Arctic SDI catalogue
Adjusted and Homogenized Canadian Climate Data (AHCCD)
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.
Simple
- Date ( RI_367 )
- 2000-01-01
- Date ( RI_366 )
- 2000-01-01
- Status
- completed; complété RI_593
- Maintenance and update frequency
- asNeeded; auBesoin RI_540
- Keywords ( RI_528 )
-
- surface air temperature, precipitation, surface pressure, surface wind speed
- ECCC Information Category EN ECCC Information Category FR ( RI_528 )
-
- Weather and Climate
- Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )
-
- Climate change
- Climate
- Business Functions Fonctions de l'entreprise ( RI_528 )
-
- Expand Scientific Knowledge for Climate Monitoring and Prediction
- Provide Climate Information Products and Services
- Geography Portée Géographique ( Place )
-
- National (CA)
- external.theme.EC_Branch local.theme.external.theme.EC_Branch ( RI_528 )
-
- Science and Technology Branch
- external.theme.EC_Directorate local.theme.external.theme.EC_Directorate ( RI_528 )
-
- Atmospheric Science and Technology
- external.theme.GC_Security_Level local.theme.external.theme.GC_Security_Level ( RI_528 )
-
- Unclassified
- Use limitation
- Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)
- Access constraints
- license; licence RI_606
- Use constraints
- license; licence RI_606
- Spatial representation type
- textTable; texteTable RI_637
- Metadata language
- eng; CAN
- Character set
- utf8; utf8 RI_458
- Topic category
-
- Climatology, meteorology, atmosphere
- Begin date
- 1900-01-01
- End date
- 2025-12-31
))
- Reference system identifier
- / EPSG:4326 /
- Distribution format
-
-
TXT
(
2
)
-
TXT
(
2
)
Distributor
http://ec.gc.ca
- Fees
- None
- OnLine resource
-
Adjusted and Homogenized Canadian Climate Data (AHCCD) EN
(
HTTPS
)
Dataset;HTML;eng
- OnLine resource
-
AHCCD Monthly
(
HTTPS
)
Web Service;WFS;fra
- OnLine resource
-
AHCCD Trends
(
HTTPS
)
Web Service;WFS;fra
- OnLine resource
-
AHCCD Seasonal
(
HTTPS
)
Web Service;WFS;fra
- OnLine resource
-
AHCCD Stations
(
HTTPS
)
Web Service;WFS;fra
- OnLine resource
-
AHCCD Annual
(
HTTPS
)
Web Service;WFS;fra
- OnLine resource
-
Adjusted and Homogenized Canadian Climate Data (AHCCD) FR
(
HTTPS
)
Dataset;HTML;fra
- OnLine resource
-
View Data Mart
(
HTTPS
)
Dataset;HTML;eng,fra
- OnLine resource
-
Climate Data Viewer
(
HTTPS
)
Application;HTML;eng
- OnLine resource
-
Climate Data Viewer
(
HTTPS
)
Application;HTML;fra
- OnLine resource
-
AHCCD Stations
(
HTTPS
)
Web Service;WMS;eng
- OnLine resource
-
AHCCD Stations
(
HTTPS
)
Web Service;WMS;fra
- OnLine resource
-
AHCCD Stations
(
HTTPS
)
Web Service;WFS;eng
- OnLine resource
-
AHCCD Annual
(
HTTPS
)
Web Service;WFS;eng
- OnLine resource
-
AHCCD Seasonal
(
HTTPS
)
Web Service;WFS;eng
- OnLine resource
-
AHCCD Trends
(
HTTPS
)
Web Service;WFS;eng
- OnLine resource
-
AHCCD Monthly
(
HTTPS
)
Web Service;WFS;eng
- OnLine resource
-
Climate Data Extraction Tool
(
HTTPS
)
Application;HTML;eng,fra
- OnLine resource
-
View ECCC Data Mart (English)
(
HTTPS
)
Web Service;HTML;eng
- OnLine resource
-
View ECCC Data Mart (French)
(
HTTPS
)
Web Service;HTML;fra
- OnLine resource
-
Data Collection Methodology
(
HTTPS
)
Supporting Document;HTML;eng
- OnLine resource
-
Data Collection Methodology
(
HTTPS
)
Supporting Document;HTML;fra
- File identifier
- 9c4ebc00-3ea4-4fe0-8bf2-66cfe1cddd1d XML
- Metadata language
- eng; CAN
- Character set
- utf8; utf8 RI_458
- Hierarchy level
- series; série RI_623
- Date stamp
- 2026-07-29T20:10:39.755677Z
- Metadata standard name
- North American Profile of ISO 19115:2003 - Geographic information - Metadata
- Metadata standard version
- Enviroment Canada - Version 1
http://ec.gc.ca
Overviews
Spatial extent
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