This from the Mt Whitney Weather page (link in the Feature Topics box above left):

Cottonwood Lakes, elev. 10150' 7-day Temperatures: 37 F last night, high of 65 F.

The NOAA Whitney summit link appears a bit high in view of the actual temps shown above: Lows 35-40, highs 50-60.

There are more links on the weather page to check out.