Easy Low Pass Filter

Instead of implementing a buffer and smooth it, there is a much easier and efficient way to do it. Here is a simple JavaScript implementation. First you define your accumulator function:

 function lowPass(alpha, value, acc) {
   return (value * alpha) + (acc * (1 - alpha));
 }

Then you need to define your APLHA coefficient:

 const ALPHA = 0.015;

Then you can invoke the accumulator with the aplha coefficient on the data to smooth:

 let filteredGustArray = [];
 let acc = 0;
 data.data.forEach(dp => {
   acc = lowPass(ALPHA, dp.gust, acc);
   filteredGustArray.push(acc);
 });

This produces an array containing the smoothed data. Here is a representation of what it looks like, along with the data to smooth (raw data in red, smoothed data in blue):

The demo data are available here. Just run the script with nodejs like

 $ node max.gust.js both > data.csv

This will produce a csv file you can then import into any spreadsheet program, to see the figure above.