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Rule Fog Hunter

Aulanko - Fog Hunter - Southern Finland

Hämeenlinna, Kanta-Häme, Finland

Thick, moody fog for atmospheric forest and landscape shots

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki
Next opportunity
Dense Fog (lingering)
Aulanko
Fri, Jan 23 · 19:00–21:00 · 2h window
Low confidence
33%

What this forecast looks for

Plain-language explanation from the rule

Southern Finland's lake district and boreal forests create ideal conditions for fog photography. The region's 188,000 lakes, countless bogs, and mixed forests generate reliable morning mist from late summer through autumn.

What makes Southern Finland special for fog photography:

  • Lake fog - Large lakes like Vesijärvi and Saimaa produce dramatic ground fog at dawn
  • Bog mist - Torronsuo and other wetlands create ethereal low-lying fog over boardwalks
  • Forest atmosphere - Nuuksio and Repovesi offer misty woodland scenes with cliff viewpoints
  • Accessibility - Most locations within 2 hours of Helsinki

Peak fog season runs from August through October, with the strongest conditions occurring on calm, clear nights when temperatures drop near the dewpoint. Arrive before sunrise for the most dramatic mist.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 72 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Helsinki
Fog Probability
≥ 85.0%
Dewpoint Spread
≤ 2.0°C
Visibility
≤ 3000.0m
Wind Speed
≤ 2.0m/s
Sat, Jan 10
21:000%3.6°C47600m5.1m/s
22:000%3.8°C58840m5.2m/s
23:000%4.1°C36860m5.4m/s
Sun, Jan 11
24:000%3.9°C29820m5.4m/s
01:000%3.8°C37700m5.5m/s
02:000%3.6°C35440m5.5m/s
03:000%3°C27120m5.5m/s
04:000%2.5°C10320m5.1m/s
05:000%2.2°C7980m4.7m/s
06:000%2.1°C8420m4.5m/s
07:000%2.1°C6380m4.4m/s
08:000%2.2°C6740m4.3m/s
09:000%2.5°C6960m4.3m/s
10:000%2.5°C7260m4.1m/s
11:000%2.5°C8800m4m/s
12:000%2.5°C9560m3.9m/s
13:000%2.5°C9840m3.9m/s
14:000%2.4°C9840m3.8m/s
15:000%2.4°C10740m3.6m/s
16:000%2.2°C9600m3.4m/s
17:000%2.1°C11920m3.1m/s
18:000%1.9°C12120m3m/s
19:000%1.8°C13000m2.9m/s
20:000%1.8°C12480m2.9m/s
21:000%2.2°C13260m3.2m/s
22:000%2.8°C15740m3m/s
23:000%2.7°C16560m2.8m/s
Mon, Jan 12
24:000%1.9°C21020m2.5m/s
01:000%1.5°C23420m2.4m/s
02:000%1.3°C20140m2.4m/s
03:000%1.3°C20640m2.4m/s
04:000%1.3°C13400m2.5m/s
05:000%1.3°C12420m2.2m/s
06:000%1.3°C12460m2.1m/s
07:000%1.3°C30780m2.4m/s
08:000%1.3°C39280m2.6m/s
09:000%1.4°C29080m2.5m/s
10:000%1.4°C29100m2.3m/s
11:000%1.6°C21580m2.3m/s
12:000%1.7°C16820m2.7m/s
13:000%1.7°C8540m2.6m/s
