By the looks of the US COVID death statistics, the peak is Tuesday/Wednesday/Thursday each week, with a drop every Saturday, Sunday, and Monday. Every single day last week was the worst of that particular day so far... until this week. Yesterday was the worst Tuesday and third worst day full stop, until Wednesday...
The good news is if everything goes by the same numbers we've seen so far, the single bloodiest day of the Civil War will remain in second place until next week.
1. ~6,000 - September 8, 1900 - Galveston Hurricane
2. 3,650 - September 17, 1862 - Battle of Antietam/Civil War
3. 3,400 - December 16, 2020 - COVID-19 Pandemic
4. 3,206 - December 9, 2020 - COVID-19 Pandemic*
5. 3,115 - December 10, 2020 - COVID-19 Pandemic*
6. ~3,000 - April 18, 1906 - San Francisco Earthquake
7. 2,977 - September 11, 2001 - 9/11
8. 2,971 - December 16, 2020 - COVID-19 Pandemic
9. 2,769 - May 7, 2020 - COVID-19 Pandemic
10. 2,733 - December 2, 2020 - COVID-19 Pandemic
Only one day in the worst five in this pandemic is not in December.
As noted earlier, this excludes the Spanish Flu Pandemic of 1918-1920, as detailed records were not kept; however multiple days likely exceeded even Galveston, possibly the entire month of October 1918, and some days either side.