It consists of 6,852 islands. The territory extends 377,975.24 km 2 (145,937.06 sq mi). 7 (2 Octorber 2008) WMO Working Group on Climate-Related Matters for Regional Association II in Tokyo, Japan (7-8 August 2008) (4 September 2008) Tokyo Climate Center: TCC News No. The summer months (June to August) are hot and sticky due to an unpleasant level of humidity, while winters (December to February) can get fairly cold. Tokyo klimaatinfo: alles over het klimaat van Tokyo zoals temperatuur, neerslag, zonneschijn en de beste reisperiodes. No heat & humidity; 43. Mean Temp: 62 °F. Pressure: 29.93 "Hg. 10 hours of daylight per day; 0. Based on weather reports collected during 1985–2015. The warmest month is August, which averages 81°F (27°C), and the coolest month is January, averaging 42°F (6°C). 13 (4 September 2008) Precipitation: 1.20" Humidity: 61%. Averages are for Tokyo Heliport, which is 9 miles from Tokyo.