14:000%1.6°C14860m2.5m/s
15:000%1.2°C12160m2.6m/s
16:000%1.1°C16300m2.8m/s
17:000%1.1°C12700m3m/s
18:0081%0.7°C9080m2.7m/s
19:0076%0.9°C8180m2.7m/s
20:0076%0.9°C8120m2.5m/s
21:0076%0.9°C8540m2.4m/s
22:000%1.2°C9220m2.5m/s
23:000%1.2°C7940m2.7m/s
Tue, Jan 13
24:000%1.2°C6020m2.8m/s
01:000%1.3°C5460m2.8m/s
02:000%2.2°C8480m2.9m/s
03:000%2.4°C18980m2.7m/s
04:000%2.2°C18620m2.4m/s
05:000%2.4°C8880m2.1m/s
06:000%2.5°C5000m1.9m/s
07:000%2.5°C7020m2.2m/s
08:000%2.2°C12960m2.8m/s
09:000%1.6°C32680m3.3m/s
10:000%1.3°C30700m3.6m/s
11:000%1.6°C35200m3.5m/s
12:000%2.2°C42580m3.1m/s
13:000%2.1°C40240m3m/s
14:000%2.1°C25140m2.9m/s
15:000%1.6°C17920m2.3m/s
16:000%1.3°C22660m2.5m/s
17:000%1.5°C18280m2.6m/s
18:000%1.3°C18860m2.6m/s
19:000%1.2°C22260m2.5m/s
20:000%1.3°C20960m2.4m/s
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Fog 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
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Wind Gusts
m/s
Sat, Jan 10 Sunrise 09:25 Sunset 15:33
22:00 ☾
-13°C 0mm 74% 0cm -9.1°C 0mm 0.08kPa 9.7m/s
23:00 ☾
-13°C 0mm 72% 0cm -8.9°C 0mm 0.09kPa 10m/s
Sun, Jan 11 Sunrise 09:25 Sunset 15:33
24:00 ☾
-13°C 0mm 73% 0cm -8.8°C 0mm 0.08kPa 10m/s
01:00 ☾
-12°C 0mm 74% 0cm -8.7°C 0mm 0.08kPa 10m/s
02:00 ☾
-12°C 0mm 75% 0cm -8.5°C 0mm 0.08kPa 10m/s
03:00 ☾
-11°C 0mm 79% 0cm -8.4°C 0mm 0.07kPa 10m/s
04:00 ☾
-11°C 0mm 82% 0.07cm -8.4°C 0.1mm 0.06kPa 10m/s
05:00 ☾
-11°C 0mm 84% 0.14cm -8.4°C 0.2mm 0.05kPa 9.4m/s
06:00 ☾
-10°C 0mm 85% 0.14cm -8.4°C 0.2mm 0.05kPa 8.7m/s
07:00 ☾
-10°C 0mm 85% 0.21cm -8.3°C 0.3mm 0.05kPa 8.4m/s
08:00 ☾
-10°C 0mm 84% 0.21cm -8.3°C 0.3mm 0.05kPa 8.3m/s
09:00 ☾
-11°C 0mm 82% 0.14cm -8.4°C 0.2mm 0.06kPa 8.1m/s
10:00
-11°C 0mm 82% 0.14cm -8.4°C 0.2mm 0.06kPa 8m/s
11:00
-11°C 0mm 82% 0.14cm -8.3°C 0.2mm 0.06kPa 7.7m/s
12:00
-11°C 0mm 82% 0.07cm -8.2°C 0.1mm 0.06kPa 7.5m/s
13:00
-11°C 0mm 82% 0.07cm -8.2°C 0.1mm 0.06kPa 7.3m/s
14:00
-10°C 0mm 83% 0.14cm -8.1°C 0.2mm 0.06kPa 7.4m/s
15:00
-10°C 0mm 83% 0.14cm -8°C 0.2mm 0.06kPa 7.1m/s
16:00 ☾
-10°C 0mm 84% 0.14cm -8°C 0.2mm 0.05kPa 6.8m/s
17:00 ☾
-10°C 0mm 85% 0.07cm -7.9°C 0.1mm 0.05kPa 6.3m/s
18:00 ☾
-9.8°C 0mm 86% 0.07cm -7.9°C 0.1mm 0.05kPa 5.8m/s
19:00 ☾
-9.8°C 0mm 87% 0.07cm -8°C 0.1mm 0.04kPa 5.7m/s
20:00 ☾
-9.9°C 0mm 87% 0.07cm -8.1°C 0.1mm 0.04kPa 5.4m/s
21:00 ☾
-10°C 0mm 84% 0.07cm -8.3°C 0.1mm 0.05kPa 6.1m/s
22:00 ☾
-11°C 0mm 80% 0cm -8.3°C 0mm 0.07kPa 6.1m/s
23:00 ☾
-11°C 0mm 81% 0cm -8.5°C 0mm 0.06kPa 5.7m/s
Mon, Jan 12 Sunrise 09:24 Sunset 15:35
