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Celebrity Big Brother 2017's summer series was the least watched ever

Celebrity Big Brother Summer 2017

Celebrity Big Brother 2017's summer series was the least watched yet.

An average audience of 1.3 million tuned in over the latest run over the past month.

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The summer series lasted 25 days, the shortest run for four years.

Numbers increased throughout the run, climbing from 1.2 million for the first full week of episodes to 1.3 million for subsequent week and 1.4 million for the final seven shows.

Friday and Saturday's episodes dragged the series average down. Friday's live eviction shows started earlier than usual at 8:30PM, clashing with ITV's soaps as well as MasterChef on BBC One.

And on Saturday, the highlights episode was pushed back to 10:30PM due to football highlights. The first Saturday episode of the series had just 800,000 viewers, Celebrity Big Brother's lowest ever rating. From the second week, the Saturday episode was also aired on 5Star from 9PM.

The final on Friday night averaged 1.6 million, the same figure as the very first highlights show of the series.

Celebrity Big Brother ratings

Overnight averages including Channel 5+1

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2017 Summer: 1.3 million
2017 Winter: 1.8 million

2016 Summer: 1.6 million
2016 Winter: 2.2 million

2015 Summer: 1.5 million
2015 Winter: 2.6 million

2014 Summer: 1.8 million
2014 Winter: 2.5 million

Summer's Celebrity Big Brother followed the least watched 'civilian' Big Brother series.

After wrapping up last month, the 18th Big Brother UK run averaged just under 900,000 viewers across its 54 days.

It was the lowest average to date and the first time the show dropped below a million viewers.

Both Celebrity Big Brother and Big Brother will return to Channel 5 next year for what will be the final series in the show's current contract.