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Rule Morning Frost

Morning Frost Forecast for Ivalo, Finnish Lapland

Ivalo, Lapland, Finland

Ivalo combines the winding Ivalojoki River with low pine-covered hills, and serves as a practical base for Lake Inari’s wider ice landscapes.

Currently

Real-time conditions
Soil Temperature9.9°C
Dew Point4.9°C (low dew point)
Wind Speed3.0m/s (calm conditions)
Cloud Cover45%

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 Speed83% 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 Ivalo.

Explore Morning Frost conditions across Finnish Lapland →

Recorded match history

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

Last 30 days
0
recorded matching windows
Last 90 days
0
recorded matching windows
Last 365 days
5
recorded matching windows · 70% average confidence

Only 5 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
Thu, Aug 13
07:004.5%1.4m/s
08:004.9%1.7m/s
09:004.9%2.3m/s
10:000%2.2m/s
11:000%2m/s
12:000%2m/s
13:000%2m/s
14:000%2.1m/s
15:000%2.2m/s
16:000%2.2m/s
17:000%2.2m/s
18:000%1.9m/s
19:000%1.9m/s
20:000%1.5m/s
21:000%1.6m/s
22:000%1.8m/s
23:000%2m/s
Fri, Aug 14
24:000%2.2m/s
01:000%2.5m/s
02:000%2.5m/s
03:000%2.2m/s
04:000%2.2m/s
05:000%3.2m/s
06:000%3.1m/s
07:000%3m/s
08:000%3.6m/s
09:000%4.3m/s
10:000%4.7m/s
11:000%5.1m/s
12:000%5.5m/s
13:000%5.4m/s
14:000%5.9m/s
15:000%5.4m/s
16:000%5.5m/s
17:000%5.4m/s
18:000%5.2m/s
19:000%4.8m/s
20:000%4.5m/s
21:000%4.1m/s
22:000%3.9m/s
23:000%3.7m/s
Sat, Aug 15
24:000%3.5m/s
01:000%3.2m/s
02:000%3m/s
03:000%2.8m/s
04:000%2.6m/s
05:000%2.5m/s
06:000%2.4m/s
07:000%2.3m/s
08:000%2.2m/s
09:000%2.2m/s
10:000%2.3m/s
11:000%2.5m/s
12:000%2.8m/s
13:000%3.2m/s
14:000%3.4m/s
15:000%3.3m/s
16:000%3.1m/s
17:000%3m/s
18:000%3m/s
19:000%2.9m/s
20:000%2.8m/s
21:000%2.8m/s
22:000%2.6m/s
23:000%2.5m/s
Sun, Aug 16
24:000%2.3m/s
01:000%2.5m/s
02:000%2.2m/s
03:000%2.1m/s
04:000%2m/s
05:000%2m/s
06:000%2m/s
07:000%1.8m/s
08:000%1.8m/s
09:000%1.7m/s
10:000%1.7m/s
11:000%1.5m/s
12:000%1.3m/s
13:000%1.3m/s
14:000%1.7m/s
15:000%1.9m/s
16:000%1.8m/s
17:000%1.7m/s
18:000%1.5m/s
19:000%1.4m/s
20:000%1.3m/s
21:000%1.2m/s
22:000%1.2m/s
23:000%1.2m/s
Mon, Aug 17
24:000%1.2m/s
01:000%1.3m/s
02:000%1.3m/s
03:000%1.4m/s
04:000%1.6m/s
05:000%1.8m/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
Europe/Helsinki
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Fri, Aug 14 Sunrise 04:18 Sunset 22:07
07:00
4.9°C 9.9°C 9.5°C - 45% 0.32kPa
08:00
5.4°C 10°C 11°C - 49% 0.44kPa
09:00
5.9°C 10°C 13°C - 84% 0.53kPa
10:00
5.9°C 10°C 14°C - 56% 0.62kPa
11:00
5.4°C 11°C 14°C - 74% 0.75kPa
12:00
