When you choose your yeast you can look it up online.
If you used US-05 fermentis, which is what I would have used for Galaxy Pale Ale, you can look at this pdf
http://www.fermentis.com/wp-content/uploads/2012/02/SFA_US05.pdf
It says:
fermentation temperature 12-25°C (53.6-77°F) ideally...