Originally a small-sized fishing village by the name of Edo, which means estuary, Tokyo started with humble roots and beginnings. The Edo Clan built the Edo Castle in the year 1590 and eventually, the area would become the capital of Japan and be renamed Tokyo. Tokyo is actually made up of various small-sized towns and regions that are each governed as if they were small cities. This makes Tokyo a unique metropolis. Tokyo also has many islands that round out the city structure.
The weather here, in Tokyo is considered to be humid sub-tropical. It typically enjoys warm humid summer weather with cooler weather in the winter months that may have period os cold snaps. Much of Japan experiences seasonal lags of a month.
The warmest month for the region is typically the month of August with an average of 26.4 Celsius or 79.5 Fahrenheit. The coldest month is typically January averaging 5.2 Celsius or 41.4 Fahrenheit. There are also some record lows which are -9.2 Celsius or 15.4 Fahrenheit in January of 1876.
The record high for the region is 39.5 Celsius or 103.1 Fahrenheit in July of 2004. The annual rainfall for the region is approximately 60.2 inches or 1,530 millimeters. Snowfall is sporadic but they do tend to receive some nearly every year. As with any sub-tropical climate, there are typhoons annually and while few of these are strong, they do occasionally hit hard and may dump as much as 10.6 inches or 270.5 millimeters of water on the area all at once.
Outlying cities may vary significantly in weather patterns from the mainland area of Tokyo. Chichi-Jima, which lies in Ogasawara village, is right on a boundary between the tropical savanna climate and the subtropical humid climate. For this reason, it tends to get an eclectic mix of both climates. Due to their location, they tend to get more of the typhoons and more rainfall than the main area of Tokyo proper.
The wettest month for the region tends to be in the month of June. This is the time that the typhoons seem to hit and the rain seems to fall the heaviest. It’s not unusual for the region to get its annual rainfall all at once with just a bit of rain in the other months of the year.
April brings winds to the region and it’s not at all unusual for the area to have 11.5 mph winds on a frequent basis. Certainly no competition for the windy city in the U.S. but still, a force to be reckoned with.
Average daily temperatures make this sub-tropical climate an enjoyable venture for visitors and residents alike. With a humidity level of approximately 44 percent in the month of January, the weather is tolerable and easy to adjust to.
July seems to be the most humid month averaging at 76 percent humidity and trailing back down to 44 percent humidity by January. Each month the humidity will adjust slightly so most people don’t really notice the change in humidity unless they’re not used to a humid sub-tropical climate.