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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
Wind Speed 89% failing
Time Window 88% failing

Currently

Real-time conditions
Soil Temperature9.5°C
Dew Point1.3°C (low dew point)
Wind Speed2.2m/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 95 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
Sat, May 23
09:000%2m/s
10:000%1.9m/s
11:000%2m/s
12:000%3.4m/s
13:000%4.1m/s
14:000%4.2m/s
15:000%3.6m/s
16:000%3.1m/s
17:000%2.8m/s
18:000%2.4m/s
19:000%2.1m/s
20:000%1.9m/s
21:000%1.7m/s
22:000%1.4m/s
23:000%0.9m/s
Sun, May 24
24:000%0.78m/s
01:000%0.72m/s
02:000%0.4m/s
03:000%0.7m/s
04:000%0.73m/s
05:000%0.72m/s
06:000%0.83m/s
07:000%1.1m/s
08:000%1.4m/s
09:000%2.2m/s
10:000%2.7m/s
11:000%2.9m/s
12:000%3.2m/s
13:000%3.3m/s
14:000%3.2m/s
15:000%2.8m/s
16:000%2.6m/s
17:000%2.8m/s
18:000%2.2m/s
19:000%1.5m/s
20:000%1.6m/s
21:000%1.7m/s
22:000%1.9m/s
23:000%1.5m/s
Mon, May 25
24:000%1.8m/s
01:000%2m/s
02:000%2.1m/s
03:000%2.4m/s
04:000%3.1m/s
05:000%3.7m/s
06:000%4.5m/s
07:000%4.9m/s
08:000%4.6m/s
09:000%5.5m/s
10:000%5.6m/s
11:000%3.4m/s
12:000%2.6m/s
13:000%1.6m/s
14:000%1.5m/s
15:000%1.3m/s
16:000%1.7m/s
17:000%2.9m/s
18:000%3.7m/s
19:000%3.2m/s
20:000%3.6m/s
21:000%2.4m/s
22:000%1.9m/s
23:000%1.7m/s
Tue, May 26
24:000%1.8m/s
01:000%2.1m/s
02:000%2.4m/s
03:000%2.2m/s
04:000%1.9m/s
05:000%1.8m/s
06:000%1.7m/s
07:000%1.6m/s
08:000%1.3m/s
09:000%1.5m/s
10:000%1.3m/s
11:000%2.2m/s
12:000%3.1m/s
13:000%3.7m/s
14:000%4.5m/s
15:000%4.3m/s
16:000%4.1m/s
17:000%3.9m/s
18:000%3.1m/s
19:000%2.2m/s
20:000%1.3m/s
21:000%1.5m/s
22:000%1.8m/s
23:000%2m/s
Wed, May 27
24:000%3m/s
01:000%4m/s
02:000%5m/s
03:000%5.1m/s
04:000%5.2m/s
05:000%5.3m/s
06:000%5.1m/s
07:000%4.9m/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
Sun, May 24 Sunrise 04:57 Sunset 20:02
09:00
1.3°C 9.5°C 12°C - 100% 0.73kPa
10:00
0.6°C 9.6°C 12°C - 100% 0.79kPa
11:00
0.3°C 9.8°C 12°C - 100% 0.79kPa
12:00
0.1°C 10°C 13°C - 100% 0.83kPa
13:00
0.2°C 10°C 12°C - 100% 0.81kPa
14:00
0.4°C 10°C 12°C - 100% 0.81kPa
15:00
0.6°C 10°C 12°C - 100% 0.76kPa
16:00
1.1°C 10°C 11°C - 100% 0.67kPa
17:00
1.5°C 10°C 11°C - 100% 0.6kPa
18:00
2.9°C 10°C 9.6°C - 100% 0.45kPa
19:00
3.5°C 10°C 8.7°C - 100% 0.34kPa
20:00
3.8°C 10°C 8.3°C - 100% 0.29kPa
21:00
3.9°C 10°C 8.3°C - 100% 0.28kPa
22:00
4.1°C 9.8°C 8.3°C - 100% 0.28kPa
