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Rule Morning Frost

Bar Harbor - Morning Frost - New England, USA

Bar Harbor, Maine, United States

Frost crystals on calm, cold mornings near sunrise

No opportunities right now
Here’s what usually blocks matches

No Morning Frost opportunities in the next 14 days

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Rule requirements (key thresholds)
Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Wind Speed · ≤ 1.5m/s

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Frost Probability 100% failing
Time Window 88% failing
Wind Speed 74% failing

Currently

Real-time conditions
Soil Temperature16.8°C
Dew Point14.7°C (moderate dew point)
Wind Speed1.6m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/New_York

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts the first frost events that transform New England's fall foliage into crystalline masterpieces. We track overnight temperatures, dewpoint, and wind conditions to identify when frost will coat leaves, grasses, and stone walls with sparkling ice crystals.

The first hard frost of autumn is a cherished event in New England—it triggers the final phase of fall color and creates magical dawn conditions where ice crystals catch golden light. The region's iconic stone walls, covered bridges, and sugar maples take on new dimension when dusted with frost.

What makes New England frost photography exceptional:

  • Foliage enhancement - Frost crystals on red and orange leaves create otherworldly textures and highlights
  • Stone wall character - New England's ubiquitous dry-stacked stone walls gain definition and drama when frost-covered
  • Sugar maple groves - Vermont and New Hampshire maple stands combine brilliant color with frost textures
  • Historic elements - Colonial-era buildings, covered bridges, and farmsteads gain timeless quality under frost

