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Is it okay to use krylon primer in colder temps? Atm its about -4 C.

Should be fine, but you should warm the primer in a bowl of warm water and get it a bit warmer than room temperature. I’d also Suggest shaking the can really, really well. Also make sure the nozzle is clean and don’t hold the primer too far away, the recommended 20cm is too far imo, do 10cm and do quick passes, and do 2 thin coats and lastly, wow, what a ramble, if you’re unsure test on a gak model or some plastic, it sucks ruining a whole batch over some bad/old primer. The cold in itself shouldn’t have an impact on the result as long at the contents of the can is warm.

Take some crap model and try on it. I personally think that if the distance between primer and model is too small, and the weather is too cold/damp, you are risking clogging the details.

Ideally you should keep the primer in a warm place all the time or anywhere above 5 degrees, polymers that freeze (The base material that makes paint) will get destroyed and leave you with a paint that cannot be shaken back to life if kept too long below zero.

But getting back on point, if the paint is fine, you can use it just as normally as you would any other spray paint, though if you're doing it in the cold, it might take longer for the paint to dry so best to do it at room temperature at least.

Pay attention to the humidity when you attempt.

Follow the directions on the can.
Follow the directions on the can.

The can should have instructions on temperature and humidity.

the thing i know helps is to put the can in some hot water for like 10 minutes making sure water does not get on the top or tip, then wiping the excess water off and shaking it like you got a pair then using it.

alternatively you could spray inside a garage quickly then vent the space