Roofing is a job 6-7 months of the year in the Midwest. Most contractors hire on a job by job basis, so it isn't steady, but build multiple connections and you can stay busy.
Other construction is job based, length depends on type of project. A house being built can keep a crew busy all summer long. A lot of remodeling can be a couple days to a couple weeks per project. Having specific skills help.
Tree trimming can be pretty steady in season, more sporadic when trees not growing because then it is mostly just storm cleanup, and you have to be able to move quickly to where the most recent disaster occured.
All of this is job-based temporary for a contractor, typically hiring for each job, but prove yourself and you get asked back.
