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Temperature observation results
Last Updated October 27, 2023
The Institute of Environmental Science conducts temperature observations at multiple elementary schools in the city every year in order to understand the heat situation in the city, which has become hot due to global warming and the heat island phenomenon.
This page contains the temperature observation results for 2023 and past observations.
For more information on measures taken by the Institute of Environmental Science's efforts to combat urban heat, please also see the City Heat Countermeasures page.
Temperature Observation Results in 2023
Observation results from July to August (summer)
The average temperature from July to August at all observation points reached the highest level of the past 10 years - The number of days in midsummer, hot days, and tropical nights have updated records at the most observation points ~
From July to August, all points observed for each point compared with the observations over the past 10 years (1925 to 4) for each point. ※The average temperature was the highest, and the heat was severe throughout the city.
In addition, records have been updated at locations where the highest number of summer days, hot days, and tropical nights have been updated.
(* We observed at 36 locations in the city from July to August, but this is the result of 34 locations in the city due to missing two locations.)
Click here for details on the observation results from July to August (summer).
Temperature Observation Results in September
The average temperature in Yokohama City in September was the highest since the start of observation-~ The number of days in midsummer and tropical nights have reached the highest record.
Since the temperature observation in September, the monthly average temperature has been the highest since 2014, and the heat was severe in September, following the heat was severe in September, following the July-August, when the entire city was intense.
Especially in mid-September, the hot time zone became longer.
Click here for more information about the results of the observations in September.
List of 2023 and Past Temperature Observation Results
Temperature observation results from July to August (summer) in 2023 and the past 10 years (2013-4)
Year |
Number of observation points |
Temperature (°C) |
Number of days by index (Sun) (*1) |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Average temperature by month |
Average temperature(*2) |
Maximum temperature |
Midsummer days |
Days of hot days |
Tropical night days |
||||||||
July |
August |
Average |
Best |
Minimum |
Maximum number |
Minimum |
Maximum number |
Minimum |
Maximum number |
Minimum |
|||
2013 | 43 | 26.6 | 28.5 | 27.6 | 28.3 | 26.7 | 39.9 | 50 | 37 | 18 | 2 | 39 | 16 |
2014 | 43 | 26.1 | 26.9 | 26.5 | 27.1 | 25.7 | 37.0 | 41 | 26 | 13 | 0 | 31 | 7 |
2015 | 43 | 26.2 | 27.0 | 26.6 | 27.2 | 25.8 | 38.0 | 40 | 31 | 13 | 0 | 40 | 11 |
2016 | 44 | 25.5 | 27.4 | 26.5 | 27.4 | 25.6 | 40.2 | 43 | 24 | 9 | 1 | 32 | 4 |
2017 | 44 | 27.2 | 26.7 | 27.0 | 27.8 | 26.1 | 38.0 | 49 | 29 | 8 | 0 | 37 | 10 |
2018 | 44 | 28.2 | 28.3 | 28.2 | 29.1 | 27.3 | 39.4 | 53 | 40 | 19 | 1 | 51 | 25 |
2019 | 44 | 24.4 | 28.6 | 26.5 | 27.1 | 25.6 | 37.9 | 40 | 26 | 14 | 0 | 37 | 19 |
2020 |
43 | 24.5 | 29.4 | 26.9 | 27.8 | 26.0 | 38.3 | 38 | 29 | 20 | 0 |
36 | 8 |
2021 | 41 | 26.1 | 27.6 | 26.9 | 27.7 | 25.9 | 37.8 | 46 | 30 | 10 | 0 | 40 | 9 |
2022 | 36 | 27.3 | 27.7 | 27.5 | 28.3 | 26.6 | 37.8 | 48 | 33 | 9 | 0 | 44 | 22 |
2023 | 36 | 28.5 | 29.2 | 28.8 | 29.6 | 28.0 | 39.4 | 60 | 51 | 26 | 2 | 54 | 20 |
(※1) Minimize the number of days at the highest point in each year and the lowest number of days at the lowest point.
(※2) The average temperature at the highest point in each year and the lowest average temperature at the lowest point.
Temperature observation results for 2023 and the last nine years (2014-4)
Year |
Number of observation points |
Number of points to be analyzed | Temperature (°C) |
Number of days by index (Sun) (*3) |
||||||
---|---|---|---|---|---|---|---|---|---|---|
Average temperature(*4) |
Maximum temperature |
Midsummer days |
Tropical night days |
|||||||
Average |
Best |
Minimum |
Maximum number |
Minimum |
Maximum number |
Minimum |
||||
2014 | 43 | 41 | 22.8 |
23.6 |
21.9 | 32.6 | 9 | 0 | 2 | 0 |
2015 | 43 | 43 | 22.9 | 23.7 | 21.9 | 32.1 | 9 | 0 | 1 | 0 |
2016 | 44 | 44 | 24.6 | 25.5 | 23.9 | 35.1 | 14 | 5 | 11 | 0 |
2017 | 44 | 42 | 23.0 | 23.9 | 22.1 | 34.0 | 8 | 1 | 0 | 0 |
2018 | 44 | 41 | 23.1 | 23.8 | 22.4 | 34.0 | 10 | 2 | 5 | 1 |
2019 | 44 | 44 | 25.4 | 26.1 | 24.4 | 36.3 | 16 | 8 | 7 | 0 |
2020 |
43 | 43 | 24.6 | 25.3 | 23.8 | 36.3 | 14 | 9 | 12 | 2 |
2021 | 41 | 41 | 22.7 | 23.3 | 21.9 | 33.7 | 6 |
1 | 1 | 0 |
2022 | 36 | 36 | 24.8 | 25.4 | 23.9 | 35.1 | 18 | 1 | 6 | 1 |
2023 | 34 | 34 | 26.9 | 27.5 | 26.1 | 36.1 | 24 | 17 | 20 | 2 |
(※3) Minimize the number of days at the highest point in each year and the lowest number of days at the lowest point.
(※4) The average temperature at the highest point in each year and the lowest average temperature at the lowest point.
Previous summer press release materials
Temperature observation results in Yokohama City in the summer of 2013 (PDF: 434KB)
Temperature observation results in Yokohama City in the summer of 2014 (PDF: 319KB)
Temperature observation results in Yokohama City in the summer of 2015 (PDF: 466KB)
Temperature observation results in Yokohama City in the summer of 2016 (PDF: 712KB)
Temperature observation results in Yokohama City in the summer of 2017 (PDF: 804KB)
Temperature observation results in Yokohama City in the summer of 2018 (PDF: 820KB)
Temperature observation results in Yokohama City in the summer of 2019 (PDF: 456KB)
Temperature observation results in Yokohama City in the summer of 2020 (PDF: 634KB)
Temperature observation results in Yokohama City in the summer of 2021 (PDF: 1,312KB)
Temperature observation results in Yokohama City in the summer of 2022 (PDF: 1,612KB)
Related links
Measures against heat in cities
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For inquiries to this page
Environmental Conservation Department, Green Environment Bureau
Phone: 045-453-2550
Phone: 045-453-2550
Fax: 045-453-2560
Email address: mk-kanken@city.yokohama.lg.jp
Page ID: 470-390-206