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Rule Morning Frost

Morning Frost Forecast for Rovaniemi, Finnish Lapland

Rovaniemi, Lapland, Finland

The Kemijoki and Ounasjoki rivers meet at Rovaniemi, where bridges and winter ice provide distinctly urban Arctic foregrounds. Ounasvaara rises immediately east of the centre for views across the river junction, forest, and city lights.

Currently

Real-time conditions
Soil Temperature11.3°C
Dew Point8.9°C (moderate dew point)
Wind Speed3.3m/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
  • Time Window88% of hours
  • Wind Speed60% of hours

How this forecast is evaluated

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

Explore Morning Frost conditions across Finnish Lapland →

Recorded match history

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

Last 30 days
0
recorded matching windows
Last 90 days
0
recorded matching windows
Last 365 days
12
recorded matching windows · 69% average confidence
Most frequent recorded start hour

07:00 local time, shared by 4 of 12 matches recorded in the last 365 days.

Most represented month

April, with 6 of 12 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
Europe/Helsinki
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Sun, Aug 23
05:000%1.6m/s
06:000%1.9m/s
07:000%1.9m/s
08:000%2.5m/s
09:000%3m/s
10:000%3.7m/s
11:000%4.2m/s
12:000%4.6m/s
13:000%4m/s
14:000%4.5m/s
15:000%4.7m/s
16:000%5.2m/s
17:000%5m/s
18:000%4.6m/s
19:000%4.2m/s
20:000%3.8m/s
21:000%3.9m/s
22:000%3.4m/s
23:000%3.7m/s
Mon, Aug 24
24:000%3.8m/s
01:000%3.7m/s
02:000%3.7m/s
03:000%3.5m/s
04:000%3.1m/s
05:000%3.2m/s
06:000%3.3m/s
07:000%3.7m/s
08:000%3.8m/s
09:000%3.8m/s
10:000%3.8m/s
11:000%3.9m/s
12:000%4m/s
13:000%3.9m/s
14:000%3.7m/s
15:000%3.8m/s
16:000%4.1m/s
17:000%3.7m/s
18:000%3.1m/s
19:000%2.3m/s
20:000%1.4m/s
21:000%1.2m/s
22:000%1.1m/s
23:000%1.5m/s
Tue, Aug 25
24:000%1.3m/s
01:000%1m/s
02:000%0.87m/s
03:000%0.74m/s
04:000%0.54m/s
05:000%0.29m/s
06:000%0.3m/s
07:000%0.47m/s
08:000%0.57m/s
09:000%1m/s
10:000%1.6m/s
11:000%2m/s
12:000%2.2m/s
13:000%2.7m/s
14:000%2.7m/s
15:000%2.7m/s
16:000%2.5m/s
17:000%1.8m/s
18:000%1.5m/s
19:000%1.4m/s
20:000%1.3m/s
21:000%1.1m/s
22:000%1.3m/s
23:000%1.8m/s
Wed, Aug 26
24:000%2.1m/s
01:000%2.2m/s
02:000%2.3m/s
03:000%2.6m/s
04:000%2.1m/s
05:000%2m/s
06:000%1.5m/s
07:000%1.2m/s
08:000%1.9m/s
09:000%3.1m/s
10:000%4.1m/s
11:000%3.7m/s
12:000%2.8m/s
13:000%2.5m/s
14:000%2.4m/s
15:000%2.8m/s
16:000%2.2m/s
17:000%1.6m/s
18:000%0.93m/s
19:000%0.63m/s
20:000%0.33m/s
21:000%0.02m/s
22:000%0.12m/s
23:000%0.21m/s
Thu, Aug 27
24:000%0.31m/s
01:000%0.44m/s
02:000%0.58m/s
03:000%0.71m/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
Mon, Aug 24 Sunrise 05:22 Sunset 21:13
06:00
8.9°C 11°C 10°C - 100% 0.12kPa
07:00
8.8°C 11°C 11°C - 100% 0.16kPa
