Previously, we shared with you the daily average temperature data specific to weather stations from 1929 to 2022 around the world (you can check the previous article for details), and the daily maximum temperature data (you can check the previous article for details)! After getting the data, some friends also asked us if we have the data of the minimum temperature!
This time we bring the daily minimum temperature data specific to meteorological observation stations around the world from 1929 to 2022! The data is still from the National Center for Environmental Information (NCEI).
The raw data of the daily average temperature downloaded from the NECI official website is in degrees Fahrenheit, and the data format is csv. For the convenience of everyone, we have processed the original data, converted the unit to Celsius, converted the format to vector format (shp), and the data coordinate system is GCS_WGS_1984. Taking 2022 as an example, there are 12,319 meteorological observation stations in the world. The specific data The processing method will be described in detail below!
The following is a detailed introduction to the data:
01Data preview
Since it is the daily minimum temperature data and there are more than 94 years, the number of data items is very large, and it is difficult to save all the years in a shp file. We save the data of each year as a shp file, there are 94 years in total, that is, there are 94 shp files! Each file contains the daily minimum temperature for all weather observation stations around the world for that year. Let's take the daily minimum temperature data of meteorological observation stations in 2022 as an example to preview:
The data fields include the number of the meteorological observation station (STATION) , the name of the meteorological observation station (NAME), latitude (LATITUDE) and longitude (LONGITUDE) , and daily minimum temperature data (eg 2022-01-01) .
02Data source
Data from the National Center for Environmental Information (NCEI) under the National Oceanic and Atmospheric Administration (NOAA), available at: https://www.ncei.noaa.gov/data/global-summary-of-the-day /archive/, including the meteorological data from 1929 to 2022, you can go to this website to download the original data yourself!
03Data Processing Instructions
1. Merge processing:
The original csv data downloaded from the NCEI website, each 1 csv is all the temperature of a specific site within a year, recorded by day, but not all 365 days, some more than 300 days, some only a dozen days. We merged the daily minimum temperature data of all meteorological observation stations involved in each year according to the year, and finally got 94 year-named shp files.
2. Unit conversion:
To convert Fahrenheit to Celsius, the data processing formula is Celsius = (Fahrenheit - 32°F) ÷ 1.8 for conversion.
3. Null value processing:
The null values in the original csv data are filled with floating-point numbers such as 9999.9 or 999.9. During processing, we filter out these floating-point numbers, and the processed Shp corresponds to the null value.
4. Description of the number of stations:
The number of stations varies from year to year. Basically, the newer the year, the more global weather stations there are. There are 12,319 in 2022, and there are fewer weather stations in earlier years.
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