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Rule Fog Hunter

Lower Slaughter - Fog Hunter - Cotswolds

Lower Slaughter, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread6.8°C
Visibility24134 (Clear)
Relative Humidity63%
Wind Speed6.0m/s (moderate winds)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Moderate Fog
Lower Slaughter
Mon, Apr 20 · 22:00–02:00 · 4h window
Medium confidence
41%
🌫️Fog Probability67.2-77.1%
Dewpoint Spread: 0.4°C
Visibility: 24135 (Clear)
Relative Humidity: 97%
Wind Speed: 2.7m/s (calm conditions)

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks morning mist and fog conditions that transform the Cotswolds' gentle landscapes into atmospheric scenes worthy of a Constable painting. We monitor temperature inversions, humidity levels, and overnight cooling to predict when valley fog will blanket the honey-stone villages and rolling hills.

The Cotswolds' distinctive topography of shallow river valleys creates perfect conditions for radiation fog and valley mist. Cold air pools in valleys overnight, and when combined with moisture from the River Windrush and its tributaries, creates dreamy morning conditions that soften the already pastoral landscape.

What makes Cotswolds fog photography special:

  • Slad Valley inversions - Laurie Lee's famous valley fills with morning mist, with hilltop villages emerging as islands above the fog layer
  • Arlington Row mist - Bibury's iconic weavers' cottages partially obscured by dawn fog, with honey-stone glowing through the haze
  • Valley villages - Bourton-on-the-Water and Lower Slaughter with fog settled along their streams, stone bridges emerging from mist
  • Church tower beacons - Stow-on-the-Wold and Painswick church towers rising above fog blankets, marking village locations

The best fog photography occurs on calm, clear autumn and winter mornings (September-March) following cold nights. Slad Valley—immortalized in Laurie Lee's "Cider with Rosie"—is particularly reliable for valley fog, with viewpoints along the valley rim offering elevated perspectives. Arlington Row benefits from mist rising from the River Coln, creating dreamy morning compositions of England's most photographed street. Arrive before dawn to capture the transition from pre-dawn blue light through foggy golden hour. Fog typically burns off by mid-morning, creating a narrow window of opportunity.

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72-hour requirements breakdown

