The weather varies across different parts of Bhutan. Depending on the altitude, the climate varies from semi-tropical to alpine. In Thimphu, the capital city, the temperature ranges from -2.5°C in winter to 25°C in summer. In Southern Bhutan, the climate is tropical in the monsoon season and may range from 15°C in winter to 30°C in summer. The east is also warmer than the west. The centre enjoys sub-tropical climate with very cool winters while the northern parts of the country have harsh climate including snowfall two to three times every winter.