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Rule Morning Frost

Morning Frost Forecast for Helsinki, Southern Finland

Helsingfors, Uusimaa, Finland

Granite shores, low Baltic islands, Suomenlinna’s fortifications, and neoclassical waterfront buildings give Helsinki varied maritime foregrounds.

Currently

Real-time conditions
Frost Probability
0%
Soil Temperature13.8°C
Dew Point10.7°C (moderate dew point)
Wind Speed4.9m/s (calm conditions)
Cloud Cover100%

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 (95-hour forecast)

  • Frost Probability100% of hours
  • Wind Speed93% of hours
  • Time Window88% 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 Helsinki.

Explore Morning Frost conditions across Southern Finland →

Recorded match history

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

Last 30 days
0
recorded matching windows
Last 90 days
0
recorded matching windows
Last 365 days
4
recorded matching windows · 85% 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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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
Europe/Helsinki
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Sat, Aug 22
22:00✕0%8.2m/s
23:00✕0%8.2m/s
Sun, Aug 23
24:00✕0%8m/s
01:00✕0%7.9m/s
02:00✕0%7.5m/s
03:00✕0%6.7m/s
04:00✕0%6.7m/s
05:00✓0%6.7m/s
06:00✓0%7m/s
07:00✓0%6.4m/s
08:00✕0%6.8m/s
09:00✕0%6.2m/s
10:00✕0%6.6m/s
11:00✕0%6.2m/s
12:00✕0%6.2m/s
13:00✕0%6.3m/s
14:00✕0%6.4m/s
15:00✕0%6.4m/s
16:00✕0%6.2m/s
17:00✕0%6.3m/s
18:00✕0%5.8m/s
19:00✕0%5.5m/s
20:00✕0%5.4m/s
21:00✕0%5.1m/s
22:00✕0%4.8m/s
23:00✕0%4.9m/s
Mon, Aug 24
24:00✕0%5m/s
01:00✕0%4.9m/s
02:00✕0%4.7m/s
03:00✕0%4.7m/s
04:00✕0%4.6m/s
05:00✓0%4.5m/s
06:00✓0%4.5m/s
07:00✓0%4.4m/s
08:00✕0%4.7m/s
09:00✕0%4.9m/s
10:00✕0%5.2m/s
11:00✕0%5m/s
12:00✕0%4.8m/s
13:00✕0%4.6m/s
14:00✕0%4.4m/s
15:00✕0%4.3m/s
16:00✕0%4.2m/s
17:00✕0%3.7m/s
18:00✕0%3m/s
19:00✕0%3.3m/s
20:00✕0%3m/s
21:00✕0%2.7m/s
22:00✕0%2.8m/s
23:00✕0%3.2m/s
Tue, Aug 25
24:00✕0%3.5m/s
01:00✕0%3.1m/s
02:00✕0%3m/s
03:00✕0%3.1m/s
04:00✕0%3.1m/s
05:00✓0%3.4m/s
06:00✓0%3.4m/s
07:00✓0%3.8m/s
08:00✕0%3.5m/s
09:00✕0%4m/s
10:00✕0%4.3m/s
11:00✕0%4.4m/s
12:00✕0%4.5m/s
13:00✕0%4.2m/s
14:00✕0%4m/s
15:00✕0%3.8m/s
16:00✕0%3.4m/s
17:00✕0%3m/s
18:00✕0%2.1m/s
19:00✕0%1.6m/s
20:00✕0%1.9m/s
21:00✕0%2.2m/s
22:00✕0%2.3m/s
23:00✕0%2.3m/s
Wed, Aug 26
24:00✕0%2.3m/s
01:00✕0%2.4m/s
02:00✕0%2.3m/s
03:00✕0%2.2m/s
04:00✕0%1.9m/s
05:00✓0%1.7m/s
06:00✓0%1.5m/s
07:00✓0%1.3m/s
08:00✕0%1.2m/s
09:00✕0%1m/s
10:00✕0%1.4m/s
11:00✕0%1.8m/s
12:00✕0%2.2m/s
13:00✕0%2.2m/s
14:00✕0%2.1m/s
15:00✕0%2.1m/s
16:00✕0%2.1m/s
17:00✕0%2m/s
18:00✕0%2m/s
19:00✕0%2.2m/s
20:00✕0%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
Europe/Helsinki
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sun, Aug 23 Sunrise 05:53 Sunset 20:50
23:00 ☾
