Rule Morning Frost

Morning Frost Forecast for Porjus, Swedish Lapland

Porjus, Norrbotten, Sweden

Porjus grew beside a major hydroelectric station on the regulated Lule River, so dams, transmission structures, and reservoir shorelines define its foregrounds. Sparse boreal forest and the broad water or winter ice lead west toward the less developed mountain landscapes of Laponia.

Currently

Real-time conditions

Frost Probability

Soil Temperature11.2°C

Dew Point6.9°C (moderate dew point)

Wind Speed3.8m/s (calm conditions)

Cloud Cover64%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Stockholm

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (74-hour forecast)

Frost Probability100% of hours
Time Window88% of hours
Wind Speed54% of hours

How this forecast is evaluated

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

Explore Morning Frost conditions across Swedish Lapland →

Recorded match history

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

Last 30 days

recorded matching windows

Last 90 days

recorded matching windows

Last 365 days

recorded matching windows · 74% average confidence

Most frequent recorded start hour

09:00 local time, shared by 6 of 15 matches recorded in the last 365 days.

Most represented month

February, with 10 of 15 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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74-hour requirements breakdown

When available, the detailed table below covers only the stated 74-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 74 hours

AND logic: all conditions required

Meets requirement

Misses requirement

Time Europe/Stockholm	Time Window Sunrise -45m to +90m	Frost Probability ≥ 60.0%	Wind Speed ≤ 1.5m/s
Tue, Aug 25
06:00	✓	0%	1m/s
07:00	✕	0%	1.1m/s
08:00	✕	0%	2.1m/s
09:00	✕	0%	3.2m/s
10:00	✕	0%	3.8m/s
11:00	✕	0%	3.6m/s
12:00	✕	0%	4m/s
13:00	✕	0%	4m/s
14:00	✕	0%	4.5m/s
15:00	✕	0%	4.2m/s
16:00	✕	0%	3.7m/s
17:00	✕	0%	4m/s
18:00	✕	0%	3.7m/s
19:00	✕	0%	3.2m/s
20:00	✕	0%	2.6m/s
21:00	✕	0%	2.1m/s
22:00	✕	0%	2m/s
23:00	✕	0%	2.1m/s
Wed, Aug 26
24:00	✕	0%	2m/s
01:00	✕	0%	1.8m/s
02:00	✕	0%	1.6m/s
03:00	✕	0%	1.5m/s
04:00	✓	0%	1.4m/s
05:00	✓	0%	1.1m/s
06:00	✓	0%	0.79m/s
07:00	✕	0%	0.62m/s
08:00	✕	0%	0.7m/s
09:00	✕	0%	0.67m/s
10:00	✕	0%	0.71m/s
11:00	✕	0%	1.2m/s
12:00	✕	0%	1.7m/s
13:00	✕	0%	2.2m/s
14:00	✕	0%	2.4m/s
15:00	✕	0%	1.8m/s
16:00	✕	0%	1.4m/s
17:00	✕	0%	1m/s
18:00	✕	0%	1.3m/s
19:00	✕	0%	1.6m/s
20:00	✕	0%	1.7m/s
21:00	✕	0%	1.7m/s
22:00	✕	0%	1.6m/s
23:00	✕	0%	1.1m/s
Thu, Aug 27
24:00	✕	0%	0.41m/s
01:00	✕	0%	0.56m/s
02:00	✕	0%	0.7m/s
03:00	✕	0%	0.64m/s
04:00	✓	0%	0.64m/s
05:00	✓	0%	0.75m/s
06:00	✓	0%	0.78m/s
07:00	✕	0%	0.61m/s
08:00	✕	0%	0.65m/s
09:00	✕	0%	1.1m/s
10:00	✕	0%	1.7m/s
11:00	✕	0%	2.1m/s
12:00	✕	0%	2.4m/s
13:00	✕	0%	2.7m/s
14:00	✕	0%	2.6m/s
15:00	✕	0%	2.2m/s
16:00	✕	0%	1.8m/s
17:00	✕	0%	1.4m/s
18:00	✕	0%	1.3m/s
19:00	✕	0%	1.1m/s
20:00	✕	0%	1m/s
21:00	✕	0%	0.99m/s
22:00	✕	0%	0.94m/s
23:00	✕	0%	0.88m/s
Fri, Aug 28
24:00	✕	0%	0.93m/s
01:00	✕	0%	0.98m/s
02:00	✕	0%	1m/s
03:00	✕	0%	1.6m/s
04:00	✓	0%	2.1m/s
05:00	✓	0%	2.6m/s
06:00	✓	0%	2.5m/s
