The most recent calculation puts the current rate at 73.2 per 100,000 people, based on 148 new coronavirus cases in the week to April 2. The week prior, to March 26, the rate was 108.3, with 219 new cases recorded.
The last time Peterborough's infection rate was below 100 per 100,000 people was in October.
In the week to October 10, the case rate was estimated at the same figure it is today, March 7, but at that time cases were rising. Between October 3 and October 10 the rate jumped from 59.3 to 73.2.
Public Health England data also confirms that there have been zero Covid-19 deaths recorded in Peterborough since March 25. This is the first time since October 3 that the seven-day average of deaths in Peterborough has been at zero.
It was confirmed on Monday that the second stage of lockdown easing will take place from April 12, with non-essential retail, hairdressers and pub beer gardens able to reopen from this date.
This, said the Prime Minister, was "fully justified by the data" although he warned Britons not to be complacent.
Mr Johnson said: "We can’t be complacent. We can see the waves of sickness affecting other countries and we have seen how this story goes.
"We still don’t know how strong the vaccine shield will be when cases begin to rise, as I’m afraid that they will, and that’s why we are saying please get your vaccine – or your second dose – when your turn comes."