Catalyzes the formation of flavonols from dihydroflavonols (PubMed:31004005). Can act on dihydrokaempferol to produce kaempferol, on dihydroquercetin to produce quercitin and on dihydromyricetin to produce myricetin (PubMed:31004005). 2-oxoglutarate + a (2R,3R)-dihydroflavonol + O2 = a flavonol + CO2 + H2O + succinate (2R,3R)-dihydrokaempferol + 2-oxoglutarate + O2 = CO2 + H(+) + H2O + kaempferol + succinate (2R,3R)-dihydroquercetin + 2-oxoglutarate + O2 = CO2 + H(+) + H2O + quercetin + succinate (2R,3R)-dihydromyricetin + 2-oxoglutarate + O2 = CO2 + H(+) + H2O + myricetin + succinate Binds 1 ascorbate molecule per subunit. Binds 1 Fe(2+) ion per subunit. Flavonoid metabolism. Expressed in young cromes. Belongs to the iron/ascorbate-dependent oxidoreductase family.