GB/T 38950-2020.Cooling summer grades.
1 Scope
GB/T 38950 specifies the index, calculation method and classification of cool summer for single stations, regions and the whole country.
GB/T 38950 is applicable to the monitoring, prediction, evaluation, scientific research and services of cool summer.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Single station weather station
A meteorological observation station, also known as a station or a site.
[GB/T 33675-2017, definition 2.4]
2.2
Region region
A certain geographical range.
Note 1: Such as natural climate zone, administrative district, river basin, etc., not including the whole country.
Note 2: Rewrite GB/T 33675-2017, definition 2.5.
2.3
Climatological normals
The 30-year average of the meteorological variable in the last three consecutive whole decades.
Note 1: The climatological normal is updated every 10 years. The variables in 2000 and before use the average of 1961-1990 as their climatological average, the variables between 2001 and 2010 use the average of 1971-2000 as their climatological average, the variables between 2011 and 2020 use the average of 1981-2010 as their climatological average, and so on.
Note 2: Rewrite GB/T 33675-2017, definition 2.2.
2.4
summer mean air temperaturesummer mean air temperature
The average temperature from June to August of the year.
Note: The unit is Celsius (°C).
2.5
summer mean air temperature anomaly
The difference between the summer mean temperature and its climate mean.
Note: The unit is Celsius (°C).
2.6
cooling summer
A summer with a lower summer mean temperature than its climate mean.
Note: According to the occurrence range, it can be divided into single-station cool summer, regional cool summer and national cool summer, and according to the occurrence intensity, it can be divided into weak cool summer and strong cool summer (cold summer).
2.7
cooling summer index
A quantity reflecting the degree of cool summer.
Note: Includes single-station cool summer index, regional cool summer index and national cool summer index.
This standard specifies the index, calculation method and classification of cool summer for single stations, regions and the whole country. This standard is applicable to the monitoring, prediction, evaluation, scientific research and services of cool summer.

ICS07.060
National Standard of the People's Republic of China
GB/T38950—2020
Cooling summergrades
Published on 2020-07-21
State Administration for Market Regulation
National Standardization Administration
Implementation on 2020-07-21
This standard was drafted in accordance with the rules given in GB/T1.1-2009. This standard was proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Climate and Climate Change Standardization (SAC/TC540). GB/T38950—2020
Drafting units of this standard: Wuhan Regional Climate Center, Shenzhen Shenzhongyuan Technology Co., Ltd., Fujian Climate Center, Hubei Meteorological Service Center.
The main drafters of this standard are: Hong Guoping, Gan Miao, Yang Chengshuang, Zou Yan, Ren Yongjian. SAC
1 Scope
Cool summer grades
This standard specifies the index, calculation method and grade classification of cool summer for single stations, regions and the whole country. This standard applies to the monitoring, prediction, evaluation, scientific research and services of cool summer. Terms and definitions
The following terms and definitions apply to this document. 2.1
weatherstation
A meteorological observation station, also known as a station or site. [GB/T33675-2017 definition 2.4]
region
A geographical scope.
Note 1: Such as natural climate zones, administrative regions, river basins, etc., do not include the entire country. Note 2: Rewrite GB/T33675—2017, definition 2.5. 2.3
Climatological average
climatological normalsbzxZ.net
The average value of the meteorological variable in the last three consecutive whole decades for 30 years. GB/T38950—2020
Note 1: The climatological average is updated every 10 years. The variables in 2000 and before use the average value of 1961-1990 as their climatological average value, the variables between 2001 and 2010 use the average value of 1971-2000 as their climatological average value, the variables between 2011 and 2020 use the average value of 1981-2010 as their climatological average value, and so on. Note 2: Rewrite GB/T33675—2017, definition 2.2. 2.4
summer mean air temperature
summer mean air temperature
average temperature from June to August of the year.
Note: The unit is Celsius (℃).
summer mean air temperature anomaly
summer mean air temperature anomalyThe difference between the summer mean temperature and its climate mean. Note: The unit is Celsius (℃).
cooling summer
Summer with a lower summer mean temperature than its climate mean. Note: According to the occurrence pattern, it can be divided into single-station cool summer, regional cool summer and national cool summer, and according to the occurrence intensity, it can be divided into weak cool summer and strong cool summer (cold summer). coolingsummerindex
Cooling summer index
A quantity reflecting the degree of cool summer.
Note: It includes single-station cool summer index, regional cool summer index and national cool summer index. 1
GB/T389502020
Effective grid effectivegrid
A grid divided by given latitude and longitude grid intervals and containing at least one meteorological observation station that has been continuously conducting temperature observations for more than 30 years. Note: Rewrite GB/T33675-2017, definition 2.7. 3 Level division
Single station cool summer
The single station summer average temperature anomaly (△T) is the single station cool summer index. The single station cool summer index is less than or equal to the single station cool summer threshold value. The single station cool summer is divided into two levels: single station strong cool summer (single station cold summer) and single station weak cool summer. The method for determining the single station cool summer threshold value is shown in Appendix A. The single station cool summer level division and index range are shown in Table 1, and the calculation method of △T and c (standard deviation) in Table 1 is shown in Appendix A. Table 1 Classification of cool summer at a single station and index range Class name
Weak cool summer at a single station
Strong cool summer at a single station (cold summer at a single station)
Regional cool summer
Index range
1.29g
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