Weather forecasters warn ground frost is possible the next nights. The weather will remain unstable by the middle of May, Info-Prim Neo reports. According to Ilie Boian, deputy director of the State Hydrometeorology Service, there will be up to four degrees of frost in most parts of Moldova on the night of April 19. The frosts in early spring can seriously affect the agricultural crops and trees, when they sprout or are in blossom.