5.5°C 11°C 15°C - 74% 0.77kPa
13:00
6.8°C 12°C 15°C - 73% 0.75kPa
14:00
7.5°C 12°C 15°C - 100% 0.63kPa
15:00
8.5°C 12°C 14°C - 100% 0.44kPa
16:00
8.4°C 12°C 12°C - 100% 0.31kPa
17:00
8°C 12°C 12°C - 100% 0.29kPa
18:00
7.7°C 12°C 11°C - 100% 0.3kPa
19:00
7.6°C 12°C 11°C - 100% 0.3kPa
20:00
7.7°C 12°C 11°C - 100% 0.3kPa
21:00
7.9°C 12°C 11°C - 100% 0.28kPa
22:00
8°C 11°C 11°C - 100% 0.26kPa
23:00
8°C 11°C 11°C - 100% 0.24kPa
Sat, Aug 15 Sunrise 04:18 Sunset 22:07
24:00
8.1°C 11°C 11°C - 100% 0.23kPa
01:00
8.2°C 11°C 11°C - 100% 0.22kPa
02:00
8.3°C 11°C 11°C - 100% 0.21kPa
03:00
8.5°C 11°C 11°C - 100% 0.18kPa
04:00
9°C 11°C 10°C - 100% 0.1kPa
05:00
9.2°C 11°C 10°C - 100% 0.07kPa
06:00
9.3°C 11°C 10°C - 100% 0.06kPa
07:00
9.4°C 11°C 10°C - 100% 0.06kPa
08:00
9.5°C 11°C 10°C - 100% 0.06kPa
09:00
9.6°C 10°C 10°C - 100% 0.06kPa
10:00
9.6°C 10°C 10°C - 100% 0.07kPa
11:00
9.7°C 10°C 11°C - 100% 0.07kPa
12:00
9.9°C 10°C 11°C - 100% 0.07kPa
13:00
10°C 10°C 11°C - 100% 0.09kPa
14:00
10°C 10°C 11°C - 100% 0.1kPa
15:00
10°C 10°C 11°C - 100% 0.09kPa
16:00
10°C 10°C 11°C - 100% 0.1kPa
17:00
10°C 10°C 11°C - 100% 0.1kPa
18:00
10°C 11°C 12°C - 100% 0.1kPa
19:00
11°C 11°C 12°C - 100% 0.1kPa
20:00
11°C 11°C 11°C - 99% 0.09kPa
21:00
11°C 11°C 11°C - 97% 0.07kPa
22:00
10°C 11°C 11°C - 100% 0.06kPa
23:00
10°C 11°C 11°C - 100% 0.05kPa
Sun, Aug 16 Sunrise 04:22 Sunset 22:02
24:00
10°C 11°C 11°C - 100% 0.05kPa
01:00
10°C 10°C 11°C - 100% 0.05kPa
02:00
10°C 10°C 11°C - 100% 0.05kPa
03:00
10°C 10°C 11°C - 100% 0.05kPa
04:00
10°C 10°C 11°C - 100% 0.05kPa
05:00
10°C 10°C 11°C - 100% 0.05kPa
06:00
10°C 10°C 11°C - 100% 0.05kPa
07:00
11°C 10°C 11°C - 100% 0.06kPa
08:00
11°C 10°C 11°C - 100% 0.07kPa
09:00
11°C 10°C 12°C - 100% 0.08kPa
10:00
11°C 11°C 12°C - 100% 0.06kPa
11:00
11°C 11°C 11°C - 100% 0.04kPa
12:00
11°C 11°C 12°C - 95% 0.06kPa
13:00
11°C 11°C 13°C - 78% 0.15kPa
14:00
11°C 11°C 14°C - 87% 0.28kPa
15:00
12°C 11°C 14°C - 97% 0.26kPa
16:00
11°C 11°C 13°C - 98% 0.21kPa
17:00
11°C 12°C 12°C - 99% 0.16kPa
18:00
10°C 12°C 11°C - 100% 0.12kPa
19:00
9.3°C 12°C 11°C - 100% 0.13kPa
20:00
8.6°C 11°C 10°C - 100% 0.13kPa
21:00
8°C 11°C 9.8°C - 100% 0.14kPa
22:00
7.9°C 11°C 9.9°C - 100% 0.16kPa
23:00
7.8°C 11°C 10°C - 100% 0.17kPa
Mon, Aug 17 Sunrise 04:27 Sunset 21:57
24:00
7.8°C 11°C 10°C - 100% 0.19kPa
01:00
7.6°C 11°C 10°C - 100% 0.2kPa
02:00
7.4°C 11°C 10°C - 100% 0.2kPa
03:00
7.2°C 11°C 10°C - 100% 0.21kPa
04:00
7.2°C 11°C 10°C - 100% 0.22kPa
05:00
7.2°C 10°C 10°C - 100% 0.23kPa
06:00
7.2°C 10°C 10°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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