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 May 2025 – 31 May 2025
Rainfall over this period was 84% 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.
Rainfall vs 10-yr avg
84%
53 mm vs 62 mm typical
Rain days >5mm
4
typical: 4.0
Frost days
0
typical: 0.1
High-wind days
0
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 May 2025 | 0.6 | 8.7 | 14.5 | 18 | |
| 2 May 2025 | 0.4 | 5.7 | 15.3 | 19 | |
| 3 May 2025 | 0.1 | 6.7 | 13.8 | 29 | |
| 4 May 2025 | 0.0 | 5.7 | 10.5 | 25 | |
| 5 May 2025 | 0.0 | 3.8 | 11.5 | 19 | |
| 6 May 2025 | 0.0 | 1.5 | 15.9 | 20 | |
| 7 May 2025 | 0.0 | 4.1 | 14.1 | 23 | |
| 8 May 2025 | 0.0 | 7.1 | 13.8 | 16 | |
| 9 May 2025 | 0.0 | 5.5 | 15.3 | 20 | |
| 10 May 2025 | 0.0 | 5.2 | 17.8 | 24 | |
| 11 May 2025 | 0.2 | 7.5 | 18.4 | 19 | |
| 12 May 2025 | 11.3 | 10.8 | 18.2 | 20 | wet |
| 13 May 2025 | 0.0 | 11.0 | 19.5 | 22 | |
| 14 May 2025 | 0.0 | 9.6 | 16.0 | 23 | |
| 15 May 2025 | 0.0 | 7.8 | 17.6 | 18 | |
| 16 May 2025 | 0.0 | 7.9 | 19.8 | 15 | |
| 17 May 2025 | 0.0 | 8.4 | 19.7 | 17 | |
| 18 May 2025 | 0.0 | 11.4 | 20.8 | 22 | |
| 19 May 2025 | 0.0 | 9.1 | 15.4 | 30 | |
| 20 May 2025 | 0.7 | 9.1 | 17.3 | 19 | |
| 21 May 2025 | 0.0 | 6.1 | 19.8 | 20 | |
| 22 May 2025 | 0.1 | 7.7 | 15.5 | 20 | |
| 23 May 2025 | 5.0 | 6.6 | 17.2 | 26 | |
| 24 May 2025 | 8.8 | 13.8 | 17.7 | 34 | wet |
| 25 May 2025 | 1.1 | 9.2 | 13.8 | 42 | |
| 26 May 2025 | 8.0 | 8.2 | 12.7 | 35 | wet |
| 27 May 2025 | 2.6 | 8.5 | 13.2 | 23 | |
| 28 May 2025 | 2.8 | 10.2 | 16.4 | 25 | |
| 29 May 2025 | 7.0 | 11.8 | 18.6 | 42 | wet |
| 30 May 2025 | 0.8 | 13.1 | 19.1 | 30 | |
| 31 May 2025 | 3.2 | 11.0 | 17.5 | 37 |
4 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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