08:00
8.7°C 11°C 11°C - 100% 0.21kPa
09:00
8.4°C 11°C 12°C - 100% 0.25kPa
10:00
8.5°C 11°C 12°C - 100% 0.3kPa
11:00
8.4°C 11°C 13°C - 100% 0.37kPa
12:00
7.6°C 11°C 13°C - 100% 0.47kPa
13:00
6.5°C 11°C 14°C - 7% 0.65kPa
14:00
6.5°C 12°C 16°C - 7% 0.88kPa
15:00
6.6°C 12°C 17°C - 64% 0.96kPa
16:00
6.8°C 12°C 17°C - 95% 0.93kPa
17:00
7.1°C 12°C 16°C - 55% 0.84kPa
18:00
7°C 13°C 16°C - 19% 0.85kPa
19:00
7.9°C 13°C 16°C - 41% 0.69kPa
20:00
8.3°C 13°C 13°C - 54% 0.44kPa
21:00
7.6°C 12°C 11°C - 5% 0.28kPa
22:00
7.3°C 12°C 10°C - 5% 0.22kPa
23:00
7.3°C 12°C 9.6°C - 5% 0.17kPa
Tue, Aug 25 Sunrise 05:22 Sunset 21:13
24:00
7.1°C 12°C 8.9°C - 5% 0.13kPa
01:00
6.8°C 11°C 8.3°C - 5% 0.11kPa
02:00
6.4°C 11°C 7.9°C - 32% 0.11kPa
03:00
6.1°C 11°C 7.6°C - 100% 0.1kPa
04:00
5.9°C 10°C 7.5°C - 91% 0.1kPa
05:00
5.8°C 10°C 7.4°C - 100% 0.1kPa
06:00
5.9°C 10°C 7.8°C - 100% 0.13kPa
07:00
6.3°C 9.9°C 9.1°C - 100% 0.2kPa
08:00
6.7°C 9.9°C 10°C - 100% 0.29kPa
09:00
7°C 10°C 12°C - 97% 0.41kPa
10:00
7.4°C 10°C 14°C - 96% 0.52kPa
11:00
7.8°C 10°C 15°C - 100% 0.63kPa
12:00
8.2°C 11°C 16°C - 91% 0.71kPa
13:00
8.6°C 11°C 17°C - 76% 0.81kPa
14:00
8.8°C 11°C 18°C - 36% 0.9kPa
15:00
9.1°C 12°C 18°C - 74% 0.92kPa
16:00
11°C 12°C 17°C - 99% 0.62kPa
17:00
12°C 12°C 16°C - 69% 0.43kPa
18:00
12°C 12°C 16°C - 46% 0.47kPa
19:00
11°C 13°C 16°C - 66% 0.45kPa
20:00
10°C 13°C 14°C - 70% 0.35kPa
21:00
9.7°C 12°C 13°C - 76% 0.28kPa
22:00
9.6°C 12°C 12°C - 68% 0.25kPa
23:00
9.6°C 12°C 12°C - 100% 0.21kPa
Wed, Aug 26 Sunrise 05:26 Sunset 21:09
24:00
9.7°C 12°C 12°C - 100% 0.23kPa
01:00
9.4°C 12°C 12°C - 91% 0.22kPa
02:00
8.5°C 12°C 11°C - 71% 0.22kPa
03:00
7.7°C 12°C 9.8°C - 8% 0.16kPa
04:00
6.9°C 11°C 7.9°C - 5% 0.07kPa
05:00
6.6°C 11°C 7.5°C - 5% 0.07kPa
06:00
6.5°C 11°C 7.5°C - 5% 0.07kPa
07:00
6.9°C 11°C 8.8°C - 5% 0.14kPa
08:00
7.2°C 11°C 10°C - 5% 0.24kPa
09:00
7.2°C 11°C 11°C - 14% 0.33kPa
10:00
7.4°C 11°C 12°C - 90% 0.37kPa
11:00
6.4°C 11°C 10°C - 98% 0.29kPa
12:00
5.8°C 11°C 11°C - 30% 0.36kPa
13:00
5.6°C 11°C 13°C - 44% 0.59kPa
14:00
5.2°C 11°C 14°C - 59% 0.7kPa
15:00
4.9°C 11°C 15°C - 71% 0.78kPa
16:00
4.6°C 11°C 13°C - 80% 0.61kPa
17:00
4.1°C 11°C 11°C - 90% 0.47kPa
18:00
3.5°C 10°C 8.9°C - 99% 0.36kPa
19:00
3.5°C 10°C 8.8°C - 99% 0.35kPa
20:00
3.6°C 10°C 8.7°C - 100% 0.34kPa
21:00
3.6°C 10°C 8.6°C - 100% 0.33kPa
22:00
3.7°C 10°C 8.6°C - 100% 0.32kPa
23:00
3.8°C 9.9°C 8.6°C - 100% 0.32kPa
Thu, Aug 27 Sunrise 05:29 Sunset 21:05
24:00
3.9°C 9.8°C 8.7°C - 100% 0.32kPa
01:00
4.3°C 9.7°C 8.7°C - 100% 0.29kPa
02:00
4.7°C 9.6°C 8.8°C - 100% 0.27kPa
03:00
5.2°C 9.6°C 8.8°C - 100% 0.25kPa
04:00
5.5°C 9.5°C 9°C - 100% 0.24kPa
05:00
5.7°C 9.4°C 9.1°C - 100% 0.24kPa
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.

Forecast generated

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