Temperatures while trekking Daytime temperatures will be in the high 20s falling to 5° C at night between 1000 m and 3500 m. At higher altitudes temperatures range from about 20° C during the day down to -10° C at night.

Rainfall As a guide, rainfall in Thimphu and Paro is about 25mm a month in January to March, rising to 50 mm in April and May, 75mm in June, and then a whopping 355mm in July, 300mm in August, 125mm in September, back down to 75mm in October, 25 mm in November and 0 in December.