The main thing would be any moisture in your garage. If it's dry and the temperature doesn't swing wildly then I don't see anything wrong with it.

You might still want to check to see what the minimum temperature is in the specifications for your hardware though. Some stuff isn't rated for below 0 usage.

You got any spiders or other random insecty things in your garage?

35C? When was that!?! I'm in the south east as well and it's been ages since it was that!

- Trevor