*2.2. Datasets*

#### 2.2.1. Rain Gauge Data

The daily precipitation dataset from 387 stations, between March 2014 and December 2016, were obtained from DHM Nepal (https://www.dhm.gov.np/contents/resources). The DHM stations provide daily datasets at 03 UTC. For the consistent measurement, DHM uses the same type of the United States standard eight-inch diameter manual rain gauges [53]. In addition to DHM datasets, data from a high-elevation Automatic Weather Station (AWS) located in the Everest region (27.95◦N to 86.20◦E, 5050 masl), Pyramid was also used.

**Figure 1.** The study region, Nepal is divided into three different regions and the meteorological stations used are distributed from 60 m above sea level (masl) to 5050 masl. The extent of central Himalayas is adapted from Nie et al. [54].

In total, 388 stations' data were used for evaluation of SBP products (Figure 1), which were further subjected to quality control. The remote location, unavailability of AWS, lack of regular monitoring and maintenance of rain-gauge stations are the primary causes for discontinuities in the data series. Data coverage (%) at each station between March 2014 and December 2016 is presented in the Supplementary Materials (S1). The observations from 125 gauges were used in the development of the Global Precipitation Climatology Centre (GPCC) product, which was, in turn, used to calibrate IMERG precipitation totals [55]. About 54 stations also belonged to the Global Telecommunications System (GTS) and were used for the National Oceanic and Atmospheric Administration (NOAA)/CPC analysis, which was in turn used to calibrate the daily GSMaP-Gauge product [56]. Therefore, there is a potential dependency problem between the gauge observed and gauge-corrected SBP product used in this study. The mean precipitation (mm/day) at each rain-gauge station during the study period is presented in Figure 3a.
