Water droplets form ice at temperatures below the nucleation point TN and evaporate below the evaporation point TV, which is named supercooling. Superheating happens below the melting temperature of Tm. The skin supersolidity endows the premelting of ice . A droplet of 1.4 nm size becomes ice at 205 K , well below the bulk TN of 258 K . Droplets of 3.4 and 4.4 nm across transit into ice at 220 and 242 K , respectively. In contrast, a 2.5 nm droplet melts at temperatures around 50 K above the Tm of 273 K . The monolayer water and the skin of bulk water remain as liquid till 325 K and 310 K .