Rule Morning Frost

Morning Frost Forecast for Kurjenrahka, Southern Finland

Turku, Southwest Finland, Finland

Kurjenrahka’s raised bog has open sedge flats, dark pools, boardwalk lines, and sparse pines that stand clearly against mist and frost.

Currently

Real-time conditions

Frost Probability

Soil Temperature16.3°C

Dew Point7.3°C (moderate dew point)

Wind Speed4.2m/s (calm conditions)

Cloud Cover5%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (80-hour forecast)

Frost Probability100% of hours
Time Window88% of hours
Wind Speed68% of hours

How this forecast is evaluated

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

Explore Morning Frost conditions across Southern Finland →

Recorded match history

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

Last 30 days

recorded matching windows

Last 90 days

recorded matching windows

Last 365 days

recorded matching windows · 70% average confidence

Only 4 completed matches are recorded in the last 365 days—insufficient history to identify a reliable typical start time or month.

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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80-hour requirements breakdown

When available, the detailed table below covers only the stated 80-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 80 hours

AND logic: all conditions required

Meets requirement

Misses requirement

Time Europe/Helsinki	Time Window Sunrise -45m to +90m	Frost Probability ≥ 60.0%	Wind Speed ≤ 1.5m/s
Tue, Aug 18
07:00	✓	0%	2.1m/s
08:00	✕	0%	2.4m/s
09:00	✕	0%	3.2m/s
10:00	✕	0%	3.5m/s
11:00	✕	0%	3.9m/s
12:00	✕	0%	4.1m/s
13:00	✕	0%	4.3m/s
14:00	✕	0%	4.6m/s
15:00	✕	0%	4.9m/s
16:00	✕	0%	4.6m/s
17:00	✕	0%	4.2m/s
18:00	✕	0%	3.7m/s
19:00	✕	0%	3.6m/s
20:00	✕	0%	3m/s
21:00	✕	0%	2.3m/s
22:00	✕	0%	2.1m/s
23:00	✕	0%	2m/s
Wed, Aug 19
24:00	✕	0%	2.2m/s
01:00	✕	0%	2.2m/s
02:00	✕	0%	1.9m/s
03:00	✕	0%	1.5m/s
04:00	✕	0%	1.3m/s
05:00	✓	0%	1.1m/s
06:00	✓	0%	0.83m/s
07:00	✓	0%	0.68m/s
08:00	✕	0%	0.36m/s
09:00	✕	0%	0.48m/s
10:00	✕	0%	1.3m/s
11:00	✕	0%	2.3m/s
12:00	✕	0%	3.3m/s
13:00	✕	0%	3.9m/s
14:00	✕	0%	4.2m/s
15:00	✕	0%	4.4m/s
16:00	✕	0%	4.6m/s
17:00	✕	0%	4.6m/s
18:00	✕	0%	4.1m/s
19:00	✕	0%	3.5m/s
20:00	✕	0%	2.4m/s
21:00	✕	0%	2.3m/s
22:00	✕	0%	2m/s
23:00	✕	0%	1.5m/s
Thu, Aug 20
24:00	✕	0%	0.89m/s
01:00	✕	0%	0.92m/s
02:00	✕	0%	1.5m/s
03:00	✕	0%	2m/s
04:00	✕	0%	2.1m/s
05:00	✓	0%	2m/s
06:00	✓	0%	1.9m/s
07:00	✓	0%	1.8m/s
08:00	✕	0%	1.6m/s
09:00	✕	0%	0.99m/s
10:00	✕	0%	0.46m/s
11:00	✕	0%	0.73m/s
12:00	✕	0%	1.9m/s
13:00	✕	0%	1.6m/s
14:00	✕	0%	1.5m/s
15:00	✕	0%	1.5m/s
16:00	✕	0%	1.5m/s
17:00	✕	0%	1.8m/s
18:00	✕	0%	1.5m/s
19:00	✕	0%	1.4m/s
20:00	✕	0%	1.4m/s
21:00	✕	0%	1.2m/s
22:00	✕	0%	1.6m/s
23:00	✕	0%	2m/s
Fri, Aug 21
24:00	✕	0%	2.4m/s
01:00	✕	0%	2.5m/s
02:00	✕	0%	2.6m/s
03:00	✕	0%	2.7m/s
04:00	✕	0%	2.9m/s
05:00	✓	0%	3.1m/s
06:00	✓	0%	3.2m/s
07:00	✓	0%	2.7m/s
08:00	✕	0%	2.2m/s
09:00	✕	0%	1.7m/s
10:00	✕	0%	1.5m/s
11:00	✕	0%	1.3m/s
12:00	✕	0%	1.1m/s
13:00	✕	0%	1.2m/s
