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Rule Dawn Crystals

San Gimignano - Dawn Crystals - Tuscany

San Gimignano, Tuscany, Italy

Morning dew drops or frost crystals on calm mornings

Currently

Real-time conditions
Frost Probability
1%
Soil Temperature7.5°C
Dew Point5.9°C (moderate dew point)
Wind Speed1.7m/s (calm conditions)
Cloud Cover100%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Rome
Next opportunity
Dawn Crystals
San Gimignano
Tomorrow · 07:00–08:00 · 1h window
Medium confidence
47%
❄️Frost Probability0%
thermometer-snow weather icon
Dawn Crystals
San Gimignano
Tue, Feb 10 · 06:36–07:00
❄️Frost Probability:2%
Medium
thermometer-snow weather icon
Dawn Crystals
San Gimignano
Tue, Feb 10 · 07:00–08:51
❄️Frost Probability:1.8-2.1%
Low

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72-hour requirements breakdown

What passed or failed, hour by hour
4matching hours in the next 72 hoursJump to next match
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time
Europe/Rome
Time Window
Sunrise -45m to +90m
Frost Probability
OR1·B1
≥ 60.0%
Dewpoint Spread
OR1·B2
≤ 3.0°C
Relative Humidity
OR1·B2
≥ 85.0%
Wind Speed
≤ 1.5m/s
Sun, Feb 8
07:00✓1.2%0.8°C94%2.3m/s
08:00✓1.2%0.8°C95%1.7m/s
09:00✕1.8%1.3°C91%1.4m/s
10:00✕2.1%2.4°C85%1.4m/s
11:00✕0%3.3°C80%1.2m/s
12:00✕0%4.3°C75%1m/s
13:00✕0%5.2°C70%0.82m/s
14:00✕0%5.9°C67%1.2m/s
15:00✕0%5.7°C68%2m/s
16:00✕0%3.8°C77%1.8m/s
17:00✕0%3.5°C79%1.9m/s
18:00✕0%3°C81%1.7m/s
19:00✕0%2.1°C87%2m/s
20:00✕0%1.8°C89%1.8m/s
21:00✕0%1.8°C88%1.1m/s
22:00✕0%1.8°C89%0.19m/s
23:00✕0%1.6°C90%1m/s
Mon, Feb 9
24:00✕0%1.6°C90%1.6m/s
01:00✕0%1.9°C88%1.9m/s
02:00✕0%2.1°C87%2.2m/s
03:00✕0%2°C87%2.2m/s
04:00✕0%2.1°C87%2.2m/s
05:00✕0%2.1°C87%2.2m/s
06:00✓0%2.1°C87%1.8m/s
07:00✓0%2.4°C85%1.3m/s
08:00✓0%2.5°C84%0.93m/s
09:00✕0%2.6°C84%1.1m/s
10:00✕0%2.8°C82%1.1m/s
11:00✕0%3.5°C79%1.4m/s
12:00✕0%4°C76%1.7m/s
13:00✕0%4.9°C72%2.3m/s
14:00✕0%5.1°C71%2.8m/s
15:00✕0%4.7°C73%2.9m/s
16:00✕0%4.3°C75%1.8m/s
17:00✕0%3.2°C81%1.3m/s
18:00✕0%3°C82%1.3m/s
19:00✕0%2.8°C83%1.7m/s
20:00✕0%2.3°C86%1.9m/s
21:00✕0%2.1°C87%1.7m/s
22:00✕0%2.1°C87%1.3m/s
23:00✕0%2°C87%0.91m/s
Tue, Feb 10
24:00✕0%2°C87%0.88m/s
01:00✕0%1.9°C88%1m/s
02:00✕0%1.8°C88%0.67m/s
03:00✕0%1.7°C89%0.57m/s
04:00✕0%1.4°C91%0.91m/s
05:00✕2.4%1.2°C92%0.44m/s
06:00✓2%1.2°C92%0.58m/s
07:00✓1.8%1.2°C92%1.1m/s
08:00✓2.1%1.7°C89%1.1m/s
09:00✕2.4%2.3°C86%0.35m/s
10:00✕4.3%3.5°C79%0.26m/s
11:00✕0%4.6°C73%0.39m/s
12:00✕0%5.2°C70%1.3m/s
13:00✕0%5.2°C70%2.4m/s
14:00✕0%4.1°C76%2.1m/s
15:00✕0%3°C81%1.9m/s
16:00✕0%2°C87%1.6m/s
17:00✕0%2°C87%1.7m/s
18:00✕0%2.1°C87%1.8m/s
19:00✕0%2°C87%1.9m/s
20:00✕0%2.1°C86%2.1m/s
21:00✕0%2.3°C86%2.3m/s
22:00✕1.9%2.4°C85%2.6m/s
23:00✕1.9%2.1°C87%2.4m/s
Wed, Feb 11
24:00✕1.9%1.8°C88%2.3m/s
01:00✕1.6%1.6°C90%2.2m/s
02:00✕1.6%1.5°C90%2.1m/s
03:00✕1.6%1.4°C91%2.1m/s
04:00✕1.6%1.4°C92%2m/s
05:00✕1.9%1.4°C91%2.2m/s
06:00✓1.9%1.6°C90%2.3m/s
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity). For OR groups, only one branch is required, so some OR-branch predicates can be ✕ even in a matching hour.

