Adjusted and Homogenized Canadian Climate Data (AHCCD)

Description

The AHCCD collection includes two types of climate datasets: homogenized and adjusted. The homogenized datasets include monthly or daily surface air temperature, precipitation, and wind speed data for hundreds of climatological locations across Canada. These datasets incorporate a homogenization process, which typically uses statistical methods to detect and remove discontinuities in observed climate records caused by non-climatic influences, such as changes in measurement instruments or monitoring station relocations. In some cases, non-statistical adjustment methods are also applied to correct measured values for known biases caused by instruments or observation techniques (for example, under-catch by certain rain gauges or wind effects). Sometimes, data from multiple nearest stations are combined to extend the length of the record. Together, these methods produce consistent and more reliable Canadian homogenized station data series suitable for detecting and analyzing climate trends and variability. The adjusted datasets are available for precipitation variables only (i.e., rainfall, snowfall, and total precipitation). These datasets do not undergo a homogenization process; instead, they apply corrections for known measurement biases. AHCCD datasets are updated as new adjustment or homogenization methods are developed and/or to include the most recent observations. The homogenized datasets are also used to develop Canadian gridded homogenized datasets (https://catalogue.ec.gc.ca/geonetwork/srv/eng/catalog.search#/metadata/10ff2865-ff61-4f35-af71-3902da51f23a) to provide more continuous spatial representations of climate variables, including in areas where direct observations are unavailable. While homogenized data are the most suitable for studying long-term climate trends, both homogenization and adjustment procedures can introduce their own uncertainties or biases, and the results may change as methods are updated based on new research. It is important for users to carefully read the dataset documentation and understand how the data were processed to ensure their suitability for their research needs and other applications.

Resources

Name Format Description Link
AHCCD Annual WFS https://api.weather.gc.ca/collections/ahccd-annual
AHCCD Annual WFS https://api.weather.gc.ca/collections/ahccd-annual?lang=fr
AHCCD Monthly WFS https://api.weather.gc.ca/collections/ahccd-monthly
AHCCD Monthly WFS https://api.weather.gc.ca/collections/ahccd-monthly?lang=fr
AHCCD Seasonal WFS https://api.weather.gc.ca/collections/ahccd-seasonal
AHCCD Seasonal WFS https://api.weather.gc.ca/collections/ahccd-seasonal?lang=fr
AHCCD Stations WFS https://api.weather.gc.ca/collections/ahccd-stations
AHCCD Stations WFS https://api.weather.gc.ca/collections/ahccd-stations?lang=fr
AHCCD Trends WFS https://api.weather.gc.ca/collections/ahccd-trends
AHCCD Trends WFS https://api.weather.gc.ca/collections/ahccd-trends?lang=fr
Climate Data Extraction Tool HTML https://climate-change.canada.ca/climate-data/#/adjusted-station-data
Climate Data Viewer HTML https://climate-viewer.canada.ca/climate-maps.html
View ECCC Data Mart (English) HTML https://data-donnees.ec.gc.ca/data/climate/scientificknowledge/adjusted-and-homogenized-canadian-climate-data-ahccd/
View ECCC Data Mart (French) HTML https://data-donnees.ec.gc.ca/data/climate/scientificknowledge/adjusted-and-homogenized-canadian-climate-data-ahccd/?lang=fr
View Data Mart HTML https://dd.meteo.gc.ca/climate/ahccd
AHCCD Stations WMS https://geo.weather.gc.ca/geomet-climate?lang=fr&service=WMS&version=1.3.0&request=GetCapabilities&layer=AHCCD.STATIONS
AHCCD Stations WMS https://geo.weather.gc.ca/geomet-climate?service=WMS&version=1.3.0&request=GetCapabilities&layer=AHCCD.STATIONS
Climate Data Viewer HTML https://visualiseur-climatique.canada.ca/cartes-climatiques.html
Data Collection Methodology HTML https://www.canada.ca/en/environment-climate-change/services/climate-change/canadian-centre-climate-services/display-download/technical-documentation-adjusted-climate-data.html
Adjusted and Homogenized Canadian Climate Data (AHCCD) EN HTML https://www.canada.ca/en/environment-climate-change/services/climate-change/science-research-data/climate-trends-variability/adjusted-homogenized-canadian-data.html
Data Collection Methodology HTML https://www.canada.ca/fr/environnement-changement-climatique/services/changements-climatiques/centre-canadien-services-climatiques/afficher-telecharger/documentation-technique-donnees-climatiques-ajustees.htmlD_-_READ_ME_Technical_doc_FR.pdf
Adjusted and Homogenized Canadian Climate Data (AHCCD) FR HTML https://www.canada.ca/fr/environnement-changement-climatique/services/changements-climatiques/recherche-donnees/tendances-variabilite-climatiques/donnees-canadiennes-ajustees-homogeneisees.html

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