That's because both cities are located in the same climate zone except on the opposite hemispheres. From north to the equator there are climate zones that change every few parallels, and from the equator to the south it also happens but like a mirror image, and Jakarta and Kuala Lumpur are in the same zone.
Jakarta: in fact, it is located at a similar altitude of Kuala Lumpur (just in the opposite hemisphere), in the equatorial zone, while Baltimore is located much more north, so in a colder region.
