Large parts of Himachal Pradesh yesterday witnessed unseasonably cold conditions with the minimum temperature staying close to the freezing point owing to widespread snowfall and rainfall, weather officials said. Four persons have died due to weather-related incidents. A government spokesperson said traffic on the National Highway linking Shimla with Sumdoh bordering Indo-Tibetan border, has been disrupted at several points in Kinnaur district owing to landslides triggered by the rain and snow.