London, United Kingdom · 51.51°
Sooty Mould in London
922 hours in an average year meet every threshold this disease needs in London, peaking in September. Those add up to about 52.2 sustained favourable spells a year, and it is the spells rather than the scattered hours that lead to infection.
Risk in London, next 48 hours
When conditions favour it in London
Hours in an average month when conditions meet every threshold this disease declares (2021–2025). Faded bars are months the database does not list the problem as active.
This disease's thresholds: 15–30°C · humidity ≥75%. Every hour in the archive was tested against them.
These come from the ERA5 reanalysis on a roughly 9 km grid, so they describe the area rather than your plot. A shaded, sheltered corner holds leaf wetness longer than open ground, so conditions there can favour it more often than the figure suggests. This is a climate profile, not a forecast — the panel above carries the current risk.
How this compares
Of the 13 locations published here, London ranks 8 for hours favouring this disease in a year.
Watch it before you act
At this level the damage rarely costs the crop. Note the date, check twice a week, and act only if it reaches new growth or the weather turns favourable for it.
Scout the planting while temperatures hold between 15°C and 30°C, with humidity above 75%.
Wind-blown spores. Spores travel on air well beyond the affected bed, so a neighbouring garden can be the source. Spacing and airflow matter more than distance from your own infected plant.