AEMET historical data for the Canary Islands

We are pleased to announce that AEMET historical data can now be consulted in the Canary Islands. You can do so through the following link to our web platform: https://sarai-data.igme.es/consultas/consulta-aemet/

Available data

As in the case of the peninsula and the Balearic Islands, the available information has been generated from measurements of accumulated rainfall, daily maximum and minimum temperatures obtained from real stations.

The processed files can be downloaded at the following link: https://www.aemet.es/es/serviciosclimaticos/cambio_climat/datos_diarios?w=1. They are segmented by dates (to facilitate handling) and by the magnitude of interest.

The historical record has been obtained by daily interpolation, according to the procedure described in AEMET Technical Note 24, Peral et al., 2017, and time series have been generated for each of the magnitudes in a 2.5 x 2.5 km grid that covers the surface of the islands, from 1990-01-01 to 2022-12-31.

Figure 1. Nodes of the mesh considered by the AEMET in the interpolation model for the Canary Islands.

Information is not provided for all the AEMET nodes represented in Figure 1, but only for those located on the surface of the islands (or in their vicinity). Figure 2 represents these nodes with measurements.

Figure 2. AEMET nodes for which historical measurements of accumulated precipitation, maximum temperature and minimum daily temperature are available, from 01/01/1990 to 12/31/2022.

Querying

The data query form for the Canary Islands is shared with that of the peninsula and the Balearic Islands.

You can make specific queries or in a rectangular area. In the case of specific queries, the result can be established as that of the measurements of the AEMET node closest to the established coordinates, or interpolated between all AEMET nodes within a circular area, weighing each of them by the inverse of the distance to the point of interest (inverse distance weighted (IDW) interpolation), whose radius (in meters) is chosen by the user around the given coordinate point.

The final result will be, if there are AEMET nodes in the established area, a compressed file in .ZIP format that will contain up to three files:

  • A text file in CSV format with the AEMET data nodes, identified by a unique numerical value (ID), taken into account to establish the history of measurements provided. Figures 3 and 4 represent the AEMET nodes taken into account for the generation of the resulting series in the cases in which the peak of Teide and the city of Gran Canaria are taken as points of interest.
  • Another text file in CSV format with the time series of daily accumulated precipitation, maximum temperature and minimum temperature measurements. Each measurement is identified by the node ID and date.
  • Only in the case of requesting specific coordinates (closest node or interpolated measurement), a plot is included that represents the time series of the measurements in the requested period. As an example, Figure 5 shows the result of the time series for the case of interpolation of AEMET nodes in a 10,000 m buffer around Teide between 01/01/2022 and 12/31/2022.
Figure 3. AEMET nodes considered in the IDW interpolation (weighted by the inverse of the distance) to the peak of Teide. The label of each node shows the distance (in meters) to Teide.
Figure 4. AEMET nodes considered in the IDW interpolation (weighted by the inverse of the distance) for the city of Las Palmas de Gran Canaria. The label of each node shows the distance (in meters) to the city. Note that the nodes on the sea surface have not been taken into account.
Figure 5. AEMET daily time series corresponding to the heavy interpolation by the inverse distance (IDW) of Teide during the year 2022.