Daily rainfall, frost and wind for Swindon against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
SN1 1LD · 1 Dec 2025 – 31 Dec 2025
Rainfall over this period was 153% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 2 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
153%
96 mm vs 63 mm typical
Rain days >5mm
7
typical: 5.0
Frost days
1
typical: 7.7
High-wind days
2
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Dec 2025 | 18.6 | 6.9 | 12.1 | 43 | wet |
| 2 Dec 2025 | 0.3 | 5.4 | 9.8 | 29 | |
| 3 Dec 2025 | 0.1 | 3.0 | 8.8 | 21 | |
| 4 Dec 2025 | 5.0 | 2.4 | 7.5 | 27 | |
| 5 Dec 2025 | 9.6 | 1.3 | 9.8 | 53 | wet · wind |
| 6 Dec 2025 | 3.5 | 8.2 | 10.8 | 40 | |
| 7 Dec 2025 | 6.8 | 7.7 | 13.6 | 43 | wet |
| 8 Dec 2025 | 1.2 | 9.0 | 12.3 | 32 | |
| 9 Dec 2025 | 10.7 | 10.1 | 14.4 | 50 | wet · wind |
| 10 Dec 2025 | 0.0 | 7.8 | 11.4 | 30 | |
| 11 Dec 2025 | 0.0 | 7.1 | 11.1 | 30 | |
| 12 Dec 2025 | 1.1 | 5.1 | 11.1 | 25 | |
| 13 Dec 2025 | 0.0 | 2.5 | 9.0 | 23 | |
| 14 Dec 2025 | 0.0 | 6.7 | 10.8 | 36 | |
| 15 Dec 2025 | 6.0 | 9.5 | 11.6 | 37 | wet |
| 16 Dec 2025 | 8.0 | 2.1 | 9.8 | 21 | wet |
| 17 Dec 2025 | 0.9 | 0.6 | 10.5 | 44 | |
| 18 Dec 2025 | 21.5 | 9.3 | 11.3 | 45 | wet |
| 19 Dec 2025 | 0.0 | 5.3 | 9.4 | 30 | |
| 20 Dec 2025 | 0.0 | 4.5 | 8.6 | 24 | |
| 21 Dec 2025 | 2.1 | 7.3 | 9.5 | 25 | |
| 22 Dec 2025 | 0.9 | 8.6 | 10.7 | 26 | |
| 23 Dec 2025 | 0.0 | 5.1 | 8.7 | 32 | |
| 24 Dec 2025 | 0.0 | 2.3 | 5.0 | 41 | |
| 25 Dec 2025 | 0.0 | 1.7 | 4.1 | 39 | |
| 26 Dec 2025 | 0.0 | 1.9 | 4.7 | 30 | |
| 27 Dec 2025 | 0.0 | 0.9 | 6.2 | 37 | |
| 28 Dec 2025 | 0.0 | 4.6 | 6.2 | 29 | |
| 29 Dec 2025 | 0.0 | 3.0 | 5.1 | 24 | |
| 30 Dec 2025 | 0.0 | 0.7 | 5.3 | 23 | |
| 31 Dec 2025 | 0.0 | -2.8 | 1.4 | 18 | frost |
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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