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 2025 – 31 Dec 2025
Rainfall over this period was 125% of the 10-year average for the same calendar window at this location. Conditions were broadly in line with typical for the time of year. 5 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
125%
121 mm vs 96 mm typical
Rain days >5mm
10
typical: 7.2
Frost days
1
typical: 2.1
High-wind days
5
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Dec 2025 | 14.1 | 9.2 | 12.3 | 55 | wet · wind |
| 2 Dec 2025 | 5.6 | 7.7 | 10.4 | 26 | wet |
| 3 Dec 2025 | 1.9 | 6.8 | 10.0 | 26 | |
| 4 Dec 2025 | 11.7 | 3.5 | 9.6 | 37 | wet |
| 5 Dec 2025 | 10.7 | 1.8 | 11.0 | 62 | wet · wind |
| 6 Dec 2025 | 5.7 | 9.7 | 12.2 | 42 | wet |
| 7 Dec 2025 | 9.5 | 9.9 | 13.9 | 48 | wet · wind |
| 8 Dec 2025 | 5.2 | 11.6 | 13.0 | 30 | wet |
| 9 Dec 2025 | 14.1 | 11.9 | 14.5 | 49 | wet · wind |
| 10 Dec 2025 | 0.4 | 9.0 | 12.6 | 31 | |
| 11 Dec 2025 | 0.1 | 9.4 | 10.9 | 28 | |
| 12 Dec 2025 | 0.5 | 7.3 | 12.0 | 31 | |
| 13 Dec 2025 | 0.0 | 3.3 | 8.6 | 17 | |
| 14 Dec 2025 | 0.7 | 8.4 | 11.0 | 33 | |
| 15 Dec 2025 | 5.8 | 10.0 | 11.1 | 35 | wet |
| 16 Dec 2025 | 1.5 | 5.4 | 11.5 | 29 | |
| 17 Dec 2025 | 0.2 | 1.6 | 10.8 | 36 | |
| 18 Dec 2025 | 25.9 | 10.7 | 12.6 | 56 | wet · wind |
| 19 Dec 2025 | 0.1 | 7.8 | 11.1 | 29 | |
| 20 Dec 2025 | 2.7 | 7.2 | 9.9 | 27 | |
| 21 Dec 2025 | 3.6 | 8.8 | 11.0 | 32 | |
| 22 Dec 2025 | 0.9 | 8.5 | 11.8 | 35 | |
| 23 Dec 2025 | 0.0 | 6.4 | 9.3 | 29 | |
| 24 Dec 2025 | 0.0 | 3.5 | 6.3 | 39 | |
| 25 Dec 2025 | 0.0 | 2.7 | 5.4 | 41 | |
| 26 Dec 2025 | 0.0 | 0.8 | 6.2 | 29 | |
| 27 Dec 2025 | 0.0 | 2.9 | 7.7 | 37 | |
| 28 Dec 2025 | 0.0 | 4.7 | 7.4 | 29 | |
| 29 Dec 2025 | 0.0 | 3.2 | 6.3 | 24 | |
| 30 Dec 2025 | 0.0 | 2.2 | 6.6 | 25 | |
| 31 Dec 2025 | 0.0 | -1.5 | 3.4 | 19 | frost |
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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