The "normal value", which shows the average value of temperature and precipitation in each region, will be updated in May for the first time in 10 years.
In addition to rising temperatures in various regions, there are also places where precipitation increases by about 10%, reflecting a series of heavy rain disasters.
The "normal value" is an average value for the past 30 years for evaluating the occasional weather such as temperature and precipitation, and the weather such as "cold summer" and "warm winter", and is reviewed by the Japan Meteorological Agency once every 10 years.
This year is the year of renewal, and the values recalculated from the data from 1991 to 2020 have been released, but the average annual temperature is higher in each region than the average values so far until 2010. I will.
By region, it
increased by
0.4 degrees in eastern
Japan, 0.3 degrees in northern and western Japan, and 0.2 degrees in
Okinawa and Amami
.
By location,
▽ Utsunomiya City and Mito City are 0.5 degrees,
▽ Tokyo city center, Nagoya City, Sendai City Takamatsu City, Saga City, etc. are 0.4 degrees
higher, and
cherry blossoms are 1 at most points nationwide. It's been two days earlier than the day.
In addition, precipitation has increased in many places reflecting the heavy rain disasters that occurred one after another every year, and the increase of about 10% was in
▽ summer on the Sea of Japan side of northern and western Japan, and
▽ autumn on the Pacific side of eastern and western Japan. It has become.
Although winter precipitation is increasing almost nationwide, snowfall is decreasing at many points, reflecting a warm winter trend, with some decreasing by more than 30%.
According to the Japan Meteorological Agency, "In addition to the progress of global warming, the heat island phenomenon due to urbanization is thought to be behind the rise in average temperature."
Operation of the new normal value will begin on May 19.