This behavior was introduced in 13w36a.
The bug
I've seen many times how a snow golem doesn't burn in the jungle. I thought, why not send it to you?
Steps to reproduce
Locate a jungle biome.
Summon a snow golem there.
Observed behavior
The snow golem will not receive damage.
I think golems should not burn in jungle, because jungle’s temperature is 0.95 and to die it must be greater than 1.0. I think is intended.