Rule
Dawn Crystals
Cappella della Madonna di Vitaleta - Dawn Crystals - Tuscany
San Quirico d'Orcia, Tuscany, Italy
Morning dew drops or frost crystals on calm mornings
No opportunities right now
Here’s what usually blocks matches
No Dawn Crystals opportunities in the next 14 days
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Rule requirements (key thresholds)
Time Window · Sunrise -45m to +90m Frost Probability · ≥ 60.0% Dewpoint Spread · ≤ 3.0°C Relative Humidity · ≥ 85.0%
Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.
Most common blockers (next 72 hours)
Time Window 88% failing
Frost Probability 76% failing
Wind Speed 67% failing
Currently
Real-time conditionsSoil Temperature8.1°C
Dew Point-1.9°C (low dew point)
Wind Speed2.8m/s (calm conditions)
Cloud Cover0%
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in Europe/Rome
No opportunities in the next 10 days
See the blocker timeline below to understand which conditions are preventing matches.
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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 |
|---|---|---|---|---|---|
| Mon, Feb 16 | |||||
| 14:00 | ✕ | 0% | 3.2°C | 81% | 6.9m/s |
| 15:00 | ✕ | 0% | 2.8°C | 83% | 8.7m/s |
| 16:00 | ✕ | 0% | 2.6°C | 83% | 9.8m/s |
| 17:00 | ✕ | 0% | 2.5°C | 85% | 8.7m/s |
| 18:00 | ✕ | 0% | 2.3°C | 85% | 5.8m/s |
| 19:00 | ✕ | 0% | 2.1°C | 87% | 3.7m/s |
| 20:00 | ✕ | 0% | 2.5°C | 85% | 5.2m/s |
| 21:00 | ✕ | 0% | 1.6°C | 90% | 2.3m/s |
| 22:00 | ✕ | 0% | 1.1°C | 93% | 2.3m/s |
| 23:00 | ✕ | 0% | 1.1°C | 93% | 1.7m/s |
| Tue, Feb 17 | |||||
| 24:00 | ✕ | 2.9% | 1°C | 93% | 1.7m/s |
| 01:00 | ✕ | 2.9% | 0.9°C | 94% | 1m/s |
| 02:00 | ✕ | 2% | 1.1°C | 93% | 0.76m/s |
| 03:00 | ✕ | 2.1% | 0.9°C | 94% | 0.98m/s |
| 04:00 | ✕ | 2.3% | 0.6°C | 96% | 1.7m/s |
| 05:00 | ✕ | 2.7% | 0.4°C | 97% | 0.29m/s |
| 06:00 | ✓ | 3.1% | 0.8°C | 95% | 0.55m/s |
| 07:00 | ✓ | 3.5% | 1.2°C | 92% | 0.44m/s |
| 08:00 | ✓ | 37% | 2.4°C | 84% | 0.94m/s |
| 09:00 | ✕ | 48% | 4.7°C | 72% | 1.9m/s |
| 10:00 | ✕ | 5% | 6.5°C | 63% | 2.2m/s |
| 11:00 | ✕ | 4.7% | 9.4°C | 52% | 3.4m/s |
| 12:00 | ✕ | 4.2% | 12°C | 44% | 4.1m/s |
| 13:00 | ✕ | 4% | 13°C | 41% | 2.9m/s |
| 14:00 | ✕ | 0% | 15°C | 36% | 2.8m/s |
