It’s strange, isn’t it? I would have made it act like a clock. It’s interesting to note that the Maps’ icon is a map of Infinite Loop, Cupertino, where Apple’s main headquarters are located.
I’m in Australia and Apple’s Australian website screenshot shows the Weather icon at 23 degrees, whereas on the main Apple website it shows the weather as 73 degrees, the icons never change, but they’ve set it in the region format…. maybe other countries have different times on their Clock icons as well? I guess countries which observe different calendars must have different calendar icons too?