Bus 916 in December

916 operates starting at Dongzhimen from 05:50 to 19:50 and starting at Huairou from 04:50 to 18:50.
Hope it is useful for you.

I would advice that you take the hotel tour services and it's very informative. The weather is very very cold and windy. Even colder than Germany at times with the wind.

You will enjoy it more in the bus and not having to flag down taxis which are difficult to come by if you do not speak the language. They wanted to charged us for RMB100 from The Temple of Heaven to our Hotel at Crowne Plaza. We managed to get one for RMB20.

They are all out to make money from tourists.