R code for articles I wrote on medium: https://medium.com/@deepak.gulati/visualising-temperatures-in-amsterdam-as-a-heatmap-in-r-part-i-7e1be1e251c0 https://medium.com/@deepak.gulati/visualising-temperatures-in-amsterdam-as-a-heatmap-in-r-part-ii-92db6b37a5e1