Time Series Charts: COVID-19

Data updated: March 12, 2021.

The chart below shows the number of new daily cases of COVID-19 reported by each state and accumulated and published by The COVID Tracking Project.

The data show most states witnessed a rapid increase in cases beginning around October 1. This was approximately six weeks before the U.S. Thanksgiving holiday week began. Some states, maybe even most saw a peak around the Thanksgiving and December winter holidays. But the start of increase of the autumn surge for many states began well before the holiday period.

Hawaii was an exception. This state had a peak of infections in August-September.

The District of Columbia, New Jersey and New York showed two peaks, one in the Spring 2020 and another around mid-Autumn 2020. There was a months-long reprieve in between the two peaks for each of these states or federal districts.

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Several states have reported data which likely requires cleaning up due to excessing peaks, both positive and negative. This might be due to incorrect data points. The spiking may be due to one-time data corrections. It is unlikely that swings in new cases occurred naturally from one day to another. We will look into this data in deeper detail over the next few days.

These states include: Missouri, New Jersey and New York.

DATA SOURCES:
The COVID data is provided by John Hopkins University (JHU) School of Medicine and used in accordance with a Creative Commons CC BY 4.0 License.

Prior to JHU, the COVID data was provided by the COVID Tracking Project (CTP) at The Atlantic and used in accordance with a Creative Commons CC BY 4.0 License. The CTP ceased updating data on March 7, 2021. Further updates were continued by JHU.