24:00 ☾
-11°C 0mm 86% 0cm -9.1°C 0mm 0.04kPa 5.1m/s
01:00 ☾
-11°C 0mm 89% 0cm -9.7°C 0mm 0.03kPa 4.4m/s
02:00 ☾
-11°C 0mm 90% 0cm -10°C 0mm 0.03kPa 4.3m/s
03:00 ☾
-12°C 0mm 90% 0cm -10°C 0mm 0.03kPa 4.2m/s
04:00 ☾
-12°C 0mm 90% 0cm -11°C 0mm 0.03kPa 4.5m/s
05:00 ☾
-12°C 0mm 90% 0cm -11°C 0mm 0.03kPa 4.5m/s
06:00 ☾
-12°C 0mm 90% 0cm -11°C 0mm 0.03kPa 3.9m/s
07:00 ☾
-13°C 0mm 90% 0cm -11°C 0mm 0.03kPa 4.1m/s
08:00 ☾
-13°C 0mm 90% 0cm -12°C 0mm 0.02kPa 4.5m/s
09:00 ☾
-14°C 0mm 89% 0cm -12°C 0mm 0.03kPa 4.5m/s
10:00
-14°C 0mm 89% 0cm -12°C 0mm 0.03kPa 4.4m/s
11:00
-14°C 0mm 88% 0cm -12°C 0mm 0.03kPa 4.1m/s
12:00
-13°C 0mm 87% 0cm -11°C 0mm 0.03kPa 4.8m/s
13:00
-12°C 0mm 87% 0cm -10°C 0mm 0.04kPa 5.1m/s
14:00
-11°C 0mm 88% 0cm -9.4°C 0mm 0.04kPa 5.2m/s
15:00
-10°C 0mm 91% 0cm -8.9°C 0mm 0.03kPa 5.1m/s
16:00 ☾
-9.4°C 0mm 92% 0cm -8.3°C 0mm 0.03kPa 5.4m/s
17:00 ☾
-9.3°C 0mm 92% 0cm -8.2°C 0mm 0.03kPa 5.7m/s
18:00 ☾
-9.1°C 0mm 95% 0cm -8.4°C 0mm 0.02kPa 5.7m/s
19:00 ☾
-9°C 0mm 93% 0cm -8.1°C 0mm 0.02kPa 5.3m/s
20:00 ☾
-8.8°C 0mm 93% 0cm -7.9°C 0mm 0.02kPa 5.2m/s
21:00 ☾
-8.7°C 0mm 93% 0cm -7.8°C 0mm 0.02kPa 4.8m/s
22:00 ☾
-8.9°C 0mm 91% 0cm -7.7°C 0mm 0.03kPa 4.7m/s
23:00 ☾
-8.8°C 0mm 91% 0cm -7.6°C 0mm 0.03kPa 5.2m/s
Tue, Jan 13 Sunrise 09:23 Sunset 15:38
24:00 ☾
-8.7°C 0mm 91% 0cm -7.5°C 0mm 0.03kPa 5.4m/s
01:00 ☾
-9°C 0mm 90% 0cm -7.7°C 0mm 0.03kPa 5.6m/s
02:00 ☾
-10°C 0mm 84% 0cm -8.1°C 0mm 0.05kPa 5.8m/s
03:00 ☾
-10°C 0mm 83% 0cm -8.1°C 0mm 0.06kPa 5.7m/s
04:00 ☾
-10°C 0mm 84% 0cm -8°C 0mm 0.05kPa 5.1m/s
05:00 ☾
-10°C 0mm 83% 0cm -7.9°C 0mm 0.06kPa 4.6m/s
06:00 ☾
-10°C 0mm 82% 0cm -7.9°C 0mm 0.06kPa 4m/s
07:00 ☾
-10°C 0mm 82% 0cm -7.9°C 0mm 0.06kPa 4m/s
08:00 ☾
-10°C 0mm 84% 0cm -8.1°C 0mm 0.05kPa 5.2m/s
09:00 ☾
-10°C 0mm 88% 0cm -8.4°C 0mm 0.04kPa 6.4m/s
10:00
-9.9°C 0mm 90% 0cm -8.6°C 0mm 0.03kPa 7m/s
11:00
-10°C 0mm 88% 0cm -8.5°C 0mm 0.04kPa 7.1m/s
12:00
-11°C 0mm 84% 0cm -8.4°C 0mm 0.05kPa 6.9m/s
13:00
-10°C 0mm 85% 0cm -8.4°C 0mm 0.05kPa 6.2m/s
14:00
-10°C 0mm 85% 0cm -8.2°C 0mm 0.05kPa 6.1m/s
15:00
-10°C 0mm 88% 0cm -8.4°C 0mm 0.04kPa 5.8m/s
16:00 ☾
-9.9°C 0mm 90% 0cm -8.6°C 0mm 0.03kPa 4.7m/s
17:00 ☾
-10°C 0mm 89% 0cm -8.6°C 0mm 0.04kPa 5m/s
18:00 ☾
-9.9°C 0mm 90% 0cm -8.6°C 0mm 0.03kPa 5m/s
19:00 ☾
-9.9°C 0.1mm 91% 0cm -8.7°C 0.1mm 0.03kPa 5m/s
20:00 ☾
-10°C 0mm 90% 0cm -8.7°C 0mm 0.03kPa 4.8m/s
21:00 ☾
-10°C 0mm 90% 0cm -8.9°C 0mm 0.03kPa 4.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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