14:00	✕	0%	1.4m/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 Europe/Helsinki	Dew Point °C	Surface Temperature °C	Temperature °C	Time Window	Total Cloud Coverage %	Vapor Pressure Deficit kPa
Tue, Aug 18 Sunrise 05:50 Sunset 21:17
17:00	7.3°C	16°C	17°C	-	5%	0.94kPa
18:00	7.4°C	16°C	17°C	-	5%	0.87kPa
19:00	7.8°C	16°C	16°C	-	4%	0.78kPa
20:00	8.6°C	16°C	15°C	-	0%	0.62kPa
21:00	8.7°C	16°C	13°C	-	0%	0.4kPa
22:00 ☾	8.4°C	16°C	12°C	-	2%	0.29kPa
23:00 ☾	8.4°C	15°C	11°C	-	5%	0.23kPa
Wed, Aug 19 Sunrise 05:50 Sunset 21:17
24:00 ☾	8.6°C	15°C	11°C	-	5%	0.2kPa
01:00 ☾	8.5°C	14°C	11°C	-	5%	0.18kPa
02:00 ☾	8.4°C	14°C	10°C	-	4%	0.16kPa
03:00 ☾	8.2°C	14°C	9.9°C	-	0%	0.13kPa
04:00 ☾	8.1°C	13°C	9.6°C	-	2%	0.11kPa
05:00 ☾	7.8°C	13°C	9.2°C	-	2%	0.1kPa
06:00	7.8°C	13°C	9.1°C	-	5%	0.1kPa
07:00	7.8°C	12°C	10°C	-	5%	0.17kPa
08:00	8°C	12°C	12°C	-	5%	0.37kPa
09:00	7.9°C	12°C	15°C	-	5%	0.62kPa
10:00	7.3°C	13°C	17°C	-	5%	0.86kPa
11:00	6.7°C	13°C	17°C	-	5%	0.98kPa
12:00	6.5°C	14°C	18°C	-	2%	1kPa
13:00	6.4°C	14°C	18°C	-	0%	1.1kPa
14:00	6.2°C	15°C	18°C	-	0%	1.1kPa
15:00	5.8°C	15°C	18°C	-	2%	1.1kPa
16:00	5.4°C	15°C	17°C	-	0%	1.1kPa
17:00	5.7°C	15°C	17°C	-	0%	1kPa
18:00	5.5°C	16°C	17°C	-	5%	0.98kPa
19:00	5.2°C	16°C	16°C	-	5%	0.93kPa
20:00	6.4°C	15°C	15°C	-	5%	0.72kPa
21:00	6.5°C	15°C	13°C	-	5%	0.49kPa
22:00 ☾	6.1°C	15°C	12°C	-	5%	0.43kPa
23:00 ☾	5.9°C	15°C	11°C	-	5%	0.39kPa
Thu, Aug 20 Sunrise 05:52 Sunset 21:14
24:00 ☾	5.8°C	14°C	10°C	-	32%	0.34kPa
01:00 ☾	5.8°C	14°C	9.9°C	-	45%	0.3kPa
02:00 ☾	5.6°C	13°C	9.4°C	-	43%	0.27kPa
03:00 ☾	5.5°C	13°C	9°C	-	53%	0.25kPa
04:00 ☾	5.2°C	13°C	8.8°C	-	77%	0.25kPa
05:00 ☾	5°C	12°C	9.2°C	-	100%	0.29kPa
06:00	4.9°C	12°C	9.5°C	-	99%	0.32kPa
07:00	5°C	12°C	11°C	-	95%	0.4kPa
08:00	5.3°C	12°C	12°C	-	96%	0.51kPa
09:00	5.8°C	12°C	13°C	-	100%	0.59kPa
10:00	6.9°C	12°C	13°C	-	100%	0.48kPa
11:00	7.5°C	12°C	13°C	-	100%	0.42kPa
12:00	7.6°C	12°C	13°C	-	100%	0.43kPa
13:00	7.9°C	12°C	13°C	-	100%	0.41kPa
14:00	8.2°C	12°C	12°C	-	100%	0.36kPa
15:00	8.9°C	12°C	12°C	-	100%	0.25kPa
16:00	9.3°C	12°C	11°C	-	100%	0.17kPa
17:00	9.5°C	12°C	11°C	-	100%	0.16kPa
18:00	9.4°C	12°C	11°C	-	100%	0.17kPa
19:00	9.4°C	12°C	11°C	-	100%	0.17kPa
20:00	9.3°C	12°C	11°C	-	100%	0.17kPa
21:00	9.1°C	12°C	11°C	-	59%	0.19kPa
22:00 ☾	9.2°C	11°C	11°C	-	41%	0.14kPa
23:00 ☾	9.2°C	11°C	10°C	-	23%	0.09kPa
Fri, Aug 21 Sunrise 05:55 Sunset 21:11
24:00 ☾	9.3°C	10°C	9.9°C	-	5%	0.05kPa
01:00 ☾	10°C	11°C	12°C	-	37%	0.12kPa
02:00 ☾	11°C	11°C	13°C	-	68%	0.19kPa
03:00 ☾	12°C	11°C	15°C	-	100%	0.28kPa
04:00 ☾	12°C	11°C	14°C	-	100%	0.25kPa
05:00 ☾	12°C	11°C	14°C	-	100%	0.21kPa
06:00	12°C	12°C	14°C	-	100%	0.18kPa
07:00	12°C	12°C	14°C	-	99%	0.14kPa
08:00	12°C	12°C	13°C	-	99%	0.09kPa
09:00	13°C	12°C	13°C	-	98%	0.05kPa
10:00	13°C	12°C	14°C	-	75%	0.13kPa
11:00	12°C	12°C	15°C	-	53%	0.21kPa
12:00	12°C	12°C	15°C	-	30%	0.3kPa
13:00	12°C	12°C	14°C	-	20%	0.21kPa
14:00	12°C	13°C	13°C	-	10%	0.14kPa
15:00	11°C	13°C	12°C	-	0%	0.07kPa
16:00	11°C	13°C	12°C	-	0%	0.06kPa

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 18, 2026, 1:27 PM UTC

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