DegatsDesert

                int i = MathHelper.floor_double(this.posX);
                int j = MathHelper.floor_double(this.posZ);
                ItemStack helmet = event.entityLiving.getCurrentItemOrArmor(4);

                if(event.entityLiving.worldObj.getBiomeGenForCoords(i, j).getFloatTemperature() > 1.0F)
                {
                    if (helmet != null)
                    {
                        if (helmet.getItem() == Item.helmetIron || helmet.getItem() == Item.helmetLeather || helmet.getItem() == Item.helmetDiamond || helmet.getItem() == Item.helmetIron)
                        {
                            return;
                        }
                    }
                    else
                    {
                        if (event.entityLiving.worldObj.rand.nextInt(100) == 0)
                        {
                            event.entityLiving.attackEntityFrom(DamageSource.onFire, 1.0F);
                        }
                    }
                }