OCN is a three letter abbreviation that stands for: 1  OCLC Control Number, a bibliographic record identifier. 2  In Oncology nursing, an Oncology Certified Nurse. 3  Opaskwayak Cree Nation. 4  Open College Network.
Autumn is from September to November and is characterised by light breezes and cooler temperatures of around 46-50ÂºF. Itâs during autumn that many exhibitions, music concerts and sports tournaments are held in Japan.
Spring (March-May) is the perfect season to visit Tokyo. Thatâs when Japanâs famous Blossom festival happens, beginning with plum trees in February through to March and April with cherry blossom flower festival. See More: Tokyo Weather: How Japan Weather Affects YOUR Vacation. See Also: Best Time to visit Tokyo.