07:00 ☾	17°C	19°C	21°C	-	4%	0.59kPa
08:00 ☾	17°C	19°C	23°C	-	0%	0.95kPa
09:00	17°C	19°C	25°C	-	0%	1.3kPa
10:00	18°C	19°C	23°C	-	33%	0.88kPa
11:00	18°C	20°C	22°C	-	67%	0.52kPa
12:00	19°C	20°C	20°C	-	100%	0.22kPa
13:00	18°C	20°C	19°C	-	68%	0.17kPa
14:00	18°C	20°C	19°C	-	36%	0.13kPa
15:00	17°C	19°C	18°C	-	4%	0.1kPa
16:00	17°C	19°C	18°C	-	4%	0.09kPa
17:00	17°C	19°C	17°C	-	4%	0.08kPa
18:00	17°C	19°C	17°C	-	5%	0.08kPa
19:00 ☾	17°C	19°C	17°C	-	4%	0.08kPa
20:00 ☾	16°C	19°C	17°C	-	2%	0.07kPa
21:00 ☾	16°C	19°C	17°C	-	1%	0.07kPa
22:00 ☾	17°C	19°C	17°C	-	6%	0.07kPa
23:00 ☾	17°C	19°C	17°C	-	11%	0.06kPa
Wed, Aug 26 Sunrise 05:06 Sunset 18:20
24:00 ☾	17°C	18°C	18°C	-	16%	0.06kPa
01:00 ☾	18°C	19°C	19°C	-	44%	0.26kPa
02:00 ☾	18°C	19°C	21°C	-	71%	0.5kPa
03:00 ☾	18°C	19°C	23°C	-	98%	0.8kPa
04:00 ☾	18°C	19°C	24°C	-	99%	0.94kPa

How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

How opportunities work → Weather data sources →

Forecast generated

Aug 22, 2026, 7:01 PM UTC

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