Daily rainfall, frost and wind for Cardiff against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
CF10 1EP · 1 Dec 2025 – 31 Dec 2025
Rainfall over this period was 141% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 4 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
141%
186 mm vs 132 mm typical
Rain days >5mm
9
typical: 9.3
Frost days
1
typical: 2.5
High-wind days
4
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Dec 2025 | 24.7 | 9.0 | 12.5 | 41 | wet |
| 2 Dec 2025 | 2.5 | 5.3 | 10.0 | 31 | |
| 3 Dec 2025 | 0.0 | 4.6 | 9.0 | 16 | |
| 4 Dec 2025 | 5.2 | 3.2 | 9.0 | 31 | wet |
| 5 Dec 2025 | 16.5 | 3.1 | 10.6 | 54 | wet · wind |
| 6 Dec 2025 | 5.0 | 9.7 | 11.1 | 51 | wind |
| 7 Dec 2025 | 7.8 | 9.5 | 13.8 | 55 | wet · wind |
| 8 Dec 2025 | 4.4 | 10.4 | 12.8 | 29 | |
| 9 Dec 2025 | 21.6 | 11.0 | 14.1 | 45 | wet |
| 10 Dec 2025 | 3.7 | 8.9 | 11.7 | 37 | |
| 11 Dec 2025 | 1.0 | 8.0 | 11.7 | 28 | |
| 12 Dec 2025 | 3.8 | 6.4 | 11.0 | 30 | |
| 13 Dec 2025 | 0.0 | 5.3 | 9.9 | 19 | |
| 14 Dec 2025 | 4.5 | 8.3 | 11.3 | 30 | |
| 15 Dec 2025 | 37.5 | 9.1 | 10.9 | 30 | wet |
| 16 Dec 2025 | 11.9 | 0.6 | 9.6 | 23 | wet |
| 17 Dec 2025 | 11.5 | 0.3 | 11.2 | 46 | wet |
| 18 Dec 2025 | 14.4 | 9.1 | 11.7 | 37 | wet |
| 19 Dec 2025 | 0.0 | 7.8 | 10.2 | 31 | |
| 20 Dec 2025 | 3.6 | 6.5 | 9.4 | 33 | |
| 21 Dec 2025 | 4.4 | 6.8 | 9.5 | 27 | |
| 22 Dec 2025 | 1.8 | 8.4 | 10.5 | 28 | |
| 23 Dec 2025 | 0.1 | 6.3 | 9.5 | 32 | |
| 24 Dec 2025 | 0.0 | 3.7 | 6.1 | 43 | |
| 25 Dec 2025 | 0.0 | 3.0 | 5.4 | 49 | wind |
| 26 Dec 2025 | 0.0 | 2.7 | 5.0 | 32 | |
| 27 Dec 2025 | 0.0 | 2.7 | 6.8 | 38 | |
| 28 Dec 2025 | 0.0 | 5.5 | 6.8 | 31 | |
| 29 Dec 2025 | 0.0 | 4.1 | 5.5 | 28 | |
| 30 Dec 2025 | 0.0 | 2.6 | 6.1 | 25 | |
| 31 Dec 2025 | 0.0 | -2.6 | 3.8 | 17 | 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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