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Rule Fog Hunter

Ullswater - Fog Hunter - Lake District

Penrith, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread2.0°C
Visibility24134 (Clear)
Relative Humidity87%
Wind Speed4.9m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Dense Fog
Ullswater
Sun, Jun 14 · 24:00–03:00 · 3h window
High confidence
75%
🌫️Fog Probability86-100%
Dewpoint Spread: 0.3°C
Visibility: 221 (Fog)
Relative Humidity: 98%
Wind Speed: 1.5m/s (calm conditions)
fog weather icon
Dense Fog at Dawn
Ullswater
Sun, Jun 14 · 03:00–04:00
🌫️Fog Probability:100%
Medium
fog weather icon
Dense Fog at Sunrise
Ullswater
Sun, Jun 14 · 04:00–05:00
🌫️Fog Probability:100%
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions that create the Lake District's legendary atmospheric photography. We combine fog probability, dewpoint spread, visibility, and wind data to predict when and where mist will form over these famous lakes and valleys.

The Lake District's combination of lakes, tarns, and enclosed valleys creates ideal conditions for fog formation. Cool, calm nights allow mist to pool in valley bottoms, creating ethereal scenes at dawn that have inspired poets and photographers for centuries.

What makes the Lake District special for fog photography:

  • Lake mist - Cold water surfaces generate fog that pools over the lakes at dawn
  • Valley inversions - Mountain-ringed valleys trap mist while fells rise above
  • Romantic landscapes - This is Wordsworth and Turner country, with timeless views
  • Accessible locations - Well-maintained paths reach viewpoints above the fog layer

Peak fog season runs from late August through October, when temperature differentials are greatest. The best conditions typically occur on calm, clear nights when temperatures drop near dewpoint. Arrive before dawn—lake mist often lifts within an hour or two of sunrise. Higher viewpoints like Catbells or Loughrigg offer shots looking down at fog-filled valleys.

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72-hour requirements breakdown

