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 Jan 2026 – 31 Jan 2026
Rainfall over this period was 142% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 5 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
142%
195 mm vs 137 mm typical
Rain days >5mm
16
typical: 9.3
Frost days
5
typical: 6.2
High-wind days
5
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Jan 2026 | 0.1 | 3.3 | 6.8 | 23 | |
| 2 Jan 2026 | 1.0 | 0.9 | 4.7 | 26 | |
| 3 Jan 2026 | 0.3 | -0.8 | 4.4 | 25 | frost |
| 4 Jan 2026 | 0.0 | -0.9 | 3.6 | 15 | frost |
| 5 Jan 2026 | 0.0 | -1.9 | 1.9 | 18 | frost |
| 6 Jan 2026 | 7.4 | -2.4 | 6.4 | 32 | wet · frost |
| 7 Jan 2026 | 0.3 | 2.8 | 6.9 | 28 | |
| 8 Jan 2026 | 19.5 | 2.3 | 6.6 | 52 | wet · wind |
| 9 Jan 2026 | 4.6 | 1.6 | 5.2 | 46 | |
| 10 Jan 2026 | 0.0 | -0.6 | 6.2 | 15 | frost |
| 11 Jan 2026 | 13.0 | 4.4 | 11.5 | 44 | wet |
| 12 Jan 2026 | 11.1 | 8.6 | 10.4 | 36 | wet |
| 13 Jan 2026 | 7.8 | 2.6 | 9.6 | 24 | wet |
| 14 Jan 2026 | 5.2 | 0.6 | 7.1 | 30 | wet |
| 15 Jan 2026 | 4.1 | 2.5 | 7.8 | 33 | |
| 16 Jan 2026 | 7.8 | 3.6 | 9.1 | 30 | wet |
| 17 Jan 2026 | 0.2 | 4.6 | 9.0 | 22 | |
| 18 Jan 2026 | 0.4 | 4.1 | 7.2 | 19 | |
| 19 Jan 2026 | 0.6 | 3.0 | 8.5 | 21 | |
| 20 Jan 2026 | 11.3 | 5.4 | 8.4 | 53 | wet · wind |
| 21 Jan 2026 | 7.7 | 4.7 | 10.8 | 43 | wet |
| 22 Jan 2026 | 8.0 | 5.3 | 9.2 | 25 | wet |
| 23 Jan 2026 | 5.6 | 4.8 | 8.2 | 47 | wet · wind |
| 24 Jan 2026 | 11.6 | 5.8 | 7.7 | 50 | wet · wind |
| 25 Jan 2026 | 1.3 | 4.8 | 8.8 | 30 | |
| 26 Jan 2026 | 9.0 | 3.7 | 7.1 | 43 | wet |
| 27 Jan 2026 | 31.2 | 6.0 | 9.8 | 57 | wet · wind |
| 28 Jan 2026 | 0.2 | 3.3 | 8.2 | 26 | |
| 29 Jan 2026 | 4.1 | 5.3 | 7.9 | 42 | |
| 30 Jan 2026 | 8.7 | 6.4 | 9.7 | 38 | wet |
| 31 Jan 2026 | 12.8 | 5.5 | 8.5 | 39 | wet |
16 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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