The mountain ridges supporting Darevsky's viper have unique climate conditions. They compose the coldest and the most humid region of the Armenian Highland. The average annual precipitation here is about . Even during the hottest and driest months of July and August, hot days lead to intensive evaporation of humidity and cloud formation. Almost every evening, aggregating clouds release some, often heavy, showers and remoisturize the environment. At night temperatures regularly drop down to just 4-6 °C (39-43 °F), and morning sunrays regularly have to cut through the dense fog, before they reach the east-facing slopes and provide heat necessary for functioning of this viper. In some north-facing patches, close to the watersheds and summits of mountain ridges, some residual snow and ice never melts. Such patches as a rule are unsuitable for snakes. Suitable patches of rocky deposits are mainly situated on the steep and warmest south-facing and southeast-facing slopes of deep mountain valleys within an elevation range of 2300–3000 m (7,550-9,840 ft) above sea level.