The study used long time series of precipitation data (12–30 years) with a 1-min resolution from five Norwegian cities. Figure 1 presents the location and the annual precipitation of the five Norwegian cities. Bergen is the wettest city among the five, based on the amount of annual precipitation, followed by Kristiansand while Hamar city is the driest one. The five cities cover three climatic classes, based on the Köppen Geiger classification system (Kottek et al. 2006), as presented in Table 1. The precipitation data are collected and quality-checked (Lutz et al. 2020) by the Norwegian Meteorological Institute (MET). Hence, no further data processing has been done to the precipitation data.