New York, United States · 40.71°
Powdery Mildew in New York
2477 hours in an average year meet every threshold this disease needs in New York, peaking in August. Those add up to about 117 sustained favourable spells a year, and it is the spells rather than the scattered hours that lead to infection.
Risk in New York, next 48 hours
When conditions favour it in New York
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: 15–28°C · humidity ≥60%. 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, New York ranks 1 for hours favouring this disease in a year.
Treat, then re-check in 5–7 days
Pick off the worst material, apply the organic option below, and look again after five to seven days. If the spread continued, escalate rather than repeating the same treatment.
Scout the planting while temperatures hold between 15°C and 28°C, with humidity above 60%. Risk builds after roughly 6 unbroken hours of those conditions, so the morning after such a night is the moment to look.
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.