plotting a color map given only some lat and lon locations with the temperatures at those locations

I have a 3 column matrix, lat,long and temperature. I want to create a color map of the country in which these readings are taken from. I dont have readings at every long/lat only about 79 locations within the country. I need to interpolate somehow so that the readings cover not only that specific spot but an area so that the whole country can be depicted in the colormap. I am able to call for the country using the following

worldmap({'Haiti','Dominican Republic'}) >> load coast >> plotm(lat, long)

that gives me an outline of the islands i am working with. Now i need to use the matrix (with 79 specific sites each defined by lat,lon and temperature) to show the avg temperature for that year.

PLEASE HELP i have been googling for hours, everything i find is people who have the third variable at every location for the area they are working with.

[Walter Roberson]

duplicates http://www.mathworks.co.uk/matlabcentral/answers/126402-how-to-create-a-2d-colormap-having-temperature-reading-at-specific-longitudes-and-latitudes