Try subtracting the average yearly temperature for computing the labels

[georgemilosh]

Currently we are mixing years which start very cold and very warm in summer. Probably it is easier and more interesting to predict if there is 14 day anomaly above this level

[AlessandroLovo]

What level? This issue is not clear

[georgemilosh]

So currently heatwaves are defined as events that are above 95 percentile relative to the climatological anomaly. For practical applications it could important to look at the absolute temperatures, but another possibility is to subtract the seasonal temperature of the previous month, or the temperature of May. I guess that's what I meant by level, but perhaps the title and the description is not very clear.