I took a Nine day Bhutan tour with my wife in February. The weather was chilly in the mornings, but very manageable. We visited ancient fortresses, spent time in local villages, and enjoyed delicious Bhutanese food (with lots of chili!). The roads can be a bit winding, so take precautions if you're prone to motion sickness. But overall, it was one of the most enriching and peaceful travel experiences we’ve had.