Rule
Dawn Crystals
Volterra - Dawn Crystals - Tuscany
Volterra, Tuscany, Italy
Morning dew drops or frost crystals on calm mornings
Currently
Real-time conditionsSoil Temperature7.4°C
Dew Point6.2°C (moderate dew point)
Wind Speed1.2m/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
Volterra
Today · 08:00–08:54 · 1h window
Medium confidence
68%
❄️Frost Probability1.4%
Dawn Crystals
Volterra
Tomorrow · 07:00–08:53
❄️Frost Probability:0%
Low
Dawn Crystals
Volterra
Tue, Feb 10 · 06:37–07:00
❄️Frost Probability:1.8%
Medium
Dawn Crystals
Volterra
Tue, Feb 10 · 07:00–08:52
❄️Frost Probability:2.1-2.5%
Low
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72-hour requirements breakdown
What passed or failed, hour by hourOR 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°C | 95% | 1.8m/s |
| 08:00 | ✓ | 1.4% | 0.9°C | 94% | 1.2m/s |
| 09:00 | ✕ | 2.1% | 1.5°C | 90% | 1.3m/s |
| 10:00 | ✕ | 2.1% | 2.4°C | 85% | 1.2m/s |
| 11:00 | ✕ | 0% | 3.3°C | 80% | 1m/s |
| 12:00 | ✕ | 0% | 4.2°C | 75% | 0.85m/s |
| 13:00 | ✕ | 0% | 5.1°C | 71% | 0.77m/s |
| 14:00 | ✕ | 0% | 5.4°C | 70% | 1.7m/s |
| 15:00 | ✕ | 0% | 5°C | 72% | 2.7m/s |
| 16:00 | ✕ | 0% | 3.1°C | 81% | 2.6m/s |
| 17:00 | ✕ | 0% | 2.6°C | 84% | 2.1m/s |
| 18:00 | ✕ | 0% | 2.4°C | 85% | 1.5m/s |
| 19:00 | ✕ | 0% | 1.9°C | 88% | 1.4m/s |
| 20:00 | ✕ | 0% | 1.3°C | 91% | 1.1m/s |
| 21:00 | ✕ | 0% | 1.3°C | 92% | 0.46m/s |
| 22:00 | ✕ | 0% | 1.5°C | 91% | 0.92m/s |
| 23:00 | ✕ | 0% | 1.6°C | 90% | 1.7m/s |
| Mon, Feb 9 | |||||
| 24:00 | ✕ | 0% | 1.4°C | 91% | 1.9m/s |
| 01:00 | ✕ | 0% | 1.5°C | 90% | 2.1m/s |
| 02:00 | ✕ | 0% | 1.8°C | 88% | 2.2m/s |
| 03:00 | ✕ | 0% | 1.8°C | 89% | 2m/s |
| 04:00 | ✕ | 0% | 1.8°C | 88% | 2m/s |
| 05:00 | ✕ | 0% | 2°C | 87% | 2.3m/s |
| 06:00 | ✓ | 0% | 2.1°C | 87% | 2m/s |
| 07:00 | ✓ | 0% | 2.1°C | 87% | 1.5m/s |
| 08:00 | ✓ | 0% | 2.2°C | 86% | 1.3m/s |
| 09:00 | ✕ | 0% | 2.8°C | 83% | 1.3m/s |
| 10:00 | ✕ | 0% | 3.6°C | 78% | 2.1m/s |
| 11:00 | ✕ | 0% | 3.9°C | 77% | 2.8m/s |
| 12:00 | ✕ | 0% | 4.3°C | 75% | 2.7m/s |
| 13:00 | ✕ | 0% | 4.5°C | 74% | 2.7m/s |
| 14:00 | ✕ | 0% | 5.2°C | 70% | 2.8m/s |
