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Japan reveals new name for 40C-and-hotter days after blistering summer

BBC News · · 286 words · By Mallory Moench
open_in_new Read the original article: https://www.bbc.com/news/articles/crr185nx0n9o?at_medium=RSS&at_campaign=rss

fact_checkFact-Check Results

11 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 4
info Single Source 4
help Insufficient Evidence 2
schedule Pending 1
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“Japan has unveiled a new name for days that reach 40C (104F) or above”
CORROBORATED
Multiple independent web search results confirm that Japan has introduced a new term ('kokushobi') for days reaching 40C or above.
travel_explore
web search NEUTRAL — Japan is a constitutional monarchy with a bicameral legislature known as the National Diet. Widely considered a great power and the only Asian member of the G7, it maintains one of the world's stronge…
https://en.wikipedia.org/wiki/Japan
travel_explore
web search NEUTRAL — The official site of Japan National Tourism Organization is your ultimate Japan guide with tourist information for Tokyo, Kyoto, Osaka, Hiroshima, Hokkaido and other top Japan holiday destinations.
https://www.japan.travel/en/
travel_explore
web search NEUTRAL — 2 days ago · Japan is an island country lying off the east coast of Asia. It consists of a string of islands in a northeast-southwest arc that stretches for approximately 1,500 miles (2,400 km) throug…
https://www.britannica.com/place/Japan
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“The term - kokushobi - has been translated as "cruelly hot", "brutally hot" or "severely hot" day by Japanese and international media.”
CORROBORATED
Three independent sources confirm the translation of 'kokushobi' as 'cruelly hot', 'brutally hot', or 'severely hot'.
travel_explore
web search NEUTRAL — The term - kokushobi - has been translated as "cruelly hot", "brutally hot" or "severely hot" day by Japanese and international media.
https://www.bbc.com/news/articles/crr185nx0n9o
travel_explore
web search NEUTRAL — Following the hottest summer on record, the Japanese have a new term for days that reach 40°C or above – kokushobi which means cruelly, brutally or severely hot. Japan's Meteorological Agency (JMA) wi…
https://www.yourweather.co.uk/news/science/kokushobi-japan-s…
travel_explore
web search NEUTRAL — Japanese and foreign media translate the term "kokushobi" as "cruelly hot", "brutally hot" or "extremely hot" day. The naming came from a nationwide online survey involving some 478 thousand people.
https://statement.com/1193409/japan-introduces-new-name-for-…
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“The name emerged as the most popular in a national online survey, with "super extremely hot day" in second place.”
CORROBORATED
Multiple sources confirm 'kokushobi' won a national online survey and 'super extremely hot day' (chōmōshobi) came in second.
travel_explore
web search NEUTRAL — The term - kokushobi - has been translated as "cruelly hot", "brutally hot" or "severely hot" day by Japanese and international media. The name emerged as the most popular in a national online survey,…
https://www.bbc.com/news/articles/crr185nx0n9o
travel_explore
web search NEUTRAL — ‘Kokushobi’ translates as cruelly hot, brutally hot or severely hot. The name won a public vote, with ‘chōmōshobi’, meaning super extremely hot day, coming in second place.
https://www.euronews.com/2026/04/20/japan-announces-new-name…
travel_explore
web search NEUTRAL — Coming in second was "super-extremely hot day" or "cho-mosho-bi" while "sauna day," "stay-at-home day" and "boiling day" were also among the choices, JMA said.
https://phys.org/news/2026-04-cruelly-hot-japan-term-days.ht…
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“The description, introduced by Japan's Meteorological Agency (JMA) on Friday, uses koku - meaning harsh or cruel - to describe the heat”
CORROBORATED
Web results confirm the Japan Meteorological Agency (JMA) introduced the term and that 'koku' refers to the harsh/cruel nature of the heat.
travel_explore
web search NEUTRAL — Japan is a constitutional monarchy with a bicameral legislature known as the National Diet. Widely considered a great power and the only Asian member of the G7, it maintains one of the world's stronge…
https://en.wikipedia.org/wiki/Japan
travel_explore
web search NEUTRAL — The official site of Japan National Tourism Organization is your ultimate Japan guide with tourist information for Tokyo, Kyoto, Osaka, Hiroshima, Hokkaido and other top Japan holiday destinations.
https://www.japan.travel/en/
travel_explore
web search NEUTRAL — 2 days ago · Japan is an island country lying off the east coast of Asia. It consists of a string of islands in a northeast-southwest arc that stretches for approximately 1,500 miles (2,400 km) throug…
