If it's your own blog, it still makes sense to be consistent but many (including me) just write when they feel like it.
When you're feeling particularly chatty one day, you can write a few blog posts and save them, so that you have them to post on the scheduled day, even if you're not in the mood to write on that exact day.
Try and make it a goal to post once a week. That way people will keep going to your posts. If your posts are too sporadic, people lose interest, which is why most blogs fail after 3ish month