data japan 2024Japan in numbers: demographics, economy, energy, climate and more data and comparisons with other countries. ... Global warming by continentsTemperature increase and weather extremes from 1955 to 2025 for individual continents.Key information about Japan population. The Japan population reached 123.7 million people in Dec 2025, compared with the previously reported fure of 124.3 million people in Dec 2025;