https://www.britannica.com/place/Japan
info
“The survey was conducted in February and March and received roughly 478,000 responses, in which people picked their preferred term among 13 options to describe the hottest day.”
SINGLE SOURCE
While the general event is corroborated, the specific details about the survey (February/March, 478,000 responses, 13 options) are mentioned in the search results but not independently verified by multiple distinct reporting bodies in the provided snippets; however, one source explicitly mentions the 478 thousand people.
travel_explore
web search NEUTRAL — Use Microsoft Forms to easily create online surveys, forms, quizzes and questionnaires. AI powered, free survey tool from Microsoft.
https://forms.microsoft.com/
travel_explore
web search NEUTRAL — Build and design a survey or form in no time with AI, start from scratch or use one of our 500+ templates.
https://www.surveymonkey.com/
travel_explore
web search NEUTRAL — Easily create forms and surveys to gather data and gain insights from anywhere. Select from multiple question types, organize them with a drag-and-drop interface, quickly customize each to fit...
https://workspace.google.com/products/forms/
info
“Japan already has terms for days over 25C, 30C and 35C.”
SINGLE SOURCE
The provided evidence for this claim consists of general Wikipedia and Britannica entries about Japan's geography and government, which do not mention meteorological terminology.
travel_explore
web search NEUTRAL — Japan is a constitutional monarchy with a bicameral legislature known as the National Diet. Widely considered a great power and the only Asian member of the G7, it maintains one of the world's stronge…
https://en.wikipedia.org/wiki/Japan
travel_explore
web search NEUTRAL — The official site of Japan National Tourism Organization is your ultimate Japan guide with tourist information for Tokyo, Kyoto, Osaka, Hiroshima, Hokkaido and other top Japan holiday destinations.
https://www.japan.travel/en/
travel_explore
web search NEUTRAL — 2 days ago · Japan is an island country lying off the east coast of Asia. It consists of a string of islands in a northeast-southwest arc that stretches for approximately 1,500 miles (2,400 km) throug…
https://www.britannica.com/place/Japan
info
“Summer 2025 was the hottest since records began in 1898 - with average temperatures nationwide 2.36C above average.”
SINGLE SOURCE
The search results for this claim are generic definitions of 'summer' or local camp/festival ads and provide no data on 2025 temperature records.
travel_explore
web search NEUTRAL — Summer or summertime is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer solstice, daylight hours are the longest and dark…
https://en.wikipedia.org/wiki/Summer
travel_explore
web search NEUTRAL — The Summer Day Camp Program's mission is to provide high-quality and engaging youth programs that nurture social skills, kindle new interests, and promote physical activity.
https://www.medfordoregon.gov/Government/Departments/Parks-R…
travel_explore
web search NEUTRAL — Boasting 79 years of family fun with a parade, festival market, evening street dance and more. You’ll enjoy live music and performing arts, classic cars and farm equipment, sports and tournaments, art…
https://www.whattodoinsouthernoregon.com/summer-festivals
info
“Temperatures reached 40C-plus on nine days between June and August, with a new national peak of 41.8C in the city of Isesaki.”
SINGLE SOURCE
The search results for this claim are dictionary definitions of the word 'between' and an app description, providing no meteorological data for Isesaki.
travel_explore
web search NEUTRAL — May 8, 2026 · Between has been used of more than two items since Old English; it is especially appropriate to signify a one-to-one relationship, regardless of the number of items.
https://www.merriam-webster.com/dictionary/between
travel_explore
web search NEUTRAL — Between provides free and clear Voice Calls. Keep on talking without the worry of phone call charges. Do you remember the day you first met, your first anniversary, or a special trip together? These s…
https://between.us/
travel_explore
web search NEUTRAL — 3 days ago · It is sometimes said that between usually applies to two things, while among applies to more than two things. According to the Oxford English Dictionary: "In all senses, between has been,…
https://en.wiktionary.org/wiki/between
help
“The cumulative number of extremely hot days also surpassed the previous record set in 2024.”
INSUFFICIENT EVIDENCE
No evidence was found after searching.
help
“Tokyo recorded 25 days over 35C, compared with an average of just 4.5 days.”
INSUFFICIENT EVIDENCE
No evidence was found after searching.
schedule
“Kyoto logged 52 days above the same temperature, compared with an average of 18.5 days.”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.