The big increase in the murder rate in the United States in 2020 has carried over to 2021.

A sample of 37 cities with data available for the first three months of this year shows murder up 18 percent relative to the same period last year.

In the midst of a volatile period in crime, keeping track of trends has become especially important so that the police and local officials can tailor prevention policies.

But as it happens, this year’s national crime release will be the last of its kind as the F.B.I. transitions to a crime reporting system that will affect the public’s ability to evaluate trends locally and nationally.

On Monday, the F.B.I. released preliminary statistics showing a major increase in murder last year, with a 25 percent rise in agencies that reported quarterly data. The F.B.I. did not receive data from several cities with known big increases in murder like New York, Chicago and New Orleans, but cities of all sizes reported increases of greater than 20 percent.

A 25 percent increase in murder in 2020 would mean the United States surpassed 20,000 murders in a year for the first time since 1995. (The final official numbers for 2020 will not be released until late September.)

Although it’s not clear what has caused the spike in murder, some possibilities are the various stresses of the pandemic; the surge in gun sales during the crisis; and less belief in police legitimacy related to protests over police brutality.

The trend in the early months this year is not necessarily indicative of where things will end up in 2021. Most obviously, the pandemic may mostly recede by summer because of widespread vaccination, and a broad reopening of public life may change the dynamic that has led to the rise in violence.

It may also be harder to assess trends in crime more generally, particularly those other than murder, with the F.B.I. phasing out its use of one data source.

The Uniform Crime Report was begun in 1929 to serve as the nation’s repository of crime data. On Jan. 1, it made arguably its biggest change in its century of existence. The eventual result should be more detailed information about crime, but it will probably come at the price of less confidence in reported crime figures over the next few years.

The F.B.I. has two basic national crime data collection systems that it relies on to create estimates of local and national trends. One is the Summary Reporting System (S.R.S.), which has two main problems.

First, agencies use a “hierarchy rule,” meaning they count only the most serious offense in an incident. If a burglar assaults a homeowner, the assault is counted, while the burglary is not. Or if a murder takes place during a robbery, only the murder is recorded. Second, there are only seven main categories of national crime data (arson is so underreported that the F.B.I. does not estimate national figures), so data on crimes like vandalism, fraud and kidnapping is not collected.

To address these deficiencies, on Jan. 1 the F.B.I. stopped collecting data via the S.R.S. and switched to the National Incident Based Response System (NIBRS).

This newer system, started in 1988, collects data on a much wider array of offenses, though this data was not used until now for the Uniform Crime Report. NIBRS does away with the hierarchy rule; agencies can report on up to 10 different offenses in a single episode.

Agencies also report substantially more details on things like where crimes occur; the relationship between offender and victim; and how much of what drug was seized in a drug raid. As the F.B.I. points out, for example, a concerned citizen can use the system to see how many kidnappings occur at day care centers each year.

“The move to NIBRS will be a huge leap forward for understanding crime and victimization,” said Jerry Ratcliffe, a professor of criminal justice at Temple University and host of the “Reducing Crime” podcast. “It may help police departments that have a strong analytical capacity advance their crime prevention strategies.”

Although phasing out S.R.S. will have benefits, the switch-over presents short-term challenges. For a start, it isn’t known how many agencies will actually report crime data in 2021 using the newer system.

The Bureau of Justice Statistics said in an email that the F.B.I. took a survey in April 2020 to determine how many agencies planned to make the transition: “The results of that survey indicated 75 percent of law enforcement agencies (representing 81 percent of the U.S. population) were committed to transitioning to NIBRS by the Jan. 1, 2021, deadline.”

That would be well below the roughly 90 percent of eligible agencies that annually report data under S.R.S., and it’s unclear how many agencies made the switch this year.

“Many police departments have not moved forward quickly enough to embrace the move to NIBRS,” Mr. Ratcliffe said. “I suspect this is due to a lack of knowledge about NIBRS, staffing challenges of the pandemic, and the impact of other more immediate pressures on police departments.”

The Bureau of Justice Statistics says it has “been working on a set of estimation procedures, with input and support from the F.B.I., to generate national crime statistics based on the reported NIBRS data.” Even in the best case, however, the number of murders reported nationally in 2021 will be much more of an estimate than we are generally used to, and it will be challenging to assess crime trends for the next few years.

Another reason it will be hard to compare crime statistics in 2021 with previous years is that eliminating the hierarchy rule will undoubtedly lead to an increase in the number of crimes reported.

This shouldn’t have much effect on the number of murders reported each year, because murder sits atop the hierarchy. But there may be increases in other types of offenses that could create some misleading headlines.

The F.B.I. estimated in 2014 that 11 percent of all criminal episodes involved multiple offenses, and that converting to NIBRS would lead to a 2 percent increase in offenses.

The upside to the new system will be more insight into a wider array of crimes at both the local and national level. But the expected growing pains will occur during a period when reliable reporting of crime trends may be particularly relevant.

Jeff Asher is a crime analyst based in New Orleans and co-founder of AH Datalytics. You can follow him on Twitter at @Crimealytics.

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