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Rule Fog Hunter

Bretton Woods - Fog Hunter - New England, USA

Bretton Woods, New Hampshire, United States

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread5.7°C
Visibility24135 (Clear)
Relative Humidity68%
Wind Speed5.0m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/New_York
fog weather icon
Next opportunity
Dense Fog
Bretton Woods
Tomorrow · 21:00–05:00 · 8h window
High confidence
87%
🌫️Fog Probability72.7-98.5%
Dewpoint Spread: 0.2°C
Visibility: 10779 (Clear)
Relative Humidity: 99%
Wind Speed: 1.3m/s (calm conditions)
fog weather icon
Moderate Fog at Sunrise
Bretton Woods
Mon, Apr 20 · 05:00–07:00
🌫️Fog Probability:60.7-79.7%
Medium
fog weather icon
Dense Fog
Bretton Woods
Mon, Apr 20 · 23:00–24:00
🌫️Fog Probability:89.8%
Medium
fog weather icon
Moderate Fog
Bretton Woods
Wed, Apr 22 · 17:00–19:00
🌫️Fog Probability:74.8-77.9%
Medium
fog weather icon
Dense Fog at Sunset
Bretton Woods
Wed, Apr 22 · 19:00–20:00
🌫️Fog Probability:93.6%
Medium
fog weather icon
Dense Fog at Dusk
Bretton Woods
Wed, Apr 22 · 20:00–21:00
🌫️Fog Probability:88.6%
Medium
fog weather icon
Dense Fog
Bretton Woods
Wed, Apr 22 · 21:00–24:00
🌫️Fog Probability:88.6-93.6%
High
+4 more windows in the next 10 days

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the maritime fog and mountain mist that define New England's atmospheric photography. We combine ocean temperature, dewpoint, and topography to predict when coastal fog banks and mountain valley mist will create moody, quintessentially New England conditions.

New England sits where cold Atlantic waters meet the North American continent, creating persistent fog conditions especially during autumn. The region's mountains—from the White Mountains of New Hampshire to the Green Mountains of Vermont—also generate valley fog that transforms familiar scenes into ethereal compositions.

What makes New England fog photography exceptional:

  • Maritime fog - Cold Atlantic waters generate thick fog banks that roll inland, especially in Maine and coastal Massachusetts
  • White Mountains valleys - Notches and valleys trap morning mist that burns off by mid-morning, creating dramatic reveal moments
  • Covered bridge fog - Vermont and New Hampshire's iconic covered bridges emerge from fog like scenes from another century
  • Acadia coastal mist - Rocky Maine coast where fog meets granite cliffs and crashing waves

Best conditions occur September through October when warm land meets cooling air. Coastal fog can persist all day, while mountain valley fog typically burns off by late morning. Classic locations include Franconia Notch, Smugglers' Notch, and Mount Desert Island.

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72-hour requirements breakdown

