The author of the text has successfully imported temperature data for several cities over the years into Couchbase, transformed it into time series, and plotted the data using a terminal plotting library called youplot. The author used the `UNNEST` function to transform each document in the dataset into individual documents with separate fields for date, city, and temperature. They then used the `_timeseries` function to filter the data by city and time range, and the `ARRAY_AGG` function to aggregate the temperatures for each city. The author also created a .nu file that defines a reusable function called `tempGraph` that takes a time range and an array of cities as input and generates a plot of the temperature data for those cities over the specified time period.