| 15:00 | ✕ | 0% | 5.2°C | 70% | 3.2m/s |
| 16:00 | ✕ | 0% | 4.7°C | 73% | 2.5m/s |
| 17:00 | ✕ | 0% | 3.2°C | 80% | 1.3m/s |
| 18:00 | ✕ | 0% | 3.2°C | 81% | 1.3m/s |
| 19:00 | ✕ | 0% | 2.6°C | 84% | 1.8m/s |
| 20:00 | ✕ | 0% | 1.9°C | 88% | 1.9m/s |
| 21:00 | ✕ | 0% | 1.7°C | 89% | 1.6m/s |
| 22:00 | ✕ | 0% | 1.8°C | 89% | 1.1m/s |
| 23:00 | ✕ | 0% | 1.8°C | 88% | 0.69m/s |
| Tue, Feb 10 | |||||
| 24:00 | ✕ | 0% | 1.9°C | 88% | 0.43m/s |
| 01:00 | ✕ | 0% | 2.1°C | 86% | 0.64m/s |
| 02:00 | ✕ | 2.1% | 2.1°C | 87% | 0.82m/s |
| 03:00 | ✕ | 2.1% | 1.8°C | 88% | 0.8m/s |
| 04:00 | ✕ | 2.5% | 1.7°C | 89% | 0.87m/s |
| 05:00 | ✕ | 1.9% | 1.5°C | 90% | 0.82m/s |
| 06:00 | ✓ | 1.8% | 1.6°C | 90% | 0.87m/s |
| 07:00 | ✓ | 2.1% | 1.8°C | 88% | 0.92m/s |
| 08:00 | ✓ | 2.5% | 2.1°C | 87% | 1.1m/s |
| 09:00 | ✕ | 2.7% | 2.8°C | 83% | 0.52m/s |
| 10:00 | ✕ | 4% | 4°C | 76% | 0.61m/s |
| 11:00 | ✕ | 0% | 4.9°C | 72% | 0.52m/s |
| 12:00 | ✕ | 0% | 5.6°C | 68% | 1.8m/s |
| 13:00 | ✕ | 0% | 6°C | 67% | 2.8m/s |
| 14:00 | ✕ | 0% | 4.6°C | 73% | 2.4m/s |
| 15:00 | ✕ | 0% | 3.2°C | 80% | 2m/s |
| 16:00 | ✕ | 0% | 2°C | 87% | 1.6m/s |
| 17:00 | ✕ | 0% | 2°C | 87% | 1.7m/s |
| 18:00 | ✕ | 0% | 2.1°C | 87% | 1.8m/s |
| 19:00 | ✕ | 0% | 2°C | 87% | 1.9m/s |
| 20:00 | ✕ | 0% | 2.1°C | 86% | 2.1m/s |
| 21:00 | ✕ | 0% | 2.3°C | 86% | 2.3m/s |
| 22:00 | ✕ | 1.9% | 2.4°C | 85% | 2.6m/s |
| 23:00 | ✕ | 1.9% | 2.1°C | 87% | 2.4m/s |
| Wed, Feb 11 | |||||
| 24:00 | ✕ | 1.9% | 1.8°C | 88% | 2.3m/s |
| 01:00 | ✕ | 1.6% | 1.6°C | 90% | 2.2m/s |
| 02:00 | ✕ | 1.6% | 1.5°C | 90% | 2.1m/s |
| 03:00 | ✕ | 1.6% | 1.4°C | 91% | 2.1m/s |
| 04:00 | ✕ | 1.6% | 1.4°C | 92% | 2m/s |
| 05:00 | ✕ | 1.9% | 1.4°C | 91% | 2.2m/s |
| 06:00 | ✓ | 1.9% | 1.6°C | 90% | 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 scoreThis 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 17:37 | |||||||||
| 08:00 | 1.4% | 6.2°C | 0.9°C | 94% | 7.4°C | 7.1°C | - | 100% | 0.06kPa |
| 09:00 | 2.1% | 7.1°C | 1.5°C | 90% | 7.5°C | 8.6°C | - | 100% | 0.11kPa |
| 10:00 | 2.1% | 7.5°C | 2.4°C | 85% | 7.8°C | 9.9°C | - | 100% | 0.18kPa |
