Yes Harbin Ice and Snow World usually opens from December to February only...

It depends on how icy the ground is at the time that you are there. Most of the ground was flat so it was easy for my wife to get around using a walker. This is different to a wheelchair as the weight of the person using it is distributed over four wheels and less likely to get bogged in wet ice. I am going to ask the guide who showed us around the park if he thinks they should hire a similar walker so that more disabled people can see the sculptures.

Best period to visit is January....

I was there mid January during the week and a Chinese National Holiday period. It is busy, but I didn't feel the crowd was overwhelming or too much. People are not bumping into you and you do not feel jostled as you walk around (during the day or in the evening).

Yes it's during school holidays ..went second week of Jan, however the town/ city is certainly worth a visit just hope the cathedral is open for you, was under renovation/restoration early this year.plenty to do but is worth changing your plans just to see the Ice Festival...much is free. Good luck

No, it is a winter event

No! Too warm by June.

No it's summer then