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
Europe/Rome
Frost Probability
%
Dew Point
°C
Dewpoint Spread
°C
Relative Humidity
%
Surface Temperature
°C
Temperature
°C
Time Window
Total Cloud Coverage
%
Vapor Pressure Deficit
kPa
Sun, Feb 8 Sunrise 07:24 Sunset 17:36
08:00
1.2% 5.9°C 0.8°C 95% 7.5°C 6.7°C - 100% 0.05kPa
09:00
1.8% 6.8°C 1.3°C 91% 7.6°C 8.1°C - 100% 0.1kPa
10:00
2.1% 7.2°C 2.4°C 85% 7.8°C 9.6°C - 100% 0.18kPa
11:00
0% 7.2°C 3.3°C 80% 8.2°C 11°C - 100% 0.25kPa
12:00
0% 6.9°C 4.3°C 75% 8.6°C 11°C - 100% 0.33kPa
13:00
0% 6.8°C 5.2°C 70% 9.2°C 12°C - 100% 0.42kPa
14:00
0% 6.4°C 5.9°C 67% 9.6°C 12°C - 100% 0.47kPa
15:00
0% 6.6°C 5.7°C 68% 9.9°C 12°C - 100% 0.46kPa
16:00
0% 7.7°C 3.8°C 77% 10°C 12°C - 100% 0.31kPa
17:00
0% 7°C 3.5°C 79% 10°C 10°C - 100% 0.27kPa
18:00 ☾
0% 6.8°C 3°C 81% 9.9°C 9.8°C - 100% 0.23kPa
19:00 ☾
0% 7.3°C 2.1°C 87% 9.8°C 9.4°C - 100% 0.16kPa
20:00 ☾
0% 7.3°C 1.8°C 88% 9.7°C 9.1°C - 100% 0.13kPa
21:00 ☾
0% 6.9°C 1.8°C 88% 9.6°C 8.7°C - 100% 0.14kPa
22:00 ☾
0% 6.5°C 1.8°C 89% 9.4°C 8.3°C - 100% 0.12kPa
23:00 ☾
0% 6.4°C 1.6°C 90% 9.3°C 8°C - 100% 0.11kPa
Mon, Feb 9 Sunrise 07:24 Sunset 17:36
24:00 ☾
0% 6.3°C 1.6°C 90% 9.2°C 7.9°C - 100% 0.11kPa
01:00 ☾
0% 6.1°C 1.9°C 88% 9.1°C 8°C - 100% 0.13kPa
02:00 ☾
0% 6°C 2.1°C 87% 8.9°C 8.1°C - 100% 0.14kPa
03:00 ☾
0% 6°C 2°C 87% 8.8°C 8°C - 100% 0.14kPa
04:00 ☾
0% 5.9°C 2.1°C 87% 8.7°C 8°C - 100% 0.14kPa
05:00 ☾
0% 5.9°C 2.1°C 87% 8.7°C 8°C - 100% 0.14kPa
06:00 ☾
0% 5.8°C 2.1°C 86% 8.6°C 7.9°C - 100% 0.14kPa
07:00 ☾
0% 5.6°C 2.4°C 85% 8.5°C 8°C - 100% 0.16kPa
08:00
0% 5.6°C 2.5°C 84% 8.4°C 8.1°C - 100% 0.17kPa
09:00
0% 5.7°C 2.6°C 84% 8.4°C 8.3°C - 100% 0.18kPa
10:00
0% 5.8°C 2.8°C 82% 8.4°C 8.6°C - 100% 0.2kPa
11:00
0% 5.5°C 3.5°C 79% 8.5°C 9°C - 100% 0.24kPa
12:00
0% 5.4°C 4°C 76% 8.6°C 9.4°C - 100% 0.29kPa
13:00
0% 5.6°C 4.9°C 72% 8.9°C 10°C - 100% 0.36kPa
14:00
0% 5.8°C 5.1°C 71% 9.1°C 11°C - 100% 0.38kPa
15:00
0% 6°C 4.7°C 73% 9.3°C 11°C - 100% 0.35kPa
16:00
0% 6.1°C 4.3°C 75% 9.5°C 10°C - 100% 0.32kPa
17:00
0% 6.6°C 3.2°C 81% 9.6°C 9.8°C - 100% 0.23kPa
18:00 ☾
0% 6.1°C 3°C 82% 9.5°C 9.1°C - 94% 0.21kPa
