The city experiences a southwest monsoon-influenced subtropical highland climate (''Cwb''). The southwest monsoon rainfall occurs during mid-April to September. Lightning and thunder often precedes rainfall in the region with cumulonimbus clouds and light showers dominating the weather. Continuous rainfall for several days occurs resulting in landslides and blockage of roads. Streams and rivers swell up carrying huge amounts of debris from forests. Deep puddles, thick mud, and landslides along roads form barriers to transportation. Cold winds, low temperatures at night, and moderate temperatures during the day, cloudiness, light showers and snowfall mark winter weather in this zone. Fog causes poor visibility, which poses a threat to vehicular traffic in the city. As spring approaches, the landscape is marked by violent winds and relatively dry and clear skies.