England completed a 5-0 series victory against the West Indies despite damp conditions in Derby. Rain delayed the start of the match until 7.15pm with the duration reduced to five overs per side.
The visitors batted first and scored 41 for three from their 30 deliveries. England's response started poorly, losing two wickets for five runs. However, they limped to victory with three balls to spare despite two runouts in the final over.
It was the first time a women's Twenty20 international had been reduced to five over per innings.
England captain Heather Knight said: "It was a bizarre end to a bizarre summer. It was a bit scrappy but a good learning experience.
"It was about winning in the end and we're delighted to win the series 5-0 and finish the summer on a high."