When it's the right time to ask for a raise?

Long story short, I have an Aerospace Engineering degree with 1 year experience with the current company I work at. I started in production not working as an engineer but as a production employee, then moved to another position as a technician assistant operating HAAS machines, then to the office to work in the quality department as an administrator. So far my hourly rate is $13.50 per hour. I haven't had a raise in a year or when I was moving up positions. I understand that it's really low for engineers but I had to take that offer last year because I had no experience. The company where I work at is currently having some slowdown in production but will eventually be more busy in the upcoming months. Should I wait a couple of months more for things to start picking up again or should I do it now? Not sure when it's the right time to do it since it's my first job out of college as an engineer. I have been given more responsibilities around the office as people have seen that I have the skills to do whatever they put me to do

I currently live in California for context.

Thanks

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