Coverage shows valid readings received; the reporting interval is unknown, so a percentage is unavailable. Gaps may understate rainfall and are not treated as dry weather.
Water fills show relative rainfall, not flood risk. Hourly cards use rainfall intensity; 24 hours uses recorded wet-day percentiles; longer totals use estimated seasonal pace for the elapsed period. Grey means there is insufficient coverage or history for a comparison.
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Comparisons use complete past observations, including events with little rise. Ground wetness is estimated from preceding rainfall.
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Greater London gets about 636 mm of rain a year on average (wettest month October, 68 mm; driest March, 38 mm). That is 45% drier than the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 3.1 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Reference
HYRAIN_d29e5bcbebd2d1e5812bb5d2aef3d2f8e7817fe7
Source
EA Hydrology archive
Coordinates
51.59188, -0.116695
County
Greater London
Data from
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