How important is the day of the week and is right now specifically a terrible time (Christmas and NY)?

I originally wanted to launch this Tuesday, after that this Thursday(today) but I wasn't able to get everything up and running in time.

I feel like launching on one of the remaining days this year will significantly hurt my launch but I am not basing this on any evidence/knowledge and would rather launch sooner than later. Losing anything less than 30% of impact/sales would be fine by me.

@levelsio @rikschennink do you guys observe a micro sales-dip at the end of December in sales?