| 15:00 | ✕ | 0% | 15°C | 36% | 3.2m/s |
| 16:00 | ✕ | 0% | 12°C | 45% | 3m/s |
| 17:00 | ✕ | 0% | 6.7°C | 63% | 2.4m/s |
| 18:00 | ✕ | 0% | 4.9°C | 71% | 0.87m/s |
| 19:00 | ✕ | 0% | 4.7°C | 72% | 0.54m/s |
| 20:00 | ✕ | 4.9% | 4.7°C | 72% | 1.1m/s |
| 21:00 | ✕ | 4.9% | 4.4°C | 74% | 0.94m/s |
| 22:00 | ✕ | 5% | 4°C | 75% | 0.71m/s |
| 23:00 | ✕ | 5% | 4.2°C | 75% | 0.67m/s |
| Wed, Feb 18 | |||||
| 24:00 | ✕ | 5% | 4.6°C | 72% | 0.76m/s |
| 01:00 | ✕ | 4.9% | 5°C | 70% | 0.91m/s |
| 02:00 | ✕ | 46% | 4.9°C | 70% | 1.1m/s |
| 03:00 | ✕ | 36% | 4.5°C | 73% | 1.1m/s |
| 04:00 | ✕ | 34% | 3.9°C | 76% | 1.3m/s |
| 05:00 | ✕ | 30% | 3.3°C | 79% | 1.1m/s |
| 06:00 | ✓ | 30% | 3.2°C | 80% | 1m/s |
| 07:00 | ✓ | 30% | 3.1°C | 80% | 1.5m/s |
| 08:00 | ✓ | 30% | 3.5°C | 78% | 1.5m/s |
| 09:00 | ✕ | 35% | 4.6°C | 72% | 1m/s |
| 10:00 | ✕ | 36% | 5.9°C | 66% | 1.2m/s |
| 11:00 | ✕ | 37% | 7.8°C | 58% | 1.3m/s |
| 12:00 | ✕ | 3.5% | 9.9°C | 51% | 0.21m/s |
| 13:00 | ✕ | 4.2% | 12°C | 45% | 1.1m/s |
| 14:00 | ✕ | 4.2% | 12°C | 44% | 2.2m/s |
| 15:00 | ✕ | 0% | 11°C | 46% | 2.8m/s |
| 16:00 | ✕ | 0% | 8.9°C | 54% | 2.7m/s |
| 17:00 | ✕ | 0% | 5.5°C | 69% | 1.8m/s |
| 18:00 | ✕ | 0% | 3.4°C | 79% | 1.4m/s |
| 19:00 | ✕ | 0% | 2.7°C | 83% | 1.8m/s |
| 20:00 | ✕ | 0% | 2.7°C | 83% | 2.4m/s |
| 21:00 | ✕ | 1.9% | 2.6°C | 83% | 1.9m/s |
| 22:00 | ✕ | 1.9% | 2.5°C | 85% | 1.9m/s |
| 23:00 | ✕ | 1.9% | 2.2°C | 86% | 2m/s |
| Thu, Feb 19 | |||||
| 24:00 | ✕ | 1.9% | 2.1°C | 87% | 1.7m/s |
| 01:00 | ✕ | 1.7% | 1.5°C | 90% | 1.9m/s |
| 02:00 | ✕ | 1.6% | 1.3°C | 92% | 2.2m/s |
| 03:00 | ✕ | 1.6% | 1.3°C | 91% | 2.2m/s |
| 04:00 | ✕ | 1.7% | 1.8°C | 89% | 2.8m/s |
| 05:00 | ✕ | 1.7% | 2.2°C | 86% | 2.9m/s |
| 06:00 | ✓ | 1.7% | 2.4°C | 85% | 3.7m/s |
| 07:00 | ✓ | 1.6% | 2.2°C | 86% | 4.4m/s |
| 08:00 | ✓ | 2.6% | 3.3°C | 80% | 5.7m/s |
| 09:00 | ✕ | 2.6% | 3.7°C | 78% | 8.1m/s |
| 10:00 | ✕ | 2.2% | 2.8°C | 83% | 9.4m/s |
| 11:00 | ✕ | 0% | 2.8°C | 83% | 9.4m/s |
| 12:00 | ✕ | 0% | 3.5°C | 79% | 9.7m/s |
| 13:00 | ✕ | 0% | 3.6°C | 78% | 7.9m/s |
| 14:00 | ✕ | 0% | 4.5°C | 74% | 7.8m/s |
| 15:00 | ✕ | 0% | 4.2°C | 75% | 7m/s |
| 16:00 | ✕ | 0% | 2.9°C | 82% | 6.6m/s |