11°C 14°C 15°C - 100% 0.38kPa
Mon, Aug 24 Sunrise 05:53 Sunset 20:50
24:00 ☾
11°C 14°C 14°C - 100% 0.32kPa
01:00 ☾
11°C 14°C 14°C - 94% 0.26kPa
02:00 ☾
11°C 14°C 13°C - 82% 0.18kPa
03:00 ☾
11°C 13°C 13°C - 100% 0.16kPa
04:00 ☾
11°C 13°C 13°C - 100% 0.14kPa
05:00 ☾
11°C 13°C 12°C - 95% 0.11kPa
06:00
11°C 13°C 12°C - 99% 0.08kPa
07:00
11°C 13°C 12°C - 69% 0.1kPa
08:00
11°C 13°C 13°C - 77% 0.2kPa
09:00
11°C 13°C 14°C - 63% 0.34kPa
10:00
11°C 13°C 16°C - 62% 0.5kPa
11:00
10°C 13°C 17°C - 78% 0.65kPa
12:00
10°C 14°C 18°C - 100% 0.77kPa
13:00
10°C 14°C 18°C - 100% 0.82kPa
14:00
9.8°C 14°C 18°C - 66% 0.88kPa
15:00
9.6°C 15°C 19°C - 37% 0.96kPa
16:00
9.7°C 15°C 19°C - 45% 0.95kPa
17:00
9.4°C 15°C 19°C - 82% 0.98kPa
18:00
10°C 15°C 18°C - 42% 0.86kPa
19:00
11°C 15°C 17°C - 96% 0.61kPa
20:00
11°C 15°C 16°C - 54% 0.49kPa
21:00 ☾
11°C 15°C 14°C - 100% 0.27kPa
22:00 ☾
10°C 15°C 13°C - 72% 0.22kPa
23:00 ☾
10°C 15°C 12°C - 55% 0.2kPa
Tue, Aug 25 Sunrise 05:55 Sunset 20:48
24:00 ☾
9.7°C 14°C 12°C - 13% 0.2kPa
01:00 ☾
9.5°C 14°C 11°C - 5% 0.16kPa
02:00 ☾
9.4°C 14°C 11°C - 6% 0.13kPa
03:00 ☾
9.5°C 14°C 11°C - 12% 0.1kPa
04:00 ☾
9.6°C 13°C 10°C - 7% 0.07kPa
05:00 ☾
9.6°C 13°C 10°C - 7% 0.07kPa
06:00
9.2°C 13°C 10°C - 7% 0.07kPa
07:00
8.9°C 13°C 11°C - 0% 0.14kPa
08:00
8.9°C 13°C 12°C - 0% 0.28kPa
09:00
8.5°C 13°C 14°C - 5% 0.48kPa
10:00
8.2°C 13°C 16°C - 5% 0.68kPa
11:00
7.6°C 13°C 17°C - 5% 0.86kPa
12:00
7.6°C 13°C 18°C - 40% 0.99kPa
13:00
7.5°C 14°C 19°C - 5% 1.1kPa
14:00
7.5°C 14°C 19°C - 12% 1.2kPa
15:00
7.8°C 15°C 20°C - 38% 1.3kPa
16:00
8.2°C 15°C 20°C - 30% 1.3kPa
17:00
8.7°C 15°C 20°C - 57% 1.2kPa
18:00
9.8°C 16°C 20°C - 100% 1.1kPa
19:00
11°C 16°C 18°C - 96% 0.73kPa
20:00
11°C 16°C 17°C - 100% 0.6kPa
21:00 ☾
10°C 15°C 14°C - 100% 0.39kPa
22:00 ☾
9.9°C 15°C 14°C - 100% 0.35kPa
23:00 ☾
9.8°C 15°C 13°C - 96% 0.31kPa
Wed, Aug 26 Sunrise 05:58 Sunset 20:45
24:00 ☾
9.7°C 15°C 13°C - 36% 0.27kPa
01:00 ☾
9.6°C 15°C 12°C - 5% 0.24kPa
02:00 ☾
9.4°C 14°C 12°C - 5% 0.22kPa
03:00 ☾
9.3°C 14°C 12°C - 5% 0.22kPa
04:00 ☾
9.9°C 3251°C 13°C - 36% 0.29kPa
05:00 ☾
11°C 6489°C 15°C - 66% 0.38kPa
06:00 ☾
11°C 9726°C 16°C - 97% 0.48kPa
07:00
11°C 9726°C 16°C - 92% 0.49kPa
08:00
11°C 9726°C 16°C - 87% 0.5kPa
09:00
11°C 9726°C 16°C - 82% 0.51kPa
10:00
12°C 9726°C 16°C - 60% 0.51kPa
11:00
12°C 9726°C 17°C - 38% 0.52kPa
12:00
12°C 9726°C 17°C - 16% 0.53kPa
13:00
12°C 9726°C 17°C - 27% 0.51kPa
14:00
12°C 9726°C 17°C - 38% 0.5kPa
15:00
12°C 9726°C 17°C - 48% 0.49kPa
16:00
12°C 9726°C 17°C - 60% 0.49kPa
17:00
12°C 9726°C 17°C - 72% 0.5kPa
18:00
12°C 9726°C 17°C - 84% 0.5kPa
19:00
12°C 9726°C 17°C - 86% 0.5kPa
20:00
12°C 9726°C 17°C - 88% 0.5kPa
21:00 ☾
12°C 9726°C 17°C - 89% 0.5kPa
22:00 ☾
12°C 9726°C 17°C - 89% 0.47kPa
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

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