What passed or failed, hour by hour
12matching hours in the next 86 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/New_York
Fog Probability
≥ 60.0%
Sat, Apr 18
24:000%
01:000%
02:000%
03:000%
04:0044%
05:0063%
06:0037%
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%
22:0031%
23:0029%
Sun, Apr 19
24:000%
01:0021%
02:0029%
03:0031%
04:0039%
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%
21:0073%
22:0097%
23:0099%
Mon, Apr 20
24:0099%
01:0094%
02:0090%
03:0090%
04:0078%
05:0080%
06:0061%
07:0051%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:0011%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:0044%
23:0090%
Tue, Apr 21
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%
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
America/New_York
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 05:57 Sunset 19:33
15:00
43% 6.3°C 0mm 68% 0cm 46° 12°C 0mm 0.44kPa 24135m 7.9m/s 5m/s
16:00
24% 5.7°C 0mm 71% 0cm 37° 11°C 0mm 0.38kPa 24134m 7.5m/s 4.9m/s
17:00
5% 5.1°C 0mm 74% 0cm 26° 9.6°C 0mm 0.32kPa 24135m 7.3m/s 4.7m/s
18:00
3% 3.8°C 0mm 70% 0cm 16° 9.1°C 0mm 0.35kPa 24135m 7.1m/s 4.3m/s
19:00
2% 2.9°C 0mm 72% 0cm 5.2° 7.6°C 0mm 0.29kPa 24134m 7.3m/s 4m/s
20:00
0% 2.5°C 0mm 81% 0cm -5.2° 5.5°C 0mm 0.17kPa 24135m 6.1m/s 3.7m/s
21:00
0% 2.6°C 0mm 88% 0cm -15° 4.4°C 0mm 0.1kPa 24135m 7.2m/s 4.3m/s
22:00
0% 3.1°C 0mm 94% 0cm -23° 3.9°C 0mm 0.05kPa 5829m 6.6m/s 3.8m/s
23:00
0% 3.2°C 0mm 93% 0cm -30° 4.2°C 0mm 0.06kPa 6333m 6.7m/s 4m/s
Sun, Apr 19 Sunrise 05:55 Sunset 19:34
24:00
0% 3.1°C 0mm 93% 0cm -34° 4.2°C 0mm 0.06kPa 5974m 6.4m/s 4m/s
01:00
0% 3.4°C 0mm 92% 0cm -34° 4.5°C 0mm 0.06kPa 2772m 7.2m/s 3.9m/s
02:00
0% 3.7°C 0mm 93% 0cm -32° 4.6°C 0mm 0.06kPa 3275m 6.4m/s 3.5m/s
03:00
0% 4.4°C 0.06mm 94% 0cm -27° 5.3°C 0.13mm 0.05kPa 3901m 7m/s 3.6m/s
04:00
0% 5.1°C 0.19mm 97% 0cm -19° 5.5°C 0.88mm 0.03kPa 2253m 6.2m/s 3.4m/s
05:00
0% 5.1°C 0.76mm 97% 0cm -10° 5.6°C 1.4mm 0.03kPa 1484m 7.1m/s 3.8m/s
06:00
0% 5°C 0.37mm 97% 0cm 0.45° 5.5°C 1.8mm 0.03kPa 1616m 7.4m/s 3.7m/s
07:00
0% 5.2°C 0.6mm 97% 0cm 11° 5.6°C 2.5mm 0.03kPa 1680m 6.5m/s 3.2m/s
08:00
0% 5.4°C 0.53mm 98% 0cm 21° 5.8°C 3.9mm 0.02kPa 2246m 4.7m/s 2.2m/s
09:00
0% 5.7°C 3.5mm 99% 0cm 32° 5.9°C 3.6mm 0.01kPa 155m 2.7m/s 1.8m/s
10:00
0% 4.5°C 3.5mm 99% 0cm 42° 4.7°C 5.9mm 0.01kPa 123m 3.3m/s 2.5m/s
11:00
0% 2.8°C 2mm 99% 0cm 50° 2.9°C 8.5mm 0.01kPa 176m 4.6m/s 3.2m/s
12:00
0% 1.1°C 4.6mm 100% 4.6cm 56° 1.2°C 11mm 0kPa 29m 3.7m/s 2.5m/s
13:00
0% 0.7°C 0.99mm 99% 1cm 57° 0.81°C 14mm 0kPa 29m 4.5m/s 2.9m/s
14:00
0% -0.3°C 1.5mm 99% 1.6cm 53° -0.17°C 16mm 0.01kPa 65m 5.7m/s 3.2m/s
15:00
0% -1.1°C 2.2mm 98% 2.3cm 46° -0.86°C 2.3mm 0.01kPa 90m 5.8m/s 3.3m/s
16:00
0% -1.7°C 0.7mm 98% 0.76cm 37° -1.4°C 3.6mm 0.01kPa 123m 6.5m/s 3.3m/s
17:00
0% -1.6°C 0.34mm 95% 0.44cm 27° -0.93°C 4.2mm 0.03kPa 997m 9m/s 4m/s
18:00
0% -1.2°C 0.06mm 97% 0.21cm 16° -0.77°C 4.8mm 0.02kPa 1319m 10m/s 3.7m/s
19:00
0% -1.6°C 0.01mm 94% 0.08cm 5.4° -0.84°C 4.8mm 0.03kPa 8180m 10m/s 3.4m/s
20:00
0% -2.3°C 0.01mm 97% 0.04cm -5° -1.9°C 4.9mm 0.02kPa 7211m 9m/s 2.7m/s
21:00
15% -2.8°C 0mm 97% 0cm -15° -2.4°C 0mm 0.01kPa 24134m 7.8m/s 2.2m/s
22:00
30% -4.1°C 0mm 99% 0cm -23° -3.9°C 0mm 0.01kPa 19402m 2.2m/s 1.3m/s