What passed or failed, hour by hour
4matching hours in the next 79 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Sat, Apr 18
06:0026%
07:000%
08:000%
09:000%
10:000%
11:000%
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23:000%
Sun, Apr 19
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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Mon, Apr 20
24:000%
01:000%
02:000%
03:000%
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05:000%
06:000%
07:000%
08:000%
09:000%
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19:000%
20:000%
21:000%
22:0077%
23:0073%
Tue, Apr 21
24:0067%
01:0067%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
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, Apr 18 Sunrise 06:04 Sunset 20:09
14:00
59% 5.5°C 0mm 63% 0cm 48° 12°C 0mm 0.53kPa 24134m 6.8m/s 6m/s
15:00
67% 5.4°C 0mm 64% 0cm 43° 12°C 0.06mm 0.5kPa 24135m 6.5m/s 5.9m/s
16:00
75% 5.7°C 0mm 71% 0cm 36° 11°C 0.13mm 0.38kPa 24135m 6m/s 5.1m/s
17:00
76% 6°C 0mm 71% 0cm 28° 11°C 0.13mm 0.38kPa 24135m 5.3m/s 3.9m/s
18:00
76% 7.2°C 0mm 79% 0cm 19° 11°C 0.5mm 0.27kPa 11182m 6.3m/s 4.7m/s
19:00
77% 6.7°C 0mm 86% 0cm 9.7° 9°C 0.94mm 0.16kPa 24134m 7.8m/s 3.4m/s
20:00
84% 5.7°C 0mm 88% 0cm 0.98° 7.6°C 0mm 0.13kPa 24135m 8.1m/s 3.2m/s
21:00
92% 4.1°C 0mm 89% 0cm -7.9° 5.8°C 0mm 0.1kPa 24135m 3.2m/s 2.6m/s
22:00
99% 3.1°C 0mm 88% 0cm -15° 4.9°C 0mm 0.1kPa 24134m 2.1m/s 2.1m/s
23:00
99% 2.6°C 0mm 88% 0cm -21° 4.4°C 0mm 0.1kPa 24134m 1.9m/s 2m/s
Sun, Apr 19 Sunrise 06:04 Sunset 20:09
24:00
100% 2.2°C 0mm 89% 0cm -25° 3.9°C 0mm 0.09kPa 24135m 1.9m/s 2m/s
01:00
100% 2°C 0mm 90% 0cm -27° 3.5°C 0mm 0.08kPa 24135m 2.1m/s 2.1m/s
02:00
93% 1.8°C 0mm 91% 0cm -26° 3.1°C 0mm 0.07kPa 24135m 2.1m/s 2.1m/s
03:00
85% 1.5°C 0mm 92% 0cm -22° 2.7°C 0mm 0.06kPa 24135m 2m/s 2.1m/s
04:00
78% 1.4°C 0mm 92% 0cm -17° 2.5°C 0mm 0.06kPa 24135m 1.9m/s 2m/s
05:00
79% 1°C 0mm 92% 0cm -9.4° 2.1°C 0mm 0.06kPa 24135m 2.1m/s 2m/s
06:00
79% 0.7°C 0mm 92% 0cm -0.85° 1.9°C 0mm 0.06kPa 24134m 2.1m/s 2m/s
07:00
80% 1.4°C 0mm 91% 0cm 7.9° 2.7°C 0mm 0.07kPa 24134m 2.8m/s 2m/s
08:00
73% 2.6°C 0mm 86% 0cm 17° 4.7°C 0mm 0.11kPa 24135m 6m/s 2.3m/s
09:00
66% 3.4°C 0mm 82% 0cm 26° 6.3°C 0mm 0.17kPa 24134m 5.6m/s 3.1m/s
10:00
59% 3.7°C 0mm 76% 0cm 35° 7.7°C 0mm 0.25kPa 24134m 5.4m/s 3.8m/s
11:00
49% 3.2°C 0mm 66% 0cm 42° 9.4°C 0mm 0.41kPa 24134m 4.7m/s 3.5m/s
12:00
38% 2.5°C 0mm 58% 0cm 47° 11°C 0mm 0.54kPa 24135m 4.3m/s 3.2m/s
13:00
28% 2.3°C 0mm 54% 0cm 49° 11°C 0mm 0.62kPa 24134m 4.3m/s 3.3m/s
14:00
26% 2.4°C 0mm 52% 0cm 48° 12°C 0mm 0.66kPa 24135m 4.2m/s 3.4m/s
15:00
24% 2.7°C 0mm 52% 0cm 43° 12°C 0mm 0.68kPa 24135m 4.2m/s 3.5m/s
16:00
22% 2.8°C 0mm 52% 0cm 36° 12°C 0mm 0.68kPa 24134m 4.2m/s 3.4m/s
17:00
21% 3.1°C 0mm 54% 0cm 28° 12°C 0mm 0.66kPa 24134m 4m/s 3.1m/s
18:00
20% 4.7°C 0mm 61% 0cm 19° 12°C 0mm 0.54kPa 24134m 3.3m/s 2.3m/s
19:00
19% 5.4°C 0mm 72% 0cm 9.9° 10°C 0mm 0.35kPa 24134m 2.3m/s 1.8m/s
20:00
33% 3°C 0mm 75% 0cm 1.2° 7.2°C 0mm 0.26kPa 24134m 1.6m/s 1.6m/s
21:00
48% 2.6°C 0mm 81% 0cm -7.6° 5.7°C 0mm 0.18kPa 24134m 1.5m/s 1.5m/s
