import arcpy

def row_to_values(row):
    values = []
    for col in row:
        if isinstance(col, unicode) and col != u'f':
            # split and convert all entries to float
            values += (float(v) for v in col.split(','))
        else:
            values.append(col)
    return values


with arcpy.da.SearchCursor(fc, fields) as cursor:
    for idx, row in enumerate(cursor):
        pt_annual_lists = []
        pt_loc = str(row[0]) +  str(" ") + str(row[1])
        for y in xrange(1991,2016,1):
             pt_year_list = []
            result = arcpy.GetCellValue_management(in_raster = "D:/temp/ras" + str(y) + ".tiff", location_point = pt_loc, band_index="")
            cell_value = result.getOutput(0)
            pt_year_list.append(cell_value)
            cell_value = [s.replace('\n', ',') for s in pt_year_list]
            pt_annual_lists.append(row_to_values(cell_value))

        # flatten list of lists
        pr_str = [val for sublist in pt_annual_lists for val in sublist]
        pr_flt = [float(i) for i in pr_str]