| 11:00 | 0% | 7.4°C | 3.3°C | 80% | 8.1°C | 11°C | - | 100% | 0.25kPa |
| 12:00 | 0% | 7.2°C | 4.2°C | 75% | 8.5°C | 11°C | - | 100% | 0.34kPa |
| 13:00 | 0% | 7.1°C | 5.1°C | 71% | 9°C | 12°C | - | 100% | 0.41kPa |
| 14:00 | 0% | 7°C | 5.4°C | 70% | 9.5°C | 12°C | - | 100% | 0.44kPa |
| 15:00 | 0% | 7.3°C | 5°C | 72% | 9.7°C | 12°C | - | 100% | 0.4kPa |
| 16:00 | 0% | 8.2°C | 3.1°C | 81% | 9.8°C | 11°C | - | 100% | 0.26kPa |
| 17:00 | 0% | 7.7°C | 2.6°C | 84% | 9.8°C | 10°C | - | 100% | 0.2kPa |
| 18:00 ☾ | 0% | 7.3°C | 2.4°C | 85% | 9.8°C | 9.7°C | - | 100% | 0.18kPa |
| 19:00 ☾ | 0% | 7.6°C | 1.9°C | 88% | 9.7°C | 9.5°C | - | 100% | 0.14kPa |
| 20:00 ☾ | 0% | 7.8°C | 1.3°C | 91% | 9.6°C | 9.1°C | - | 100% | 0.1kPa |
| 21:00 ☾ | 0% | 7.3°C | 1.3°C | 92% | 9.5°C | 8.6°C | - | 100% | 0.09kPa |
| 22:00 ☾ | 0% | 6.8°C | 1.5°C | 91% | 9.4°C | 8.3°C | - | 100% | 0.1kPa |
| 23:00 ☾ | 0% | 6.5°C | 1.6°C | 90% | 9.2°C | 8.1°C | - | 100% | 0.11kPa |
| Mon, Feb 9
Sunrise 07:24
Sunset 17:37 | |||||||||
| 24:00 ☾ | 0% | 6.5°C | 1.4°C | 91% | 9.1°C | 7.9°C | - | 100% | 0.1kPa |
| 01:00 ☾ | 0% | 6.4°C | 1.5°C | 90% | 9°C | 7.9°C | - | 100% | 0.1kPa |
| 02:00 ☾ | 0% | 6.3°C | 1.8°C | 88% | 8.9°C | 8.1°C | - | 100% | 0.13kPa |
| 03:00 ☾ | 0% | 6.4°C | 1.8°C | 89% | 8.8°C | 8.2°C | - | 100% | 0.12kPa |
| 04:00 ☾ | 0% | 6.4°C | 1.8°C | 88% | 8.7°C | 8.2°C | - | 100% | 0.13kPa |
| 05:00 ☾ | 0% | 6.2°C | 2°C | 87% | 8.6°C | 8.2°C | - | 100% | 0.14kPa |
| 06:00 ☾ | 0% | 6.1°C | 2.1°C | 87% | 8.5°C | 8.2°C | - | 100% | 0.14kPa |
| 07:00 ☾ | 0% | 5.6°C | 2.1°C | 87% | 8.4°C | 7.7°C | - | 100% | 0.14kPa |
| 08:00 | 0% | 5.7°C | 2.2°C | 86% | 8.3°C | 7.9°C | - | 100% | 0.15kPa |
| 09:00 | 0% | 6°C | 2.8°C | 82% | 8.4°C | 8.8°C | - | 100% | 0.2kPa |
| 10:00 | 0% | 5.9°C | 3.6°C | 78% | 8.5°C | 9.5°C | - | 99% | 0.26kPa |
| 11:00 | 0% | 5.9°C | 3.9°C | 77% | 8.6°C | 9.8°C | - | 100% | 0.28kPa |
| 12:00 | 0% | 5.8°C | 4.3°C | 75% | 8.8°C | 10°C | - | 100% | 0.31kPa |
| 13:00 | 0% | 5.9°C | 4.5°C | 74% | 9°C | 10°C | - | 100% | 0.33kPa |
| 14:00 | 0% | 6°C | 5.2°C | 70% | 9.3°C | 11°C | - | 100% | 0.4kPa |
