“…The land area of North Sumatra Province is 72,981.23 km². In North Sumatra, each region has a different topography, so it has different weather conditions [12]. Each observation station represents the area being researched, such as bw1 station representing urban areas, blw and kno stations representing east coast areas, tsi stations representing highland areas, sba stations representing west coast areas, gsi stations representing nias islands, kds stations representing plains areas low and agd stations represent relatively mountainous and steep areas.…”