In 1900, 23 tropical cyclones were observed in the western Pacific Ocean, north of the equator and west of the International Date Line. In that region of the world, cyclones that attain maximum sustained winds of at least 118 km/h (74 mph) are known as typhoons. Of the 23 storms, 13 were tracked by the Hong Kong Observatory. Activity occurred from January to December, although the bulk of the storms formed from June to November.