23:00
45% -4.9°C 0mm 99% 0cm -29° -4.7°C 0mm 0.01kPa 10779m 1.2m/s 1.3m/s
Mon, Apr 20 Sunrise 05:53 Sunset 19:36
24:00
44% -4.5°C 0mm 98% 0.09cm -33° -4.2°C 0.06mm 0.01kPa 9160m 1.5m/s 1.2m/s
01:00
42% -5.4°C 0mm 98% 0cm -34° -5.1°C 0.06mm 0.01kPa 18235m 1.4m/s 1.3m/s
02:00
41% -5.5°C 0mm 98% 0cm -32° -5.2°C 0.06mm 0.01kPa 9807m 1.3m/s 1.3m/s
03:00
45% -4.7°C 0mm 97% 0cm -26° -4.3°C 0mm 0.01kPa 13848m 0.7m/s 0.74m/s
04:00
50% -4.5°C 0mm 96% 0.07cm -19° -4°C 0.06mm 0.02kPa 21792m 0.9m/s 0.92m/s
05:00
54% -4.8°C 0mm 97% 0.04cm -9.7° -4.3°C 0.13mm 0.01kPa 8863m 0.91m/s 0.85m/s
06:00
48% -4.3°C 0.18mm 98% 0.22cm 0.7° -4°C 0.25mm 0.01kPa 193m 1.6m/s 1.2m/s
07:00
41% -2.5°C 0.3mm 96% 0.39cm 11° -2°C 0.63mm 0.02kPa 155m 3.1m/s 1.5m/s
08:00
35% -2.6°C 0.38mm 94% 0.58cm 22° -1.6°C 1.1mm 0.04kPa 277m 3.2m/s 1.5m/s
09:00
25% -1.8°C 0.74mm 95% 1.3cm 32° -1.1°C 1.1mm 0.03kPa 159m 4m/s 2.4m/s
10:00
16% -2.5°C 0.42mm 93% 0.7cm 42° -1.5°C 2.2mm 0.04kPa 354m 4.7m/s 3.3m/s
11:00
6% -3.4°C 0.03mm 85% 0.14cm 50° -1.2°C 2.6mm 0.09kPa 2680m 4.6m/s 2.9m/s
12:00
5% -3.7°C 0.02mm 78% 0.1cm 56° -0.39°C 2.7mm 0.13kPa 6174m 4.5m/s 2.7m/s
13:00
3% -2.6°C 0.03mm 83% 0.34cm 57° -0.06°C 2.9mm 0.1kPa 1922m 5m/s 3.1m/s
14:00
2% -1.9°C 0.2mm 90% 0.7cm 54° -0.48°C 3.3mm 0.06kPa 597m 5.7m/s 3.5m/s
15:00
3% -2.2°C 0.29mm 91% 0.75cm 46° -0.87°C 0.81mm 0.05kPa 499m 6.7m/s 3.8m/s
16:00
3% -2.5°C 0.34mm 91% 0.71cm 37° -1.3°C 1.6mm 0.05kPa 495m 7.7m/s 4m/s
17:00
4% -3.5°C 0.12mm 87% 0.26cm 27° -1.7°C 2mm 0.07kPa 2024m 7.4m/s 3.9m/s
18:00
6% -3.7°C 0.02mm 87% 0.12cm 16° -1.9°C 2.2mm 0.07kPa 7226m 7.1m/s 3.9m/s
19:00
7% -4.9°C 0mm 88% 0.06cm 5.6° -3.1°C 2.3mm 0.06kPa 24134m 7.4m/s 3.6m/s
20:00
9% -7.2°C 0mm 95% 0.04cm -4.7° -6.5°C 2.3mm 0.02kPa 24135m 3.8m/s 1.4m/s
21:00
30% -7.4°C 0mm 96% 0.03cm -14° -6.9°C 1.5mm 0.02kPa 19486m 2.7m/s 1m/s
22:00
51% -7.7°C 0mm 97% 0.01cm -23° -7.3°C 0.77mm 0.01kPa 14838m 1.6m/s 0.72m/s
23:00
72% -8°C 0mm 98% 0cm -29° -7.7°C 0mm 0.01kPa 10189m 0.42m/s 0.4m/s
Tue, Apr 21 Sunrise 05:52 Sunset 19:37
24:00
73% -7°C 0mm 92% 0cm -33° -5.8°C 0mm 0.03kPa 14838m 0.72m/s 0.62m/s
01:00
73% -6.1°C 0mm 86% 0cm -34° -4°C 0mm 0.07kPa 19487m 1m/s 0.84m/s
02:00
74% -5.2°C 0mm 79% 0cm -31° -2.1°C 0mm 0.11kPa 24135m 1.3m/s 1.1m/s
03:00
76% -5.3°C 0mm 70% 0cm -26° -0.6°C 0mm 0.17kPa 24135m 1.6m/s 1.3m/s
04:00
79% -5.7°C 0mm 61% 0cm -18° 0.94°C 0mm 0.25kPa 24135m 1.8m/s 1.5m/s
05:00
81% -6.3°C 0mm 52% 0cm -9.4° 2.5°C 0mm 0.35kPa 24135m 2m/s 1.7m/s
06:00
82% -6.1°C 0mm 50% 0cm 0.94° 3.5°C 0mm 0.39kPa 24135m 2.1m/s 1.6m/s
07:00
83% -5.9°C 0mm 47% 0cm 11° 4.5°C 0mm 0.45kPa 24135m 2.2m/s 1.5m/s
08:00
84% -5.8°C 0mm 44% 0cm 22° 5.4°C 0mm 0.5kPa 24135m 2.2m/s 1.4m/s
09:00
77% -6°C 0mm 44% 0cm 32° 5.3°C 0mm 0.5kPa 24135m 2.6m/s 1.7m/s
10:00
71% -6.2°C 0mm 44% 0cm 42° 5.2°C 0mm 0.5kPa 24135m 3m/s 2m/s
11:00
64% -6.4°C 0mm 44% 0cm 51° 5°C 0mm 0.49kPa 24135m 3.4m/s 2.3m/s
12:00
53% -4.8°C 0mm 56% 0cm 56° 3.1°C 0mm 0.33kPa 24135m 2.7m/s 2.1m/s
13:00
42% -3.9°C 0mm 69% 0cm 58° 1.2°C 0mm 0.21kPa 24135m 2.1m/s 1.9m/s
14:00
31% -3.4°C 0mm 82% 0cm 54° -0.68°C 0mm 0.11kPa 24135m 1.4m/s 1.7m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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