| 17:00 | ✕ | 0% | 2.4°C | 84% | 5.5m/s |
| 18:00 | ✕ | 0% | 2.3°C | 85% | 5.5m/s |
| 19:00 | ✕ | 0% | 2.1°C | 86% | 7m/s |
| 20:00 | ✕ | 0% | 1.7°C | 89% | 5m/s |
| 21:00 | ✕ | 1.8% | 1.1°C | 93% | 2.9m/s |
| 22:00 | ✕ | 2.1% | 0.6°C | 96% | 0.89m/s |
| 23:00 | ✕ | 2.5% | 0.8°C | 95% | 1m/s |
| Fri, Feb 20 | |||||
| 24:00 | ✕ | 2.9% | 1°C | 93% | 1.2m/s |
| 01:00 | ✕ | 2.9% | 1.1°C | 92% | 1.3m/s |
| 02:00 | ✕ | 3% | 1.9°C | 87% | 1.8m/s |
| 03:00 | ✕ | 2.6% | 2.7°C | 83% | 2.2m/s |
| 04:00 | ✕ | 3.6% | 3.6°C | 78% | 2.7m/s |
| 05:00 | ✕ | 3.7% | 4.9°C | 71% | 3.6m/s |
| 06:00 | ✓ | 4.1% | 6.4°C | 65% | 4.5m/s |
| 07:00 | ✓ | 4.5% | 8°C | 58% | 5.4m/s |
| 08:00 | ✓ | 0% | 7.7°C | 60% | 5.3m/s |
| 09:00 | ✕ | 0% | 7.2°C | 61% | 5.1m/s |
| 10:00 | ✕ | 0% | 6.8°C | 63% | 5m/s |
| 11:00 | ✕ | 0% | 5.5°C | 69% | 4.6m/s |
| 12:00 | ✕ | 0% | 4.3°C | 74% | 4.3m/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 |
|---|---|---|---|---|---|---|---|---|---|
| Tue, Feb 17
Sunrise 07:08
Sunset 17:46 | |||||||||
| 14:00 | 0% | -1.9°C | 15°C | 36% | 8.1°C | 13°C | - | 0% | 0.94kPa |
| 15:00 | 0% | -2°C | 15°C | 36% | 8.6°C | 13°C | - | 0% | 0.96kPa |
| 16:00 | 0% | 0.9°C | 12°C | 45% | 8.8°C | 12°C | - | 0% | 0.78kPa |
| 17:00 | 0% | 3.1°C | 6.7°C | 63% | 8.9°C | 9.8°C | - | 0% | 0.45kPa |
| 18:00 ☾ | 0% | 2.2°C | 4.9°C | 71% | 8.6°C | 7.1°C | - | 0% | 0.29kPa |
| 19:00 ☾ | 0% | 1.7°C | 4.7°C | 72% | 8.3°C | 6.4°C | - | 0% | 0.27kPa |
| 20:00 ☾ | 4.9% | 1.3°C | 4.7°C | 72% | 7.9°C | 6°C | - | 0% | 0.26kPa |
| 21:00 ☾ | 4.9% | 1.2°C | 4.4°C | 74% | 7.5°C | 5.6°C | - | 0% | 0.24kPa |
| 22:00 ☾ | 5% | 1.2°C | 4°C | 75% | 7.2°C | 5.2°C | - | 0% | 0.22kPa |
| 23:00 ☾ | 5% | 0.9°C | 4.2°C | 75% | 6.8°C | 5.1°C | - | 0% | 0.22kPa |
| Wed, Feb 18
Sunrise 07:08
Sunset 17:46 | |||||||||
| 24:00 ☾ | 5% | 0.5°C | 4.6°C | 72% | 6.5°C | 5.1°C | - | 5% | 0.24kPa |
| 01:00 ☾ | 4.9% | 0.1°C | 5°C | 70% | 6.2°C | 5.1°C | - | 5% | 0.26kPa |
| 02:00 ☾ | 46% | 0.1°C | 4.9°C | 70% | 5.9°C | 5°C | - | 10% | 0.26kPa |
| 03:00 ☾ | 36% | 0.3°C | 4.5°C | 73% | 5.7°C | 4.8°C | - | 60% | 0.23kPa |
| 04:00 ☾ | 34% | 0.7°C | 3.9°C | 76% | 5.4°C | 4.6°C | - | 53% | 0.2kPa |
| 05:00 ☾ | 30% | 1°C | 3.3°C | 79% | 5.2°C | 4.3°C | - | 100% | 0.18kPa |