22:00
62% 2.1°C 0mm 82% 0cm -15° 4.9°C 0mm 0.16kPa 24135m 2.1m/s 2m/s
23:00
62% 2°C 0mm 85% 0cm -21° 4.4°C 0mm 0.13kPa 24134m 2.2m/s 2.1m/s
Mon, Apr 20 Sunrise 06:02 Sunset 20:11
24:00
62% 2°C 0mm 86% 0cm -25° 4.1°C 0mm 0.11kPa 24135m 2m/s 2m/s
01:00
62% 1.9°C 0mm 86% 0cm -27° 4°C 0mm 0.11kPa 24134m 1.2m/s 1.2m/s
02:00
64% 1.5°C 0mm 88% 0cm -26° 3.3°C 0mm 0.1kPa 24135m 0.5m/s 0.4m/s
03:00
67% 1°C 0mm 88% 0cm -22° 2.7°C 0mm 0.09kPa 24135m 0.81m/s 0.82m/s
04:00
69% 1°C 0mm 90% 0cm -16° 2.4°C 0mm 0.07kPa 24134m 1.4m/s 1.5m/s
05:00
68% 0.8°C 0mm 91% 0cm -9.1° 2.1°C 0mm 0.06kPa 24135m 1.1m/s 1m/s
06:00
68% 0.7°C 0mm 90% 0cm -0.44° 2.1°C 0mm 0.07kPa 24134m 0.81m/s 0.71m/s
07:00
67% 2.1°C 0mm 90% 0cm 8.2° 3.6°C 0mm 0.08kPa 24134m 0.7m/s 0.62m/s
08:00
60% 3.1°C 0mm 83% 0cm 17° 5.9°C 0mm 0.16kPa 24134m 0.9m/s 0.46m/s
09:00
53% 3.5°C 0mm 79% 0cm 27° 6.8°C 0mm 0.2kPa 24135m 1.3m/s 0.97m/s
10:00
46% 3.2°C 0mm 76% 0cm 35° 7.3°C 0.06mm 0.25kPa 24135m 1.9m/s 1.6m/s
11:00
42% 2.8°C 0mm 72% 0cm 42° 7.6°C 0.06mm 0.29kPa 24134m 2.1m/s 1.9m/s
12:00
38% 2.8°C 0mm 68% 0cm 48° 8.5°C 0.06mm 0.36kPa 24134m 1.8m/s 1.8m/s
13:00
34% 2.8°C 0mm 62% 0cm 50° 9.7°C 0.06mm 0.45kPa 24135m 2.1m/s 2m/s
14:00
23% 2.5°C 0mm 56% 0cm 48° 11°C 0mm 0.57kPa 24135m 2.9m/s 2.4m/s
15:00
13% 2.6°C 0mm 55% 0cm 44° 11°C 0mm 0.6kPa 24134m 2.9m/s 2.4m/s
16:00
2% 2.8°C 0mm 56% 0cm 37° 11°C 0mm 0.59kPa 24134m 2.6m/s 2m/s
17:00
3% 3.7°C 0mm 60% 0cm 28° 11°C 0.13mm 0.53kPa 21806m 2.3m/s 2.3m/s
18:00
3% 5.5°C 0mm 74% 0cm 19° 9.8°C 0.38mm 0.31kPa 20165m 3.1m/s 2.9m/s
19:00
4% 5.8°C 0mm 83% 0cm 10° 8.5°C 0.63mm 0.19kPa 22744m 2m/s 1.7m/s
20:00
16% 4.8°C 0mm 88% 0cm 1.4° 6.7°C 0.42mm 0.12kPa 23208m 3.4m/s 2.1m/s
21:00
27% 3.7°C 0mm 93% 0cm -7.3° 4.8°C 0.21mm 0.06kPa 23671m 4.8m/s 2.4m/s
22:00
39% 2.6°C 0mm 97% 0cm -15° 3°C 0mm 0.02kPa 24135m 6.1m/s 2.7m/s
23:00
39% 2.6°C 0mm 97% 0cm -21° 3°C 0mm 0.02kPa 24135m 7.8m/s 2.9m/s
Tue, Apr 21 Sunrise 06:00 Sunset 20:12
24:00
38% 2.7°C 0mm 97% 0cm -25° 3°C 0mm 0.02kPa 24135m 9.5m/s 3m/s
01:00
38% 2.7°C 0mm 97% 0cm -26° 3.1°C 0mm 0.02kPa 24135m 11m/s 3.2m/s
02:00
37% 3.5°C 0mm 89% 0cm -25° 5.1°C 0mm 0.09kPa 24135m 10m/s 4.3m/s
03:00
35% 4.1°C 0mm 81% 0cm -22° 7.2°C 0mm 0.19kPa 24135m 9.6m/s 5.4m/s
04:00
34% 4.6°C 0mm 73% 0cm -16° 9.2°C 0mm 0.31kPa 24135m 8.8m/s 6.5m/s
05:00
28% 4.9°C 0mm 72% 0cm -8.8° 9.7°C 0.02mm 0.33kPa 24135m 8.9m/s 6.8m/s
06:00
22% 5.2°C 0mm 71% 0cm 0.04° 10°C 0.04mm 0.35kPa 24135m 8.9m/s 7m/s
07:00
16% 5.5°C 0mm 71% 0cm 8.5° 11°C 0.06mm 0.38kPa 24135m 9m/s 7.3m/s
08:00
12% 5.1°C 0mm 67% 0cm 18° 11°C 0.04mm 0.44kPa 24135m 9.2m/s 7.3m/s
09:00
8% 4.6°C 0mm 63% 0cm 27° 11°C 0.02mm 0.51kPa 24135m 9.4m/s 7.3m/s
10:00
4% 4°C 0mm 58% 0cm 35° 12°C 0mm 0.58kPa 24135m 9.6m/s 7.3m/s
11:00
4% 4.2°C 0mm 62% 0cm 43° 11°C 0mm 0.5kPa 24135m 10m/s 7.2m/s
12:00
3% 4.3°C 0mm 66% 0cm 48° 10°C 0mm 0.43kPa 24135m 11m/s 7.2m/s
13:00
3% 4.4°C 0mm 70% 0cm 50° 9.6°C 0mm 0.36kPa 24135m 12m/s 7.2m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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