Visualize calendar data in R

Last week, I visualized the days I did sports in 2017 by hand with illustrator. Most of the time, we want however re-tell similar data (I am not giving up sports anytime soon!), so I always look for ways to create visualizations computationally, for example in R. Therefore, today, I show you how to make a viz of data on days of a year in R.

First step: googling (or: duckduck-ing) to find a package other people use for this type of visualization. To my surprise, this took a very long time! Apparently, there is no default package in R that can visualize calendar data!? I found a very laborious solution that someone made with ggplot (referenced here:, but it was > 10 lines of code. I then stumbled upon another package, made specifically for visualizing pollutants in air (!), but it works also for other data and is straightforward to use. openair” takes any dataframe with a “date”-column in the standard format (YYYY-MM-DD) and plots whatever you define as the “pollutant”. In my case, the days I did sports were the “pollutant”.

3 easy steps:

  1. Open your data in R, I called my dataframe “sports”.
  2. Then load library(openair)
  3. Plot: calendarPlot(sports, pollutant = “Sports”, year = 2017)


Red: days I did sports, yellow: lazy days, white: sick days.

Screen Shot 2018-01-14 at 10.35.29

CalendarPlot() takes a lot more arguments, so you can adjust the colorscheme, labelling of the days and so forth.





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