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Lightning flashes are rare albeit hazardous events. Despite this scarcity,generalized additive models (GAMs) succeed in producing a climatology oflightning occurrence for the eastern Alps and surrounding lowlands at anunprecedented resolution of 1\,km$^2$ for each day of April through Septemberwith data from the ALDIS lightning location system. The GAM adds the effects ofseasonality, jaggedness of the terrain, and seasonally varying effects ofelevation and region, thus combining information from analysis cells sharingsimilar characteristics. The probability of a cloud-to-ground discharge over1\,km$^2$ on a given day is typically less than 1\,\% with a rapid increase inspring, followed by a plateau and a gentler tapering-off in fall. Probabilitiesearly are lower at high elevations but increase once their snow cover is gone.Regional patterns of lightning also vary with season with an overall southwardshift later in the year but more complex details. Grid cells with jaggedtopography have a higher probability of lightning.

Daily-Resolved Lightning Climatology of the Eastern Alpine Region at the Kilometer Scale