Best conditions occur on clear, calm nights in October when temperatures drop to 28-32°F. Frost melts quickly after sunrise, so arrive before dawn for frost plus golden hour light. Protected valleys and hollows accumulate frost more heavily than exposed hilltops.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/New_York
Time Window
Sunrise -45m to +90m
Frost Probability
≥ 60.0%
Wind Speed
≤ 1.5m/s
Wed, Jul 8
24:000%0.73m/s
01:000%1m/s
02:000%1.3m/s
03:000%0.57m/s
04:000%0.55m/s
05:000%0.74m/s
06:000%1.4m/s
07:000%1.2m/s
08:000%1.5m/s
09:000%1.7m/s
10:000%1.6m/s
11:000%2m/s
12:000%2.5m/s
13:000%3.6m/s
14:000%3.6m/s
15:000%3.8m/s
16:000%3.7m/s
17:000%3.9m/s
18:000%3.1m/s
19:000%2.5m/s
20:000%1.9m/s
21:000%1.8m/s
22:000%1.5m/s
23:000%1.1m/s
Thu, Jul 9
24:000%1.6m/s
01:000%1.6m/s
02:000%1.7m/s
03:000%1.6m/s
04:000%1.5m/s
05:000%1.4m/s
06:000%1.3m/s
07:000%2m/s
08:000%1.7m/s
09:000%2.3m/s
10:000%2.4m/s
11:000%3m/s
12:000%3.3m/s
13:000%3.7m/s
14:000%4m/s
15:000%4m/s
16:000%2.1m/s
17:000%0.57m/s
18:000%0.37m/s
19:000%1.1m/s
20:000%0.96m/s
21:000%0.62m/s
22:000%1.4m/s
23:000%1.9m/s
Fri, Jul 10
24:000%1m/s
01:000%1m/s
02:000%1.7m/s
03:000%1.5m/s
04:000%1.1m/s
05:000%1.2m/s
06:000%0.54m/s
07:000%0.83m/s
08:000%0.81m/s
09:000%1.8m/s
10:000%2.4m/s
11:000%3.1m/s
12:000%2.4m/s
13:000%0.93m/s
14:000%1.4m/s
15:000%1.6m/s
16:000%1.8m/s
17:000%2.1m/s
18:000%2.3m/s
19:000%2.6m/s
20:000%2.9m/s
21:000%3.1m/s
22:000%3.3m/s
23:000%3.4m/s
Sat, Jul 11
24:000%3.7m/s
01:000%3.9m/s
02:000%4.2m/s
03:000%4.2m/s
04:000%4.2m/s
05:000%4.2m/s
06:000%3.8m/s
07:000%3.3m/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
America/New_York
Dew Point
°C
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Wed, Jul 8 Sunrise 04:57 Sunset 20:18
10:00
15°C 17°C 19°C - 100% 0.57kPa
11:00
15°C 17°C 19°C - 81% 0.6kPa
12:00
14°C 17°C 20°C - 33% 0.72kPa
13:00
14°C 17°C 21°C - 56% 0.92kPa
14:00
14°C 17°C 22°C - 95% 0.96kPa
15:00
14°C 18°C 22°C - 1% 0.94kPa
16:00
14°C 18°C 21°C - 44% 0.91kPa
17:00
13°C 18°C 20°C - 100% 0.75kPa
18:00
13°C 18°C 18°C - 100% 0.59kPa
19:00
13°C 18°C 16°C - 100% 0.39kPa
20:00
12°C 18°C 14°C - 80% 0.19kPa
21:00
12°C 18°C 13°C - 5% 0.12kPa
22:00
11°C 17°C 13°C - 5% 0.13kPa
23:00
11°C 17°C 13°C - 84% 0.15kPa
Thu, Jul 9 Sunrise 04:57 Sunset 20:17
24:00
11°C 17°C 13°C - 94% 0.21kPa
01:00
11°C 17°C 13°C - 100% 0.2kPa
02:00
11°C 17°C 13°C - 100% 0.16kPa
03:00
12°C 17°C 13°C - 90% 0.11kPa
04:00
12°C 16°C 13°C - 100% 0.07kPa
05:00
12°C 16°C 13°C - 93% 0.07kPa
06:00
13°C 16°C 14°C - 27% 0.14kPa
07:00
14°C 16°C 17°C - 20% 0.37kPa
08:00
14°C 16°C 19°C - 5% 0.57kPa
09:00
15°C 16°C 21°C - 28% 0.83kPa
10:00
16°C 17°C 23°C - 8% 1.1kPa
11:00
16°C 17°C 25°C - 5% 1.4kPa
12:00
16°C 17°C 26°C - 5% 1.5kPa
13:00
16°C 17°C 27°C - 71% 1.7kPa
14:00
16°C 18°C 27°C - 97% 1.8kPa
15:00
17°C 18°C 26°C - 89% 1.4kPa
16:00
17°C 18°C 24°C - 88% 1.1kPa
17:00
18°C 18°C 22°C - 40% 0.65kPa
18:00
18°C 19°C 23°C - 10% 0.82kPa
19:00
18°C 19°C 22°C - 11% 0.61kPa
20:00
17°C 19°C 19°C - 47% 0.27kPa
21:00
17°C 19°C 18°C - 90% 0.18kPa
22:00
17°C 19°C 18°C - 100% 0.12kPa
23:00
17°C 18°C 18°C - 40% 0.04kPa
Fri, Jul 10 Sunrise 04:58 Sunset 20:17
24:00
17°C 18°C 17°C - 100% 0.02kPa
01:00
16°C 18°C 16°C - 100% 0.01kPa
02:00
16°C 18°C 16°C - 100% 0.01kPa
03:00
16°C 18°C 16°C - 100% 0.01kPa
04:00
16°C 18°C 16°C - 97% 0.02kPa
05:00
17°C 18°C 17°C - 100% 0.02kPa
06:00
17°C 18°C 17°C - 100% 0.03kPa
07:00
18°C 18°C 18°C - 100% 0.07kPa
08:00
18°C 18°C 18°C - 99% 0.07kPa
09:00
18°C 18°C 20°C - 100% 0.25kPa
10:00
18°C 18°C 23°C - 100% 0.76kPa
11:00
17°C 18°C 24°C - 88% 1.1kPa
12:00
16°C 18°C 25°C - 99% 1.3kPa
13:00
16°C 19°C 26°C - 100% 1.5kPa
14:00
15°C 19°C 27°C - 100% 1.8kPa
15:00
17°C 19°C 24°C - 100% 1.1kPa
16:00
17°C 19°C 21°C - 100% 0.59kPa
17:00
17°C 18°C 19°C - 100% 0.2kPa
18:00
16°C 18°C 18°C - 100% 0.18kPa
19:00
16°C 18°C 17°C - 100% 0.16kPa
20:00
15°C 18°C 16°C - 100% 0.14kPa
21:00
14°C 18°C 15°C - 94% 0.16kPa
22:00
13°C 18°C 15°C - 89% 0.18kPa
23:00
13°C 17°C 14°C - 83% 0.19kPa
Sat, Jul 11 Sunrise 04:59 Sunset 20:16
24:00
12°C 17°C 16°C - 56% 0.39kPa
01:00
11°C 17°C 17°C - 28% 0.63kPa
02:00
10°C 17°C 19°C - 0% 0.9kPa
03:00
10°C 17°C 20°C - 2% 1.1kPa
04:00
9.6°C 17°C 21°C - 3% 1.4kPa
05:00
9°C 18°C 23°C - 5% 1.6kPa
06:00
9°C 18°C 23°C - 7% 1.7kPa
07:00
8.9°C 18°C 24°C - 9% 1.8kPa
08:00
8.8°C 18°C 24°C - 12% 1.9kPa
09:00
10°C 18°C 23°C - 35% 1.5kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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