Visibility is an important factor in our daily life and visibility is considered a standard meteorological parameter. The objective was to study the Long-Term Characteristic of Visibility in Thailand and Its Related Meteorological Factors. A research study of secondary data consisting of visibility data, cloud data, relative humidity data and rainfall data for a weather 3 hours for 10 years (2009 - 2018) of 43 stations (from all regions in Thailand). To study the variation and analyze the correlation by using the Rescaling (min-max normalization) ...