Negronis are my summer drink. A few years ago, they were obscure and now it seems every cocktail bar and mediocre "mixologist" has some horrible version of it… which is hard to do when they only have 3 ingredients.
My autumn go-to drink has been the Boulevardier. Take the negroni and swap the gin for bourbon: 1.5oz bourbon, 1oz campari, 1oz sweet vermouth. Add an orange twist and youre done.