Answer: Rainfall is scarce.
Explanation:
Coniferous forests are one of the coldest biomes of the world. They exhibit very low annual rainfall, short summers and hot and cold and long winters. The temperatures of the region exhibit long range. They are dominated by the vegetation cover of coniferous trees which exhibit adaptations like needles instead of leaves and cones instead of flowers which preserves seeds. The leaves and flowers are absent because of scanty rainfall and low sunlight which are necessary for photosynthesis and blooming of flowers.