a VirtualTourist member asked on Feb 18, 2014
Best time of year to go?
The best time is July, August, September, however the two shoulder seasons in April and November are good as well, and they are usually a bit less costly.
Weather is pretty good year round. Dec/Jan has the most rain fall, May-Jul has the least. Check [original link] for an overview of the averages.
That said I've been in the Dec and only had one real storm that lasted about 30 minutes. Since I would have been swimming if I'd not been hiking I just kept going as the temps were high.