EXTPRT
EXPERIMENTAL LONGRANGE FOR TROFA
EXPERIMENTAL FORECAST OFFICE - PORTO METRO
05:22 UTC THU DEC 25 2025
Long-Range Forecast - Trofa
Issued: 05:22 UTC Thu Dec 25 2025 | Valid: 15 days
| Date | Conditions | Low | High | Notes |
|---|---|---|---|---|
| Dec 25 | Clear | 2°C | 11°C | Dry, calm. Good day for outdoor activities. |
| Dec 26 | Clear | 0°C | 11°C | Dry, but near-freezing overnight. Pack warm layers for evening. |
| Dec 27 | Clear | 2°C | 12°C | Dry, light wind. Brief showers cannot be ruled out. |
| Dec 28 | Clear | 5°C | 14°C | Dry, breezy. Mild for late December. |
| Dec 29 | Clear | 3°C | 15°C | Dry. Warmest day of the period. Ideal for outdoor plans. |
| Dec 30 | Clear | 3°C | 13°C | Dry. Cooler high temperatures return. |
| Dec 31 | Overcast | 1°C | 8°C | Dry. Cloudy skies, cool. Wind not expected. |
| Jan 1 | Mainly Clear | 0°C | 9°C | Trace rain possible (1.2mm, 10% chance). Frost possible overnight. |
| Jan 2 | Light Drizzle | -1°C | 7°C | Light rain up to 17h, low accumulation. Wind gusts to 32km/h. Freezing temps overnight. |
| Jan 3 | Clear | 0°C | 7°C | Dry, breezy. Frost likely. Brief drizzle possible (13% chance). |
| Jan 4 | Clear | -2°C | 8°C | Dry. Coldest night of period. Frost widespread. Freezing temps overnight. |
| Jan 5 | Light Drizzle | 4°C | 9°C | Light rain (7.3mm), mainly overnight. Gusts to 44km/h. |
| Jan 6 | Light Drizzle | 6°C | 10°C | Rain (20.7mm), steady. Breezy (gusts to 76km/h). Travel delays possible. |
| Jan 7 | Light Drizzle | 7°C | 9°C | Rain continues (8.5mm), persistent. Windy (gusts to 74km/h). |
| Jan 8 | Clear | 3°C | 8°C | Dry. Brief drizzle possible (23% chance). Cooler again. |
Trend Summary
After a dry and mild stretch through December 29, temperatures begin to cool through the new year. A brief period of light rain and wind arrives January 5–7, with the highest chance of sustained wet weather and breezy conditions midweek. The coldest night is expected January 4, with temperatures near -2°C—frost and icy patches possible on untreated surfaces. Freezing overnight temperatures occur multiple times between December 26 and January 4, so exposed pipes and plants may be at risk. The pattern shifts from dry and stable to unsettled in early January, then clears by January 8.
No snow is indicated in any model runs. However, brief freezing drizzle or sleet cannot be entirely ruled out during the overnight hours of January 2 and January 4, especially if precipitation timing overlaps with sub-zero wet-bulb temperatures. Any such event would be brief and localized, with no significant accumulation expected—even on grass or elevated surfaces.
Model guidance shows stable temperature and precipitation trends in recent runs, with low spread. Confidence is high through December 30, moderate through January 4, and decreases slightly for January 5–7 due to uncertainty in rainfall duration and intensity.
Practical advice:
- December 25–29: Excellent conditions for outdoor activities.
- December 26–January 4: Pack warm layers at night; watch for frost on roads and walkways.
- January 5–7: Prepare for wet, breezy conditions. Secure loose outdoor items. Consider delaying non-essential travel during peak rain.
- January 8: Return to dry, cooler weather. Good recovery window.
Experimental forecast - not official guidance