Daily rainfall, frost and wind for Belfast against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
BT1 5GS · 1 Dec 2025 – 31 Dec 2025
Rainfall over this period was 112% of the 10-year average for the same calendar window at this location. Conditions were broadly in line with typical for the time of year. 2 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
112%
101 mm vs 90 mm typical
Rain days >5mm
9
typical: 6.1
Frost days
2
typical: 2.5
High-wind days
2
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Dec 2025 | 13.1 | 6.0 | 9.2 | 33 | wet |
| 2 Dec 2025 | 0.0 | 4.1 | 7.5 | 31 | |
| 3 Dec 2025 | 2.7 | 3.0 | 7.4 | 22 | |
| 4 Dec 2025 | 10.5 | 2.1 | 7.8 | 31 | wet |
| 5 Dec 2025 | 12.8 | 1.8 | 9.4 | 48 | wet · wind |
| 6 Dec 2025 | 2.2 | 6.0 | 9.6 | 24 | |
| 7 Dec 2025 | 10.7 | 6.0 | 9.6 | 31 | wet |
| 8 Dec 2025 | 1.0 | 6.9 | 10.2 | 35 | |
| 9 Dec 2025 | 14.3 | 7.6 | 14.0 | 66 | wet · wind |
| 10 Dec 2025 | 1.2 | 7.9 | 10.2 | 45 | |
| 11 Dec 2025 | 2.3 | 6.6 | 11.6 | 37 | |
| 12 Dec 2025 | 0.0 | 3.8 | 7.7 | 23 | |
| 13 Dec 2025 | 1.9 | 5.2 | 11.2 | 41 | |
| 14 Dec 2025 | 1.5 | 8.9 | 13.1 | 41 | |
| 15 Dec 2025 | 0.0 | 2.8 | 8.6 | 22 | |
| 16 Dec 2025 | 0.0 | 0.3 | 4.8 | 17 | |
| 17 Dec 2025 | 6.0 | 3.6 | 11.5 | 37 | wet |
| 18 Dec 2025 | 6.7 | 4.4 | 10.3 | 35 | wet |
| 19 Dec 2025 | 0.0 | 4.5 | 8.4 | 41 | |
| 20 Dec 2025 | 0.2 | 4.9 | 8.9 | 38 | |
| 21 Dec 2025 | 6.0 | 7.3 | 8.6 | 34 | wet |
| 22 Dec 2025 | 6.9 | 7.9 | 9.5 | 26 | wet |
| 23 Dec 2025 | 1.3 | 7.2 | 8.9 | 19 | |
| 24 Dec 2025 | 0.0 | 4.6 | 7.9 | 21 | |
| 25 Dec 2025 | 0.0 | 4.3 | 5.9 | 28 | |
| 26 Dec 2025 | 0.0 | 4.3 | 5.9 | 27 | |
| 27 Dec 2025 | 0.0 | 3.4 | 7.2 | 25 | |
| 28 Dec 2025 | 0.0 | 4.6 | 7.0 | 25 | |
| 29 Dec 2025 | 0.0 | 2.7 | 5.6 | 19 | |
| 30 Dec 2025 | 0.0 | -1.6 | 5.6 | 18 | frost |
| 31 Dec 2025 | 0.0 | -2.3 | 3.3 | 31 | frost |
9 days with rainfall over 5 mm in this period.
Data: ERA5 reanalysis via Open-Meteo, taken at the nearest model grid point to the postcode — not a Met Office station record. Baselines are the mean of the same calendar months over the previous 10 years at this location. Whether conditions meet a contractual test (e.g. JCT “exceptionally adverse weather” or an NEC 1-in-10-year event) is a matter for the contract — this is a factual weather record, not advice.
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