Haha, i'm not used with the common English names of most frogs.
If it's right that it is the Hyla versicolor it can withstand a lot more dryness then most.
Just make sure not to let the viv dry out, but 50% would be sufficient enough to keep them healthy.

Now i know the species and looking at the place you;re from,
best thing i can advise is put one RV metre outside and try to get the viv at that rate.
This species can be found in Ontario as well, so putting it outside solves you're problem already