We have a Coleman Hudson double which has similar specs. Fine for camping in summer but you will feel the cold in Autumn and spring. Too hot for France in summer but just use as a duvet.
We were too cold in it at the beginning of May but luckily had our mummy bags as back up.Two mummy bags aren't as nice as a double though.
I should add that my wife is a heat vampire. All my body heat gets taken away and she is still cold. That doesn't help us keeping warm and you may find your bag suits you perfectly.
Give it a try with some back up blankets on hand if you feel the chill.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets