The first step is importing the data into Matlab. Unfortunately the lat and lon data are in degrees-minutes-decimal-seconds format, so xlsread might have some trouble with it. Maybe try removing all the degree symbols and import as space-delimited columns.
The next step is converting the dms format to decimal degrees, which you can do with dms2degrees if you have the Mapping Toolbox, or you can convert manually just by adding up the fractions of a degree and the fractions of a minute.
Then you'll have lon and lat in decimal degrees, and corresponding moisture values m. You can plot this as a color-scaled plot with the scatter function like
and if you'd like to change the colormap you might like the cmocean rain colormap for moisture.