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 Dec 2024 – 31 Dec 2024
Rainfall over this period was 50% of the 10-year average for the same calendar window at this location. Conditions were drier than typical for the time of year. 4 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
50%
48 mm vs 96 mm typical
Rain days >5mm
2
typical: 7.2
Frost days
0
typical: 2.1
High-wind days
4
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Dec 2024 | 3.5 | 11.4 | 14.1 | 31 | |
| 2 Dec 2024 | 0.2 | 7.4 | 11.6 | 30 | |
| 3 Dec 2024 | 0.0 | 2.6 | 7.5 | 14 | |
| 4 Dec 2024 | 2.7 | 1.6 | 10.8 | 31 | |
| 5 Dec 2024 | 14.0 | 10.4 | 13.5 | 52 | wet · wind |
| 6 Dec 2024 | 2.3 | 6.4 | 12.5 | 44 | |
| 7 Dec 2024 | 5.0 | 6.5 | 12.7 | 55 | wind |
| 8 Dec 2024 | 0.9 | 6.5 | 8.1 | 51 | wind |
| 9 Dec 2024 | 0.4 | 7.3 | 8.2 | 35 | |
| 10 Dec 2024 | 0.3 | 6.7 | 7.7 | 33 | |
| 11 Dec 2024 | 0.0 | 6.2 | 7.1 | 25 | |
| 12 Dec 2024 | 0.0 | 5.1 | 7.3 | 17 | |
| 13 Dec 2024 | 0.0 | 5.0 | 6.4 | 16 | |
| 14 Dec 2024 | 0.0 | 5.1 | 8.1 | 20 | |
| 15 Dec 2024 | 0.0 | 6.1 | 12.7 | 27 | |
| 16 Dec 2024 | 0.0 | 8.8 | 11.7 | 26 | |
| 17 Dec 2024 | 0.4 | 8.2 | 10.8 | 31 | |
| 18 Dec 2024 | 10.0 | 11.8 | 13.3 | 48 | wet · wind |
| 19 Dec 2024 | 0.9 | 4.7 | 12.2 | 43 | |
| 20 Dec 2024 | 2.1 | 3.6 | 9.6 | 32 | |
| 21 Dec 2024 | 1.0 | 6.1 | 12.6 | 43 | |
| 22 Dec 2024 | 0.4 | 5.5 | 8.3 | 45 | |
| 23 Dec 2024 | 0.0 | 4.5 | 8.7 | 38 | |
| 24 Dec 2024 | 0.0 | 7.4 | 12.2 | 18 | |
| 25 Dec 2024 | 0.0 | 8.6 | 10.4 | 15 | |
| 26 Dec 2024 | 0.0 | 7.1 | 8.9 | 9 | |
| 27 Dec 2024 | 0.0 | 6.4 | 9.0 | 12 | |
| 28 Dec 2024 | 0.0 | 5.1 | 7.0 | 12 | |
| 29 Dec 2024 | 0.0 | 4.5 | 8.2 | 14 | |
| 30 Dec 2024 | 0.2 | 6.5 | 8.4 | 17 | |
| 31 Dec 2024 | 3.7 | 8.5 | 11.5 | 42 |
2 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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