19:00 ☾
0% 6.1°C 2.8°C 83% 9.3°C 8.9°C - 78% 0.19kPa
20:00 ☾
0% 6.1°C 2.3°C 86% 9.2°C 8.4°C - 94% 0.16kPa
21:00 ☾
0% 6.2°C 2.1°C 87% 9.1°C 8.3°C - 96% 0.15kPa
22:00 ☾
0% 6.2°C 2.1°C 87% 9°C 8.3°C - 97% 0.14kPa
23:00 ☾
0% 6.2°C 2°C 87% 8.9°C 8.2°C - 98% 0.14kPa
Tue, Feb 10 Sunrise 07:22 Sunset 17:37
24:00 ☾
0% 6.2°C 2°C 87% 8.8°C 8.2°C - 100% 0.14kPa
01:00 ☾
0% 6.2°C 1.9°C 88% 8.7°C 8.1°C - 100% 0.13kPa
02:00 ☾
0% 6.2°C 1.8°C 88% 8.6°C 8°C - 97% 0.13kPa
03:00 ☾
0% 6.2°C 1.7°C 89% 8.5°C 7.9°C - 80% 0.12kPa
04:00 ☾
0% 5.6°C 1.4°C 91% 8.3°C 7°C - 50% 0.09kPa
05:00 ☾
2.4% 5.1°C 1.2°C 92% 8°C 6.3°C - 48% 0.08kPa
06:00 ☾
2% 4.9°C 1.2°C 92% 7.7°C 6.1°C - 81% 0.08kPa
07:00 ☾
1.8% 5.1°C 1.2°C 92% 7.6°C 6.3°C - 94% 0.08kPa
08:00
2.1% 5.6°C 1.7°C 89% 7.5°C 7.3°C - 98% 0.11kPa
09:00
2.4% 6°C 2.3°C 86% 7.5°C 8.3°C - 63% 0.16kPa
10:00
4.3% 6.2°C 3.5°C 79% 7.8°C 9.7°C - 38% 0.25kPa
11:00
0% 6.4°C 4.6°C 73% 8.4°C 11°C - 84% 0.35kPa
12:00
0% 6.3°C 5.2°C 70% 9°C 12°C - 100% 0.4kPa
13:00
0% 6°C 5.2°C 70% 9.3°C 11°C - 100% 0.39kPa
14:00
0% 6°C 4.1°C 76% 9.1°C 10°C - 96% 0.3kPa
15:00
0% 5.9°C 3°C 81% 8.9°C 8.9°C - 92% 0.21kPa
16:00
0% 5.7°C 2°C 87% 8.7°C 7.7°C - 88% 0.14kPa
17:00
0% 5.3°C 2°C 87% 8.6°C 7.3°C - 84% 0.13kPa
18:00 ☾
0% 4.8°C 2.1°C 87% 8.4°C 6.9°C - 79% 0.13kPa
19:00 ☾
0% 4.4°C 2°C 87% 8.3°C 6.4°C - 75% 0.13kPa
20:00 ☾
0% 4.5°C 2.1°C 86% 8.1°C 6.6°C - 83% 0.13kPa
21:00 ☾
0% 4.5°C 2.3°C 86% 8°C 6.8°C - 92% 0.14kPa
22:00 ☾
1.9% 4.6°C 2.4°C 85% 7.9°C 7°C - 100% 0.15kPa
23:00 ☾
1.9% 4.9°C 2.1°C 87% 7.9°C 7°C - 100% 0.13kPa
Wed, Feb 11 Sunrise 07:21 Sunset 17:39
24:00 ☾
1.9% 5.2°C 1.8°C 88% 7.8°C 7°C - 100% 0.12kPa
01:00 ☾
1.6% 5.5°C 1.6°C 90% 7.8°C 7.1°C - 100% 0.1kPa
02:00 ☾
1.6% 6.1°C 1.5°C 90% 7.7°C 7.6°C - 100% 0.1kPa
03:00 ☾
1.6% 6.8°C 1.4°C 91% 7.7°C 8.2°C - 100% 0.1kPa
04:00 ☾
1.6% 7.4°C 1.4°C 92% 7.7°C 8.8°C - 100% 0.1kPa
05:00 ☾
1.9% 7.9°C 1.4°C 91% 7.8°C 9.3°C - 100% 0.11kPa
06:00 ☾
1.9% 8.3°C 1.6°C 90% 8°C 9.9°C - 100% 0.13kPa
07:00 ☾
0% 8.7°C 1.7°C 89% 8.2°C 10°C - 100% 0.14kPa
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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