| 15:00 | 0% | 6.2°C | 5.2°C | 70% | 9.5°C | 11°C | - | 90% | 0.4kPa |
| 16:00 | 0% | 6.3°C | 4.7°C | 73% | 9.7°C | 11°C | - | 100% | 0.35kPa |
| 17:00 | 0% | 6.8°C | 3.2°C | 80% | 9.7°C | 10°C | - | 100% | 0.24kPa |
| 18:00 ☾ | 0% | 6.2°C | 3.2°C | 81% | 9.6°C | 9.4°C | - | 97% | 0.23kPa |
| 19:00 ☾ | 0% | 5.9°C | 2.6°C | 84% | 9.4°C | 8.5°C | - | 57% | 0.18kPa |
| 20:00 ☾ | 0% | 5.7°C | 1.9°C | 88% | 9.1°C | 7.6°C | - | 30% | 0.12kPa |
| 21:00 ☾ | 0% | 5.5°C | 1.7°C | 89% | 8.9°C | 7.2°C | - | 20% | 0.11kPa |
| 22:00 ☾ | 0% | 5.3°C | 1.8°C | 89% | 8.6°C | 7.1°C | - | 30% | 0.11kPa |
| 23:00 ☾ | 0% | 5.2°C | 1.8°C | 88% | 8.3°C | 7°C | - | 58% | 0.12kPa |
| Tue, Feb 10
Sunrise 07:23
Sunset 17:38 | |||||||||
| 24:00 ☾ | 0% | 5.4°C | 1.9°C | 88% | 8.1°C | 7.3°C | - | 92% | 0.12kPa |
| 01:00 ☾ | 0% | 5.9°C | 2.1°C | 86% | 8°C | 8°C | - | 97% | 0.15kPa |
| 02:00 ☾ | 2.1% | 6°C | 2.1°C | 87% | 8°C | 8.1°C | - | 84% | 0.14kPa |
| 03:00 ☾ | 2.1% | 5.8°C | 1.8°C | 88% | 7.8°C | 7.6°C | - | 94% | 0.12kPa |
| 04:00 ☾ | 2.5% | 5.4°C | 1.7°C | 89% | 7.6°C | 7.1°C | - | 52% | 0.11kPa |
| 05:00 ☾ | 1.9% | 5°C | 1.5°C | 90% | 7.4°C | 6.5°C | - | 76% | 0.1kPa |
| 06:00 ☾ | 1.8% | 4.8°C | 1.6°C | 90% | 7.2°C | 6.4°C | - | 91% | 0.1kPa |
| 07:00 ☾ | 2.1% | 5.3°C | 1.8°C | 88% | 7.2°C | 7.1°C | - | 100% | 0.12kPa |
| 08:00 | 2.5% | 5.6°C | 2.1°C | 87% | 7.2°C | 7.7°C | - | 54% | 0.14kPa |
| 09:00 | 2.7% | 6°C | 2.8°C | 83% | 7.2°C | 8.8°C | - | 40% | 0.2kPa |
| 10:00 | 4% | 6.3°C | 4°C | 76% | 7.6°C | 10°C | - | 48% | 0.3kPa |
| 11:00 | 0% | 6.6°C | 4.9°C | 72% | 8.2°C | 12°C | - | 88% | 0.39kPa |
| 12:00 | 0% | 6.3°C | 5.6°C | 68% | 8.7°C | 12°C | - | 97% | 0.44kPa |
| 13:00 | 0% | 5.9°C | 6°C | 67% | 9.1°C | 12°C | - | 96% | 0.46kPa |
| 14:00 | 0% | 5.9°C | 4.6°C | 73% | 8.9°C | 10°C | - | 94% | 0.34kPa |
| 15:00 | 0% | 5.9°C | 3.2°C | 80% | 8.8°C | 9.1°C | - | 91% | 0.23kPa |
| 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 07:22
Sunset 17:40 | |||||||||
| 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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