Daily rainfall, frost and wind for Colchester against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
CO1 1PJ · 1 Sept 2025 – 30 Sept 2025
Rainfall over this period was 70% of the 10-year average for the same calendar window at this location. Conditions were drier than typical for the time of year. 1 day had gusts at or above 47 mph.
Rainfall vs 10-yr avg
70%
38 mm vs 54 mm typical
Rain days >5mm
3
typical: 3.7
Frost days
0
typical: 0.0
High-wind days
1
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Sept 2025 | 5.5 | 13.3 | 20.1 | 33 | wet |
| 2 Sept 2025 | 1.0 | 11.7 | 18.7 | 30 | |
| 3 Sept 2025 | 14.8 | 15.4 | 20.0 | 41 | wet |
| 4 Sept 2025 | 0.9 | 13.0 | 18.8 | 34 | |
| 5 Sept 2025 | 0.1 | 10.5 | 20.6 | 18 | |
| 6 Sept 2025 | 0.0 | 11.3 | 20.9 | 27 | |
| 7 Sept 2025 | 0.0 | 15.9 | 25.6 | 30 | |
| 8 Sept 2025 | 0.1 | 13.4 | 20.3 | 23 | |
| 9 Sept 2025 | 0.2 | 9.3 | 19.9 | 15 | |
| 10 Sept 2025 | 2.2 | 13.6 | 18.3 | 32 | |
| 11 Sept 2025 | 0.6 | 11.2 | 18.4 | 36 | |
| 12 Sept 2025 | 1.7 | 10.2 | 17.8 | 32 | |
| 13 Sept 2025 | 0.9 | 10.8 | 17.5 | 29 | |
| 14 Sept 2025 | 6.5 | 8.3 | 17.4 | 35 | wet |
| 15 Sept 2025 | 0.4 | 13.9 | 18.4 | 49 | wind |
| 16 Sept 2025 | 0.0 | 11.7 | 18.1 | 38 | |
| 17 Sept 2025 | 1.7 | 11.1 | 18.9 | 36 | |
| 18 Sept 2025 | 0.0 | 15.9 | 22.3 | 35 | |
| 19 Sept 2025 | 0.0 | 13.9 | 24.7 | 21 | |
| 20 Sept 2025 | 0.3 | 13.2 | 22.0 | 36 | |
| 21 Sept 2025 | 0.0 | 9.2 | 15.0 | 38 | |
| 22 Sept 2025 | 0.0 | 7.1 | 15.2 | 26 | |
| 23 Sept 2025 | 0.1 | 5.7 | 15.4 | 26 | |
| 24 Sept 2025 | 0.0 | 9.2 | 16.7 | 25 | |
| 25 Sept 2025 | 0.0 | 9.3 | 17.2 | 28 | |
| 26 Sept 2025 | 0.1 | 9.8 | 14.9 | 21 | |
| 27 Sept 2025 | 0.5 | 8.2 | 16.3 | 23 | |
| 28 Sept 2025 | 0.7 | 10.5 | 17.2 | 19 | |
| 29 Sept 2025 | 0.0 | 7.4 | 16.9 | 14 | |
| 30 Sept 2025 | 0.0 | 6.5 | 17.2 | 12 |
3 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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