Daily rainfall, frost and wind for Bolton against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
BL1 1RU · 1 May 2026 – 31 May 2026
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%
111 mm vs 77 mm typical
Rain days >5mm
8
typical: 4.6
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 2026 | 5.9 | 7.7 | 19.4 | 19 | wet |
| 2 May 2026 | 2.6 | 7.1 | 15.5 | 15 | |
| 3 May 2026 | 8.6 | 8.7 | 12.3 | 22 | wet |
| 4 May 2026 | 0.9 | 7.0 | 13.2 | 19 | |
| 5 May 2026 | 0.3 | 4.6 | 11.8 | 22 | |
| 6 May 2026 | 0.1 | 4.9 | 10.7 | 19 | |
| 7 May 2026 | 0.2 | 5.3 | 13.0 | 21 | |
| 8 May 2026 | 1.6 | 6.7 | 15.6 | 19 | |
| 9 May 2026 | 7.0 | 6.7 | 14.8 | 27 | wet |
| 10 May 2026 | 0.0 | 4.4 | 11.2 | 25 | |
| 11 May 2026 | 1.8 | 4.9 | 10.1 | 25 | |
| 12 May 2026 | 2.8 | 3.5 | 10.7 | 38 | |
| 13 May 2026 | 15.2 | 5.0 | 10.5 | 35 | wet |
| 14 May 2026 | 3.2 | 2.9 | 10.5 | 29 | |
| 15 May 2026 | 0.0 | 3.8 | 9.5 | 23 | |
| 16 May 2026 | 4.6 | 3.6 | 9.6 | 19 | |
| 17 May 2026 | 5.0 | 6.5 | 11.9 | 26 | |
| 18 May 2026 | 7.2 | 5.4 | 13.1 | 19 | wet |
| 19 May 2026 | 19.4 | 8.8 | 14.7 | 30 | wet |
| 20 May 2026 | 5.2 | 9.4 | 14.4 | 31 | wet |
| 21 May 2026 | 2.1 | 9.4 | 18.4 | 23 | |
| 22 May 2026 | 0.4 | 13.1 | 22.8 | 25 | |
| 23 May 2026 | 1.1 | 11.5 | 18.3 | 18 | |
| 24 May 2026 | 0.0 | 10.5 | 21.0 | 12 | |
| 25 May 2026 | 0.0 | 14.2 | 28.2 | 14 | |
| 26 May 2026 | 0.0 | 17.1 | 27.1 | 23 | |
| 27 May 2026 | 0.0 | 12.2 | 21.1 | 28 | |
| 28 May 2026 | 13.0 | 11.0 | 24.7 | 28 | wet |
| 29 May 2026 | 0.1 | 12.1 | 18.7 | 25 | |
| 30 May 2026 | 0.0 | 10.1 | 20.0 | 17 | |
| 31 May 2026 | 2.7 | 12.1 | 16.3 | 25 |
8 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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