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 Jan 2026 – 31 Jan 2026
Rainfall over this period was 235% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 3 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
235%
156 mm vs 67 mm typical
Rain days >5mm
11
typical: 4.6
Frost days
5
typical: 5.1
High-wind days
3
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Jan 2026 | 0.9 | 2.8 | 5.8 | 32 | |
| 2 Jan 2026 | 1.6 | 0.6 | 3.6 | 28 | |
| 3 Jan 2026 | 0.0 | -0.9 | 2.3 | 26 | frost |
| 4 Jan 2026 | 0.2 | -1.8 | 1.4 | 20 | frost |
| 5 Jan 2026 | 0.9 | -2.0 | 1.1 | 27 | frost |
| 6 Jan 2026 | 1.5 | 0.5 | 4.3 | 34 | |
| 7 Jan 2026 | 0.1 | 2.2 | 4.6 | 37 | |
| 8 Jan 2026 | 0.7 | 0.3 | 3.2 | 13 | |
| 9 Jan 2026 | 0.8 | -1.5 | 3.6 | 12 | frost |
| 10 Jan 2026 | 2.0 | -2.2 | 4.6 | 26 | frost |
| 11 Jan 2026 | 22.0 | 4.8 | 10.9 | 50 | wet · wind |
| 12 Jan 2026 | 0.2 | 6.6 | 9.4 | 46 | |
| 13 Jan 2026 | 2.2 | 1.9 | 6.4 | 22 | |
| 14 Jan 2026 | 5.1 | 1.4 | 6.8 | 36 | wet |
| 15 Jan 2026 | 0.0 | 1.8 | 6.0 | 26 | |
| 16 Jan 2026 | 10.9 | 1.8 | 7.6 | 24 | wet |
| 17 Jan 2026 | 1.1 | 3.1 | 6.9 | 22 | |
| 18 Jan 2026 | 1.5 | 4.0 | 7.6 | 23 | |
| 19 Jan 2026 | 4.6 | 4.4 | 7.3 | 29 | |
| 20 Jan 2026 | 7.6 | 3.3 | 7.4 | 47 | wet |
| 21 Jan 2026 | 6.5 | 4.9 | 9.1 | 41 | wet |
| 22 Jan 2026 | 10.5 | 6.5 | 8.8 | 34 | wet |
| 23 Jan 2026 | 11.1 | 5.4 | 7.4 | 41 | wet |
| 24 Jan 2026 | 4.0 | 6.0 | 7.3 | 45 | |
| 25 Jan 2026 | 7.5 | 5.9 | 7.4 | 48 | wet · wind |
| 26 Jan 2026 | 9.0 | 5.1 | 5.7 | 41 | wet |
| 27 Jan 2026 | 28.3 | 3.4 | 7.6 | 64 | wet · wind |
| 28 Jan 2026 | 1.5 | 3.8 | 8.3 | 34 | |
| 29 Jan 2026 | 0.6 | 4.8 | 6.8 | 42 | |
| 30 Jan 2026 | 8.3 | 3.7 | 6.8 | 41 | wet |
| 31 Jan 2026 | 5.0 | 3.9 | 7.0 | 28 |
11 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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