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 Apr 2025 – 30 Apr 2025
Rainfall over this period was 95% 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.
Rainfall vs 10-yr avg
95%
34 mm vs 35 mm typical
Rain days >5mm
3
typical: 3.0
Frost days
0
typical: 0.0
High-wind days
0
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Apr 2025 | 0.0 | 5.0 | 14.0 | 32 | |
| 2 Apr 2025 | 0.0 | 6.6 | 15.6 | 38 | |
| 3 Apr 2025 | 1.1 | 8.9 | 17.0 | 30 | |
| 4 Apr 2025 | 0.3 | 11.3 | 20.7 | 30 | |
| 5 Apr 2025 | 0.0 | 8.1 | 17.8 | 34 | |
| 6 Apr 2025 | 0.0 | 6.3 | 15.9 | 25 | |
| 7 Apr 2025 | 0.0 | 4.9 | 14.6 | 21 | |
| 8 Apr 2025 | 0.0 | 4.4 | 14.3 | 15 | |
| 9 Apr 2025 | 0.0 | 4.8 | 13.4 | 21 | |
| 10 Apr 2025 | 0.0 | 3.6 | 12.3 | 17 | |
| 11 Apr 2025 | 0.0 | 4.2 | 15.5 | 17 | |
| 12 Apr 2025 | 0.0 | 8.8 | 16.0 | 22 | |
| 13 Apr 2025 | 8.7 | 9.0 | 13.9 | 30 | wet |
| 14 Apr 2025 | 1.6 | 6.9 | 12.1 | 29 | |
| 15 Apr 2025 | 3.2 | 9.6 | 14.9 | 39 | |
| 16 Apr 2025 | 0.5 | 7.5 | 12.5 | 47 | |
| 17 Apr 2025 | 0.0 | 4.9 | 13.9 | 21 | |
| 18 Apr 2025 | 5.7 | 9.1 | 12.3 | 33 | wet |
| 19 Apr 2025 | 2.0 | 8.9 | 16.4 | 36 | |
| 20 Apr 2025 | 0.0 | 6.0 | 14.6 | 28 | |
| 21 Apr 2025 | 2.0 | 7.7 | 13.7 | 23 | |
| 22 Apr 2025 | 0.0 | 6.0 | 13.4 | 25 | |
| 23 Apr 2025 | 7.9 | 8.5 | 14.9 | 36 | wet |
| 24 Apr 2025 | 0.4 | 7.5 | 14.1 | 19 | |
| 25 Apr 2025 | 0.0 | 7.9 | 12.4 | 18 | |
| 26 Apr 2025 | 0.1 | 8.4 | 16.1 | 16 | |
| 27 Apr 2025 | 0.0 | 7.7 | 17.2 | 20 | |
| 28 Apr 2025 | 0.0 | 7.1 | 18.1 | 15 | |
| 29 Apr 2025 | 0.0 | 9.9 | 21.1 | 21 | |
| 30 Apr 2025 | 0.0 | 10.5 | 21.8 | 17 |
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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