I'll be climbing Kili in December - I know I'll need something like this for the early part of the climb, but will this be warm enough for the summit? Any other recommendations?

Tech Specs:

Material:

[shell] Marmot MemBrain with DWR 

Insulation:

[removable liner] MarmaLoft, DWR finish 

Fabric Waterproof Rating:

water-resistant 

Venting:

pitzips 

Pockets:

2 front, 1 interior 

Seams:

fully taped 

Powder Skirt:

no 

Hood:

yes, removable 

Liner-Compatible:

yes, removable liner included 

Recommended Use:

backpacking, hiking, snowsports 

Manufacturer Warranty:

lifetime