In January or February, Paro and Thimphu may experience one-day snow. Punakha Dromche & Tshechu in February - The Punakha Dromche & Tshechu is a week-long celebration of the founding of Bhutan in the 1600s. ... The mild weather of lower Punakha also makes this town a great winter escape for the Bhutanese.
Good Luck!!!
Happy Travelling!!