| 06:00 ☾ | 30% | 1.1°C | 3.2°C | 80% | 5°C | 4.3°C | - | 100% | 0.17kPa |
| 07:00 ☾ | 30% | 1.2°C | 3.1°C | 80% | 4.9°C | 4.3°C | - | 100% | 0.16kPa |
| 08:00 | 30% | 1.8°C | 3.5°C | 78% | 4.8°C | 5.3°C | - | 100% | 0.2kPa |
| 09:00 | 35% | 2.6°C | 4.6°C | 72% | 5°C | 7.2°C | - | 100% | 0.28kPa |
| 10:00 | 36% | 2.8°C | 5.9°C | 66% | 5.4°C | 8.7°C | - | 67% | 0.38kPa |
| 11:00 | 37% | 2.7°C | 7.8°C | 58% | 6°C | 10°C | - | 89% | 0.53kPa |
| 12:00 | 3.5% | 1.6°C | 9.9°C | 50% | 6.7°C | 12°C | - | 82% | 0.67kPa |
| 13:00 | 4.2% | 0.5°C | 12°C | 45% | 7.4°C | 12°C | - | 23% | 0.79kPa |
| 14:00 | 4.2% | 0.7°C | 12°C | 44% | 8°C | 13°C | - | 4% | 0.81kPa |
| 15:00 | 0% | 0.8°C | 11°C | 46% | 8.5°C | 12°C | - | 2% | 0.78kPa |
| 16:00 | 0% | 2.6°C | 8.9°C | 54% | 8.7°C | 12°C | - | 1% | 0.62kPa |
| 17:00 | 0% | 4.2°C | 5.5°C | 69% | 8.8°C | 9.7°C | - | 2% | 0.38kPa |
| 18:00 ☾ | 0% | 3.8°C | 3.4°C | 79% | 8.6°C | 7.2°C | - | 11% | 0.22kPa |
| 19:00 ☾ | 0% | 4°C | 2.7°C | 82% | 8.3°C | 6.7°C | - | 34% | 0.17kPa |
| 20:00 ☾ | 0% | 4.4°C | 2.7°C | 83% | 8.1°C | 7.1°C | - | 96% | 0.17kPa |
| 21:00 ☾ | 1.9% | 5°C | 2.6°C | 83% | 8°C | 7.6°C | - | 100% | 0.17kPa |
| 22:00 ☾ | 1.9% | 5.1°C | 2.5°C | 85% | 7.9°C | 7.6°C | - | 100% | 0.16kPa |
| 23:00 ☾ | 1.9% | 4.8°C | 2.2°C | 86% | 7.8°C | 7°C | - | 100% | 0.14kPa |
| Thu, Feb 19
Sunrise 07:07
Sunset 17:48 | |||||||||
| 24:00 ☾ | 1.9% | 4.6°C | 2.1°C | 87% | 7.6°C | 6.7°C | - | 100% | 0.13kPa |
| 01:00 ☾ | 1.7% | 4.3°C | 1.5°C | 90% | 7.4°C | 5.8°C | - | 69% | 0.09kPa |
| 02:00 ☾ | 1.6% | 4.1°C | 1.3°C | 92% | 7.1°C | 5.4°C | - | 100% | 0.08kPa |
| 03:00 ☾ | 1.6% | 4.3°C | 1.3°C | 91% | 6.9°C | 5.6°C | - | 100% | 0.08kPa |
| 04:00 ☾ | 1.7% | 5.8°C | 1.8°C | 89% | 6.9°C | 7.6°C | - | 100% | 0.12kPa |
| 05:00 ☾ | 1.7% | 6.4°C | 2.2°C | 86% | 7°C | 8.6°C | - | 100% | 0.16kPa |
| 06:00 ☾ | 1.7% | 6.8°C | 2.4°C | 84% | 7°C | 9.2°C | - | 100% | 0.18kPa |
| 07:00 ☾ | 1.6% | 7.5°C | 2.2°C | 86% | 7.1°C | 9.7°C | - | 77% | 0.16kPa |
| 08:00 | 2.6% | 7.5°C | 3.3°C | 80% | 7.2°C | 11°C | - | 87% | 0.26kPa |
| 09:00 | 2.6% | 7.9°C | 3.7°C | 78% | 7.6°C | 12°C | - | 100% | 0.3kPa |
| 10:00 | 2.2% | 8.2°C | 2.8°C | 83% | 7.7°C | 11°C | - | 47% | 0.22kPa |