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/London
Fog Probability
≥ 75.0%
Fri, Jun 5
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sat, Jun 6
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sun, Jun 7
24:000%
01:000%
02:000%
03:000%
04:0055%
05:0055%
06:0038%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Mon, Jun 8
24:000%
01:0021%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0018%
20:000%
21:000%
22:000%
23:000%
Tue, Jun 9
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
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/London
Clear Sky Probability (Ensemble)
%
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Solar Elevation
°
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Sat, Jun 6 Sunrise 04:38 Sunset 21:42
09:00
0% 7.4°C 0.1mm 87% 0cm 34° 9.4°C 0.13mm 0.15kPa 24134m 11m/s 4.9m/s
10:00
0% 7.5°C 0.14mm 89% 0cm 43° 9.2°C 0.25mm 0.13kPa 24134m 11m/s 4.7m/s
11:00
0% 7.7°C 0.09mm 90% 0cm 50° 9.2°C 0.38mm 0.11kPa 24134m 11m/s 4.6m/s
12:00
0% 8.1°C 0mm 91% 0cm 55° 9.4°C 0.44mm 0.1kPa 22628m 10m/s 4.3m/s
13:00
0% 9°C 0mm 92% 0cm 58° 10°C 0.44mm 0.1kPa 10611m 9.6m/s 3.9m/s
14:00
0% 9.7°C 0mm 89% 0cm 57° 11°C 0mm 0.15kPa 13279m 7.8m/s 3.8m/s
15:00
0% 9.7°C 0mm 85% 0cm 52° 12°C 0.06mm 0.21kPa 24135m 6.4m/s 3.9m/s
16:00
0% 9.6°C 0mm 83% 0cm 45° 12°C 0.06mm 0.25kPa 24135m 5.1m/s 3.2m/s
17:00
0% 9.7°C 0mm 78% 0cm 37° 13°C 0.06mm 0.33kPa 24134m 3.7m/s 2.1m/s
18:00
0% 9.8°C 0mm 77% 0cm 28° 14°C 0.06mm 0.35kPa 24134m 2.7m/s 1.5m/s
19:00
0% 10°C 0.01mm 84% 0cm 20° 13°C 0.13mm 0.24kPa 24134m 0.61m/s 0.61m/s
20:00
2% 10°C 0mm 86% 0cm 12° 13°C 0.06mm 0.2kPa 24135m 1m/s 1m/s
21:00
5% 9.9°C 0mm 88% 0cm 4.1° 12°C 0.06mm 0.16kPa 24134m 1.5m/s 1.6m/s
22:00 ☾
7% 9.8°C 0.01mm 91% 0cm -2.5° 11°C 0.06mm 0.12kPa 24135m 1.6m/s 1.6m/s
23:00 ☾
5% 9.9°C 0.02mm 93% 0cm -7.7° 11°C 0.13mm 0.09kPa 24135m 1.3m/s 1.4m/s
Sun, Jun 7 Sunrise 04:38 Sunset 21:42
24:00 ☾
3% 9.9°C 0mm 94% 0cm -11° 11°C 0.13mm 0.08kPa 24134m 1.6m/s 1.4m/s
01:00 ☾
1% 9.9°C 0mm 94% 0cm -13° 11°C 0.19mm 0.08kPa 22661m 2.2m/s 1.4m/s
02:00 ☾
1% 9.8°C 0mm 92% 0cm -12° 11°C 0.06mm 0.1kPa 24135m 6.4m/s 2.4m/s
03:00 ☾
0% 8°C 0mm 94% 0cm -9° 8.8°C 0.06mm 0.06kPa 24135m 1.8m/s 1.9m/s
04:00 ☾
0% 7.4°C 0mm 95% 0cm -4.4° 8.1°C 0.06mm 0.05kPa 23294m 2.8m/s 2.8m/s
05:00
0% 7.2°C 0mm 97% 0cm 2° 7.7°C 0.06mm 0.03kPa 15024m 4.4m/s 3.3m/s
06:00
0% 8.3°C 0mm 95% 0cm 9° 9°C 0.06mm 0.06kPa 24126m 5.8m/s 3.6m/s
07:00
0% 9.4°C 0mm 93% 0cm 17° 10°C 0.06mm 0.08kPa 21134m 6.7m/s 3.7m/s
08:00
0% 11°C 0mm 89% 0cm 26° 12°C 0mm 0.15kPa 22564m 8.8m/s 3.8m/s
09:00
0% 11°C 0mm 86% 0cm 34° 13°C 0mm 0.22kPa 24135m 8.7m/s 5.2m/s
10:00
0% 10°C 0mm 80% 0cm 43° 14°C 0.06mm 0.3kPa 24134m 9.6m/s 6.2m/s
11:00
0% 10°C 0mm 80% 0cm 50° 14°C 0.06mm 0.32kPa 24134m 10m/s 6.1m/s
12:00
0% 11°C 0mm 75% 0cm 56° 15°C 0.13mm 0.44kPa 24135m 11m/s 7.7m/s
13:00
0% 11°C 0mm 72% 0cm 58° 16°C 0.19mm 0.5kPa 24135m 13m/s 9.1m/s
14:00
0% 11°C 0mm 74% 0cm 57° 16°C 0.06mm 0.47kPa 19255m 14m/s 9.9m/s
15:00
0% 12°C 0mm 78% 0cm 52° 16°C 0.38mm 0.4kPa 21085m 14m/s 9.8m/s
16:00
0% 12°C 0mm 80% 0cm 45° 16°C 0.56mm 0.36kPa 23570m 14m/s 9.2m/s
17:00
