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. 2022 Apr 6;6(6):bvac054. doi: 10.1210/jendso/bvac054

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© The Author(s) 2022. Published by Oxford University Press on behalf of the Endocrine Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 4. — The mean temperature and hours of sunshine in Maebashi, Japan. The data for the period when this study was performed in Maebashi City. The temperature each month is indicated by the line and hours of sunshine each month by the black bar. The data for April to December were from 2020 and the data for January to March were from 2021. The temperature was the highest in August, and the lowest temperature was in January. The hours of sunshine were highest in April and lowest in July. In Japan, there is a seasonal phenomenon called the “rainy season” in which the transition from spring to summer is marked by more rain and less sunshine than in the period before and after it. In 2020, the rainy season started on June 11 and ended on August 1, which is thought to have resulted in shorter sunshine hours in July. In addition, from the latter half of August to October, there is a phenomenon called “autumn rain” with shorter sunshine hours in September and October. These data were obtained from the Japan Meteorological Agency and Ministry of Land, Infrastructure, Transport, and Tourism. Hours of sunshine are calculated using observations from ground-based meteorological observation, and weather distribution are estimated from meteorological satellites. Historical Weather Data Search. The Japan Meteorological Agency and Ministry of Land, Infrastructure, Transport, and Tourism. https://www.jma.go.jp/jma/index.html. Accessed March 1, 2022.