I'm doing the popular tourist trek from Lukla to Everest base camp in late April / early May. I know the minimum temperature is on average -1 Celsius (30.2 Fahrenheit) in the Khumbu region at this time but am wondering what temperature to prepare for in terms of buying kit.
I want to ensure I am comfortable in the later, higher, stages of the trek and if the weather takes a nasty turn. I am planning to use lodges and tea houses but do not want be complacent either.
So basically, what's the lowest extreme of temperature am likely to encounter?