0% 13°C 0mm 82% 0cm 37° 15°C 0.88mm 0.31kPa 16246m 15m/s 8.8m/s
18:00
0% 12°C 0.01mm 87% 0cm 28° 14°C 1.3mm 0.21kPa 16487m 13m/s 7.8m/s
19:00
0% 12°C 0mm 89% 0cm 20° 14°C 1.6mm 0.17kPa 23993m 11m/s 5.5m/s
20:00
1% 11°C 0mm 90% 0cm 12° 13°C 0.06mm 0.15kPa 24134m 9.9m/s 4.3m/s
21:00
1% 11°C 0mm 89% 0cm 4.2° 13°C 0.13mm 0.16kPa 24134m 8.9m/s 4m/s
22:00 ☾
2% 10°C 0mm 89% 0cm -2.4° 12°C 0.13mm 0.16kPa 24134m 6m/s 3.1m/s
23:00 ☾
1% 11°C 0.01mm 90% 0cm -7.6° 12°C 0.19mm 0.14kPa 24135m 8.1m/s 3.7m/s
Mon, Jun 8 Sunrise 04:37 Sunset 21:43
24:00 ☾
1% 10°C 0mm 90% 0cm -11° 12°C 0.25mm 0.14kPa 24134m 7.9m/s 3.9m/s
01:00 ☾
0% 9.9°C 0.05mm 95% 0cm -12° 11°C 0.25mm 0.07kPa 24134m 7.5m/s 4.2m/s
02:00 ☾
0% 10°C 0.5mm 93% 0cm -12° 11°C 0.19mm 0.09kPa 22197m 8.5m/s 4.8m/s
03:00 ☾
0% 11°C 1mm 97% 0cm -9° 11°C 1mm 0.04kPa 10081m 8.5m/s 4.2m/s
04:00 ☾
0% 11°C 0.53mm 97% 0cm -4.3° 11°C 2.3mm 0.04kPa 10031m 10m/s 4.8m/s
05:00
0% 11°C 1.3mm 96% 0cm 2° 11°C 3.6mm 0.05kPa 7751m 12m/s 5.6m/s
06:00
0% 10°C 0.19mm 95% 0cm 9.1° 11°C 4.1mm 0.07kPa 22517m 13m/s 6.5m/s
07:00
0% 10°C 0mm 94% 0cm 17° 11°C 4.2mm 0.07kPa 22933m 12m/s 5.8m/s
08:00
0% 11°C 0.28mm 93% 0cm 26° 12°C 0.19mm 0.09kPa 22975m 11m/s 5.4m/s
09:00
1% 11°C 1.3mm 94% 0cm 34° 12°C 0.88mm 0.08kPa 8476m 11m/s 5.4m/s
10:00
1% 11°C 0.04mm 95% 0cm 43° 11°C 1.4mm 0.07kPa 24135m 12m/s 5.6m/s
11:00
1% 11°C 0.14mm 92% 0cm 50° 12°C 1.6mm 0.11kPa 22320m 12m/s 5.5m/s
12:00
2% 11°C 3.5mm 94% 0cm 56° 12°C 3.4mm 0.08kPa 4408m 14m/s 6.7m/s
13:00
2% 8.8°C 0mm 91% 0cm 58° 10°C 4.7mm 0.11kPa 24134m 9.8m/s 6.1m/s
14:00
17% 7.6°C 0mm 92% 0cm 57° 8.9°C 3.1mm 0.09kPa 24134m 7.9m/s 5.1m/s
15:00
33% 6.4°C 0mm 92% 0cm 52° 7.6°C 1.6mm 0.08kPa 24135m 6m/s 4.1m/s
16:00
48% 5.2°C 0mm 92% 0cm 45° 6.4°C 0.06mm 0.07kPa 24135m 4.1m/s 3.1m/s
17:00
49% 5.6°C 0.17mm 93% 0cm 37° 6.6°C 0.35mm 0.07kPa 19378m 5.9m/s 3.4m/s
18:00
50% 6°C 0.34mm 94% 0cm 29° 6.9°C 0.65mm 0.06kPa 14621m 7.8m/s 3.7m/s
19:00
51% 6.4°C 0.51mm 95% 0cm 20° 7.2°C 0.94mm 0.05kPa 9864m 9.6m/s 4m/s
20:00
51% 6.1°C 0.36mm 94% 0cm 12° 6.9°C 1.2mm 0.06kPa 14621m 9.9m/s 4.4m/s
21:00
52% 5.7°C 0.22mm 94% 0cm 4.3° 6.7°C 1.5mm 0.06kPa 19378m 10m/s 4.8m/s
22:00 ☾
52% 5.4°C 0.07mm 93% 0cm -2.3° 6.4°C 1.8mm 0.07kPa 24135m 10m/s 5.2m/s
23:00 ☾
46% 5.4°C 0.1mm 92% 0cm -7.5° 6.6°C 1.9mm 0.07kPa 23307m 10m/s 5.4m/s
Tue, Jun 9 Sunrise 04:36 Sunset 21:43
24:00 ☾
41% 5.5°C 0.12mm 92% 0cm -11° 6.7°C 2mm 0.08kPa 22478m 10m/s 5.6m/s
01:00 ☾
35% 5.5°C 0.15mm 91% 0cm -12° 6.9°C 2.2mm 0.09kPa 21650m 9.9m/s 5.8m/s
02:00 ☾
29% 5.7°C 0.1mm 92% 0cm -12° 7°C 1.8mm 0.08kPa 18926m 10m/s 6.5m/s
03:00 ☾
24% 5.9°C 0.05mm 92% 0cm -8.9° 7.1°C 1.4mm 0.08kPa 16203m 11m/s 7.3m/s
04:00 ☾
18% 6.1°C 0mm 93% 0cm -4.2° 7.1°C 1.1mm 0.07kPa 13480m 12m/s 8m/s
05:00
15% 6.6°C 0.05mm 93% 0cm 2.1° 7.7°C 1.4mm 0.08kPa 13532m 12m/s 8.2m/s
06:00
11% 7.1°C 0.11mm 92% 0cm 9.1° 8.2°C 1.8mm 0.08kPa 13584m 12m/s 8.3m/s
07:00
8% 7.5°C 0.16mm 92% 0cm 17° 8.7°C 2.2mm 0.09kPa 13637m 12m/s 8.4m/s
08:00
11% 7.3°C 0.14mm 89% 0cm 26° 9°C 1.8mm 0.12kPa 15732m 12m/s 8.4m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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