The temperatures quoted are for pre-monsoon ascents, April to mid June, in the main Himalayan chain. Post-monsoon (Sep to Nov) temperatures are likely to be a little lower.
In other areas beyond reach of the monsoon (Karakoram, Pamirs, etc) climbing may continue through the summer.
For winter ascents (December to February) conditions are very different and these are not covered here. Please contact us if you have any special needs.