Daily rainfall, frost and wind for Portsmouth against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
PO1 2EG · 1 Jan 2025 – 31 Jan 2025
Rainfall over this period was 161% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 7 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
161%
133 mm vs 83 mm typical
Rain days >5mm
10
typical: 5.7
Frost days
6
typical: 5.7
High-wind days
7
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Jan 2025 | 17.4 | 5.7 | 11.7 | 57 | wet · wind |
| 2 Jan 2025 | 0.0 | -0.5 | 6.3 | 20 | frost |
| 3 Jan 2025 | 0.0 | -1.4 | 3.9 | 13 | frost |
| 4 Jan 2025 | 7.0 | -1.0 | 5.1 | 36 | wet · frost |
| 5 Jan 2025 | 32.0 | 3.8 | 12.5 | 44 | wet |
| 6 Jan 2025 | 5.8 | 3.1 | 11.8 | 53 | wet · wind |
| 7 Jan 2025 | 1.5 | 1.6 | 6.4 | 27 | |
| 8 Jan 2025 | 7.6 | 0.2 | 3.6 | 25 | wet |
| 9 Jan 2025 | 0.3 | -0.4 | 4.0 | 25 | frost |
| 10 Jan 2025 | 0.0 | -1.5 | 3.9 | 18 | frost |
| 11 Jan 2025 | 0.0 | -0.7 | 5.1 | 14 | frost |
| 12 Jan 2025 | 0.0 | 0.8 | 5.6 | 12 | |
| 13 Jan 2025 | 0.0 | 3.6 | 6.2 | 23 | |
| 14 Jan 2025 | 0.0 | 3.3 | 10.1 | 14 | |
| 15 Jan 2025 | 0.0 | 5.1 | 10.5 | 11 | |
| 16 Jan 2025 | 0.0 | 5.2 | 9.2 | 15 | |
| 17 Jan 2025 | 0.0 | 4.1 | 6.7 | 16 | |
| 18 Jan 2025 | 0.0 | 3.0 | 4.6 | 15 | |
| 19 Jan 2025 | 0.5 | 2.6 | 3.8 | 16 | |
| 20 Jan 2025 | 0.0 | 2.9 | 7.4 | 10 | |
| 21 Jan 2025 | 0.0 | 2.1 | 6.4 | 19 | |
| 22 Jan 2025 | 1.3 | 3.4 | 5.2 | 15 | |
| 23 Jan 2025 | 7.8 | 2.9 | 9.0 | 51 | wet · wind |
| 24 Jan 2025 | 8.8 | 8.4 | 10.7 | 56 | wet · wind |
| 25 Jan 2025 | 1.0 | 3.3 | 9.0 | 26 | |
| 26 Jan 2025 | 14.5 | 4.4 | 9.0 | 60 | wet · wind |
| 27 Jan 2025 | 14.1 | 6.2 | 9.7 | 57 | wet · wind |
| 28 Jan 2025 | 0.7 | 6.9 | 9.9 | 48 | wind |
| 29 Jan 2025 | 9.0 | 3.4 | 8.1 | 28 | wet |
| 30 Jan 2025 | 0.0 | 2.0 | 7.9 | 28 | |
| 31 Jan 2025 | 3.9 | 3.1 | 9.8 | 32 |
10 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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