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 Jan 2026 – 31 Jan 2026
Rainfall over this period was 193% 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
193%
105 mm vs 54 mm typical
Rain days >5mm
7
typical: 3.8
Frost days
9
typical: 10.2
High-wind days
0
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Jan 2026 | 0.0 | -0.7 | 5.6 | 37 | frost |
| 2 Jan 2026 | 0.4 | -1.7 | 2.5 | 29 | frost |
| 3 Jan 2026 | 0.2 | -2.0 | 1.5 | 31 | frost |
| 4 Jan 2026 | 0.0 | -3.5 | 1.2 | 22 | frost |
| 5 Jan 2026 | 0.3 | -3.3 | 0.6 | 24 | frost |
| 6 Jan 2026 | 1.0 | -5.3 | 2.3 | 29 | frost |
| 7 Jan 2026 | 4.5 | 0.6 | 5.1 | 37 | |
| 8 Jan 2026 | 13.4 | 0.2 | 5.1 | 37 | wet |
| 9 Jan 2026 | 7.7 | 1.4 | 5.6 | 35 | wet |
| 10 Jan 2026 | 1.5 | -2.9 | 3.4 | 30 | frost |
| 11 Jan 2026 | 1.4 | -3.1 | 6.9 | 36 | frost |
| 12 Jan 2026 | 0.7 | 7.6 | 10.4 | 37 | |
| 13 Jan 2026 | 7.6 | 6.9 | 10.3 | 21 | wet |
| 14 Jan 2026 | 1.1 | -1.7 | 7.7 | 20 | frost |
| 15 Jan 2026 | 14.8 | 6.6 | 8.8 | 33 | wet |
| 16 Jan 2026 | 0.5 | 3.3 | 9.4 | 26 | |
| 17 Jan 2026 | 0.5 | 5.1 | 9.3 | 16 | |
| 18 Jan 2026 | 0.0 | 6.2 | 9.8 | 15 | |
| 19 Jan 2026 | 1.6 | 5.5 | 10.3 | 18 | |
| 20 Jan 2026 | 0.7 | 6.4 | 9.6 | 32 | |
| 21 Jan 2026 | 11.5 | 5.0 | 8.9 | 39 | wet |
| 22 Jan 2026 | 4.9 | 6.1 | 8.2 | 31 | |
| 23 Jan 2026 | 1.0 | 5.7 | 7.6 | 32 | |
| 24 Jan 2026 | 0.0 | 4.8 | 7.9 | 30 | |
| 25 Jan 2026 | 3.4 | 4.6 | 6.3 | 29 | |
| 26 Jan 2026 | 0.0 | 2.9 | 4.8 | 25 | |
| 27 Jan 2026 | 16.4 | 4.6 | 7.4 | 40 | wet |
| 28 Jan 2026 | 0.0 | 1.0 | 7.7 | 19 | |
| 29 Jan 2026 | 0.0 | 1.8 | 4.9 | 19 | |
| 30 Jan 2026 | 9.2 | 4.0 | 9.3 | 32 | wet |
| 31 Jan 2026 | 0.3 | 4.9 | 9.4 | 22 |
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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