07:00	✕	0%	2.5m/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/Stockholm	Dew Point °C	Surface Temperature °C	Temperature °C	Time Window	Total Cloud Coverage %	Vapor Pressure Deficit kPa
Tue, Aug 25 Sunrise 04:47 Sunset 20:35
10:00	6.9°C	11°C	15°C	-	64%	0.7kPa
11:00	7°C	11°C	15°C	-	94%	0.74kPa
12:00	6.9°C	12°C	16°C	-	94%	0.79kPa
13:00	6.7°C	12°C	16°C	-	79%	0.86kPa
14:00	6.7°C	12°C	16°C	-	88%	0.85kPa
15:00	6.7°C	13°C	16°C	-	92%	0.78kPa
16:00	7.1°C	13°C	14°C	-	100%	0.64kPa
17:00	7.6°C	13°C	13°C	-	98%	0.5kPa
18:00	7.8°C	13°C	13°C	-	82%	0.42kPa
19:00	7.7°C	13°C	12°C	-	23%	0.36kPa
20:00	7.4°C	12°C	11°C	-	15%	0.25kPa
21:00 ☾	7.1°C	12°C	9.4°C	-	20%	0.17kPa
22:00 ☾	6.8°C	12°C	9.1°C	-	5%	0.17kPa
23:00 ☾	6.5°C	11°C	8.8°C	-	5%	0.16kPa
Wed, Aug 26 Sunrise 04:47 Sunset 20:35
24:00 ☾	6.3°C	11°C	8.7°C	-	5%	0.17kPa
01:00 ☾	6.1°C	11°C	8.3°C	-	5%	0.15kPa
02:00 ☾	5.9°C	11°C	7.8°C	-	5%	0.13kPa
03:00 ☾	5.7°C	10°C	7.5°C	-	5%	0.12kPa
04:00 ☾	5.5°C	10°C	7.2°C	-	5%	0.11kPa
05:00	5.4°C	9.7°C	7°C	-	22%	0.1kPa
06:00	5.5°C	9.4°C	7.7°C	-	54%	0.15kPa
07:00	5.8°C	9.4°C	9.4°C	-	47%	0.26kPa
08:00	5.8°C	9.5°C	11°C	-	64%	0.41kPa
09:00	5.6°C	9.8°C	13°C	-	5%	0.54kPa
10:00	5.4°C	10°C	14°C	-	5%	0.71kPa
11:00	5.2°C	11°C	15°C	-	5%	0.81kPa
12:00	5.1°C	11°C	15°C	-	29%	0.87kPa
13:00	4.9°C	11°C	16°C	-	86%	0.9kPa
14:00	5°C	12°C	15°C	-	100%	0.87kPa
15:00	5.6°C	12°C	15°C	-	100%	0.77kPa
16:00	5.6°C	12°C	15°C	-	100%	0.8kPa
17:00	6°C	12°C	15°C	-	94%	0.78kPa
18:00	7°C	12°C	14°C	-	91%	0.64kPa
19:00	7.3°C	12°C	13°C	-	86%	0.51kPa
20:00	7°C	12°C	12°C	-	82%	0.41kPa
21:00 ☾	6.7°C	12°C	11°C	-	80%	0.37kPa
22:00 ☾	6.8°C	12°C	11°C	-	65%	0.33kPa
23:00 ☾	6.8°C	12°C	10°C	-	43%	0.26kPa
Thu, Aug 27 Sunrise 04:50 Sunset 20:31
24:00 ☾	6.6°C	11°C	9°C	-	43%	0.18kPa
01:00 ☾	6.4°C	11°C	8.6°C	-	77%	0.15kPa
02:00 ☾	6.5°C	11°C	8.7°C	-	67%	0.16kPa
03:00 ☾	6.4°C	11°C	8.6°C	-	53%	0.16kPa
04:00 ☾	6.1°C	10°C	7.4°C	-	100%	0.09kPa
05:00	5.9°C	9.9°C	7.1°C	-	98%	0.08kPa
06:00	6.4°C	9.7°C	7.9°C	-	90%	0.11kPa
07:00	6.8°C	9.6°C	9.2°C	-	76%	0.17kPa
08:00	7.1°C	9.6°C	11°C	-	52%	0.26kPa
09:00	7.3°C	9.9°C	12°C	-	62%	0.41kPa
10:00	7.1°C	10°C	13°C	-	88%	0.54kPa
11:00	7°C	10°C	14°C	-	76%	0.64kPa
12:00	7.3°C	11°C	15°C	-	69%	0.71kPa
13:00	8°C	11°C	16°C	-	60%	0.73kPa
14:00	8.8°C	12°C	16°C	-	82%	0.73kPa
15:00	9.4°C	12°C	15°C	-	67%	0.5kPa
16:00	9.7°C	12°C	13°C	-	52%	0.31kPa
17:00	9.9°C	12°C	12°C	-	37%	0.15kPa
18:00	9.3°C	11°C	11°C	-	38%	0.11kPa
19:00	8.8°C	11°C	9.7°C	-	38%	0.07kPa
20:00	8.2°C	11°C	8.8°C	-	38%	0.04kPa
21:00 ☾	8°C	11°C	8.5°C	-	56%	0.04kPa
22:00 ☾	7.8°C	10°C	8.3°C	-	74%	0.04kPa
23:00 ☾	7.6°C	10°C	8.1°C	-	92%	0.04kPa
Fri, Aug 28 Sunrise 04:54 Sunset 20:27
24:00 ☾	8.2°C	10°C	9.2°C	-	88%	0.07kPa
01:00 ☾	8.9°C	10°C	10°C	-	84%	0.11kPa
02:00 ☾	9.5°C	10°C	11°C	-	80%	0.16kPa
03:00 ☾	10°C	10°C	13°C	-	73%	0.26kPa
04:00 ☾	10°C	11°C	14°C	-	67%	0.37kPa
05:00	11°C	11°C	16°C	-	61%	0.5kPa
06:00	11°C	11°C	16°C	-	73%	0.5kPa
07:00	11°C	12°C	16°C	-	85%	0.51kPa
08:00	11°C	12°C	16°C	-	96%	0.51kPa
09:00	11°C	12°C	16°C	-	98%	0.53kPa

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 25, 2026, 7:29 AM UTC

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