Here's the code used to scrape HN API, kinda hacky: https://github.com/bfung/HNAnalytics
Here's the data and the a chart on [google sheets](https://docs.google.com/spreadsheets/d/18kLWHkrEedpl1eXzAht_se8GEKd0G9zrlz7SutP2uLQ/edit#gid=846434603)
A few things stick out: Dec and Jan are low job post months, as it makes sense due to holidays and fiscal cycles, and it shows in the # of posts.
Hope this helps would be job hunters in preparing for the next few months.