Daily rainfall, frost and wind for Swansea against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
SA1 1NW · 1 Apr 2025 – 30 Apr 2025
Rainfall over this period was 144% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year.
Rainfall vs 10-yr avg
144%
112 mm vs 77 mm typical
Rain days >5mm
7
typical: 5.4
Frost days
0
typical: 1.0
High-wind days
0
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Apr 2025 | 0.0 | 5.7 | 14.7 | 34 | |
| 2 Apr 2025 | 0.0 | 6.7 | 16.0 | 36 | |
| 3 Apr 2025 | 1.2 | 8.4 | 17.9 | 35 | |
| 4 Apr 2025 | 1.9 | 11.4 | 20.4 | 31 | |
| 5 Apr 2025 | 0.0 | 8.9 | 17.9 | 34 | |
| 6 Apr 2025 | 0.0 | 5.8 | 16.5 | 24 | |
| 7 Apr 2025 | 0.0 | 5.2 | 14.9 | 17 | |
| 8 Apr 2025 | 0.0 | 5.1 | 14.9 | 16 | |
| 9 Apr 2025 | 0.0 | 5.0 | 15.8 | 12 | |
| 10 Apr 2025 | 0.0 | 5.1 | 14.4 | 16 | |
| 11 Apr 2025 | 0.0 | 5.2 | 19.0 | 17 | |
| 12 Apr 2025 | 0.5 | 9.6 | 17.0 | 19 | |
| 13 Apr 2025 | 1.6 | 7.9 | 12.5 | 25 | |
| 14 Apr 2025 | 7.7 | 8.0 | 13.4 | 37 | wet |
| 15 Apr 2025 | 25.7 | 8.3 | 10.1 | 28 | wet |
| 16 Apr 2025 | 12.5 | 4.3 | 10.5 | 47 | wet |
| 17 Apr 2025 | 0.4 | 5.5 | 12.6 | 21 | |
| 18 Apr 2025 | 25.5 | 8.0 | 10.7 | 39 | wet |
| 19 Apr 2025 | 7.4 | 9.7 | 16.0 | 34 | wet |
| 20 Apr 2025 | 0.0 | 6.0 | 14.1 | 21 | |
| 21 Apr 2025 | 2.4 | 8.4 | 13.8 | 26 | |
| 22 Apr 2025 | 11.2 | 6.7 | 13.6 | 36 | wet |
| 23 Apr 2025 | 8.8 | 6.9 | 15.0 | 33 | wet |
| 24 Apr 2025 | 0.2 | 7.0 | 14.3 | 20 | |
| 25 Apr 2025 | 0.2 | 9.0 | 13.9 | 31 | |
| 26 Apr 2025 | 4.3 | 9.0 | 14.8 | 14 | |
| 27 Apr 2025 | 0.0 | 8.8 | 15.3 | 17 | |
| 28 Apr 2025 | 0.0 | 8.0 | 18.6 | 15 | |
| 29 Apr 2025 | 0.0 | 11.5 | 21.8 | 22 | |
| 30 Apr 2025 | 0.0 | 10.5 | 22.7 | 16 |
7 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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