Came here to say electrician. Or anything related to utility (gas, electric, water, Internet, transportation) maintenance. These are often "we need someone 365 days a year" jobs, because they are literally the ones maintaining infrastructure for the rest of us, but those jobs also pay well and are in demand everywhere there are people.

If you're not qualified for that stuff, consider starting with something like Flagging/traffic control. You'll start as the poor sap holding a sign in the rain, but you can study and eventually become the person who designs/approves the traffic control plans, etc etc. Pretty much all utility work requires traffic control.

Surveying/Right of Way/GIS, if you'd rather work in a cube