In many regions of Japan, climate and temperatures vary dramatically depending on the season. In Tokyo, temperatures can reach 40 degrees Celsius in the summer and can drop to nearly 0 degrees in the winter. For this reason, when packing, guests should consider the season during which they will be traveling, as the appropriate wardrobe will differ vastly depending on the time of year.
In Japan, temperatures are measured in degrees Celsius. One might better understand the range of temperatures by considering that 100 degrees Fahrenheit is equal to about 40 degrees Celsius, and 30 degrees Fahrenheit is the approximate equivalent of 0 degrees Celsius.
In Japan, June and September mark the rainy seasons. These months are so wet that they go by the nickname use the Chinese character for "rain." On the other hand, temperatures are mild during these months and are quite comfortable on days when there is no rain.