| 11:00 | 0% | 9.3°C | 2.8°C | 83% | 8.1°C | 12°C | - | 73% | 0.24kPa |
| 12:00 | 0% | 7.7°C | 3.5°C | 79% | 8.4°C | 11°C | - | 61% | 0.28kPa |
| 13:00 | 0% | 7°C | 3.6°C | 78% | 8.7°C | 11°C | - | 17% | 0.28kPa |
| 14:00 | 0% | 5.9°C | 4.5°C | 74% | 9°C | 10°C | - | 44% | 0.33kPa |
| 15:00 | 0% | 5.4°C | 4.2°C | 75% | 9.1°C | 9.6°C | - | 40% | 0.3kPa |
| 16:00 | 0% | 5.5°C | 2.9°C | 82% | 9.1°C | 8.4°C | - | 74% | 0.2kPa |
| 17:00 | 0% | 5.2°C | 2.4°C | 84% | 8.9°C | 7.6°C | - | 92% | 0.16kPa |
| 18:00 ☾ | 0% | 4.8°C | 2.3°C | 85% | 8.7°C | 7.1°C | - | 100% | 0.15kPa |
| 19:00 ☾ | 0% | 4.9°C | 2.1°C | 86% | 8.5°C | 7°C | - | 100% | 0.14kPa |
| 20:00 ☾ | 0% | 4.8°C | 1.7°C | 89% | 8.1°C | 6.5°C | - | 76% | 0.1kPa |
| 21:00 ☾ | 1.8% | 4.8°C | 1.1°C | 93% | 7.6°C | 5.9°C | - | 51% | 0.07kPa |
| 22:00 ☾ | 2.1% | 4.7°C | 0.6°C | 96% | 7.1°C | 5.3°C | - | 27% | 0.04kPa |
| 23:00 ☾ | 2.5% | 4.1°C | 0.8°C | 95% | 6.9°C | 4.9°C | - | 22% | 0.05kPa |
| Fri, Feb 20
Sunrise 07:05
Sunset 17:49 | |||||||||
| 24:00 ☾ | 2.9% | 3.5°C | 1°C | 93% | 6.6°C | 4.5°C | - | 17% | 0.06kPa |
| 01:00 ☾ | 2.9% | 3°C | 1.1°C | 92% | 6.3°C | 4.1°C | - | 12% | 0.06kPa |
| 02:00 ☾ | 3% | 3.5°C | 1.9°C | 87% | 6.4°C | 5.4°C | - | 23% | 0.11kPa |
| 03:00 ☾ | 2.6% | 3.9°C | 2.7°C | 83% | 6.4°C | 6.6°C | - | 35% | 0.17kPa |
| 04:00 ☾ | 3.6% | 4.3°C | 3.6°C | 78% | 6.5°C | 7.9°C | - | 46% | 0.23kPa |
| 05:00 ☾ | 3.7% | 4.3°C | 4.9°C | 71% | 6.9°C | 9.2°C | - | 32% | 0.33kPa |
| 06:00 ☾ | 4.1% | 4.1°C | 6.4°C | 65% | 7.3°C | 10°C | - | 19% | 0.45kPa |
| 07:00 ☾ | 4.5% | 3.7°C | 8°C | 58% | 7.8°C | 12°C | - | 5% | 0.58kPa |
| 08:00 | 0% | 3.9°C | 7.7°C | 60% | 8.1°C | 12°C | - | 5% | 0.55kPa |
| 09:00 | 0% | 4.2°C | 7.2°C | 61% | 8.4°C | 11°C | - | 5% | 0.52kPa |
| 10:00 | 0% | 4.4°C | 6.8°C | 63% | 8.8°C | 11°C | - | 6% | 0.49kPa |
| 11:00 | 0% | 4.2°C | 5.5°C | 69% | 8.6°C | 9.7°C | - | 4% | 0.38kPa |
| 12:00 | 0% | 3.8°C | 4.3°C | 74% | 8.5°C | 8.1°C | - | 3% | 0.28kPa |
| 13:00 | 0% | 3.3°C | 3.2°C | 80% | 8.3°C | 6.5°C | - | 2% | 0.19kPa |
How to read: these inputs help produce the derived score; they are not requirements by themselves.
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