23:00
4.4°C 9.7°C 8.3°C - 100% 0.26kPa
Mon, May 25 Sunrise 04:56 Sunset 20:03
24:00
5°C 9.6°C 8.2°C - 100% 0.21kPa
01:00
5.9°C 9.5°C 8°C - 100% 0.14kPa
02:00
6.5°C 9.4°C 7.9°C - 100% 0.09kPa
03:00
7°C 9.3°C 8°C - 100% 0.07kPa
04:00
7.4°C 9.2°C 8.1°C - 100% 0.05kPa
05:00
7.8°C 9.2°C 8.3°C - 100% 0.04kPa
06:00
8.3°C 9.1°C 8.8°C - 100% 0.04kPa
07:00
8.6°C 9.1°C 8.9°C - 100% 0.02kPa
08:00
8.7°C 9.1°C 8.9°C - 100% 0.02kPa
09:00
8.9°C 9.1°C 9.1°C - 100% 0.02kPa
10:00
9.1°C 9.1°C 9.3°C - 100% 0.02kPa
11:00
9.1°C 9.1°C 9.3°C - 100% 0.01kPa
12:00
9.4°C 9.1°C 9.5°C - 100% 0.01kPa
13:00
9.4°C 9.1°C 9.5°C - 100% 0.01kPa
14:00
9.5°C 9.1°C 9.6°C - 100% 0.01kPa
15:00
9.7°C 9.1°C 9.9°C - 100% 0.02kPa
16:00
10°C 9.2°C 11°C - 100% 0.03kPa
17:00
10°C 9.3°C 11°C - 100% 0.09kPa
18:00
11°C 9.4°C 12°C - 100% 0.13kPa
19:00
11°C 9.4°C 12°C - 98% 0.11kPa
20:00
10°C 9.5°C 12°C - 94% 0.14kPa
21:00
10°C 9.6°C 11°C - 95% 0.11kPa
22:00
9.9°C 9.5°C 11°C - 100% 0.09kPa
23:00
9.8°C 9.5°C 11°C - 100% 0.07kPa
Tue, May 26 Sunrise 04:55 Sunset 20:04
24:00
9.4°C 9.5°C 10°C - 100% 0.05kPa
01:00
8.9°C 9.5°C 9.4°C - 100% 0.04kPa
02:00
8.6°C 9.5°C 9°C - 100% 0.03kPa
03:00
8.3°C 9.4°C 8.7°C - 100% 0.03kPa
04:00
8°C 9.2°C 8.5°C - 100% 0.03kPa
05:00
7.9°C 9.1°C 8.4°C - 100% 0.04kPa
06:00
8.5°C 9.1°C 9.2°C - 100% 0.05kPa
07:00
9.3°C 9.1°C 11°C - 100% 0.12kPa
08:00
9.9°C 9.2°C 13°C - 100% 0.24kPa
09:00
10°C 9.5°C 15°C - 41% 0.45kPa
10:00
10°C 10°C 17°C - 74% 0.72kPa
11:00
10°C 10°C 19°C - 5% 0.88kPa
12:00
11°C 11°C 20°C - 0% 1kPa
13:00
11°C 11°C 20°C - 0% 1.1kPa
14:00
11°C 12°C 20°C - 0% 1.1kPa
15:00
11°C 12°C 17°C - 28% 0.62kPa
16:00
10°C 12°C 13°C - 56% 0.27kPa
17:00
9.3°C 12°C 9.7°C - 84% 0.04kPa
18:00
9.4°C 12°C 9.8°C - 72% 0.03kPa
19:00
9.5°C 12°C 9.8°C - 61% 0.02kPa
20:00
9.6°C 11°C 9.8°C - 49% 0.01kPa
21:00
9.8°C 11°C 10°C - 37% 0.02kPa
22:00
9.9°C 11°C 10°C - 24% 0.03kPa
23:00
10°C 11°C 10°C - 12% 0.03kPa
Wed, May 27 Sunrise 04:54 Sunset 20:05
24:00
11°C 11°C 13°C - 10% 0.17kPa
01:00
12°C 11°C 15°C - 7% 0.35kPa
02:00
13°C 11°C 18°C - 4% 0.58kPa
03:00
12°C 12°C 19°C - 3% 0.8kPa
04:00
11°C 12°C 20°C - 2% 1.1kPa
05:00
9.3°C 12°C 21°C - 0% 1.3kPa
06:00
9°C 13°C 22°C - 31% 1.4kPa
07:00
8.6°C 13°C 22°C - 62% 1.5kPa
08:00
8.2°C 14°C 23°C - 92% 1.6kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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