Homogenized Surface Air Temperature (AHCCD)

The Homogenized Surface Air Temperature data consist of monthly, seasonal and annual means of homogenized daily maximum, minimum and mean surface air temperatures (degrees Celsius) for 338 locations in Canada. Homogenized climate data incorporate adjustments (derived from statistical procedures) to the original station data to account for discontinuities from non-climatic factors, such as instrument changes or station relocation. The time periods of the data vary by location, with the oldest data available from the early 1880s at some stations to the most recent update in 2017. Observations at co-located sites were sometimes joined in order to create longer time series. Data availability over most of the Canadian Arctic is restricted to the mid-1940s to present. The data will continue to be updated every year.

Data and Resources

Additional Info

Field	Value
Last Updated	April 17, 2026, 22:07 (UTC)
Created	April 17, 2026, 22:07 (UTC)
contact_email	ec.ccds.info-info.dscc.ec@canada.ca
contact_person	{"fr": "Gouvernement du Canada; Environnement et Changement climatique Canada,enviroinfo@ec.gc.ca", "en": "Government of Canada; Environment and Climate Change Canada,819-997-2800,enviroinfo@ec.gc.ca"}
criticality_level	[]
data_dictionary	["climatology_meterology_atmosphere"]
geographic_scope	[]
open_canada_collection	fgp
open_canada_date_published	2018-09-06 00:00:00
open_canada_keywords	{"fr": ["température; homogénéisées; climat; changement climatique", "Temps et climat", "Fournir des services et des produits d'information sur le climat", "Approfondir les connaissances scientifiques et formuler de nouvelles méthodes de recherche le climat et le changement climatique", "National (CA)", "Climat", "Changement climatique"], "en": ["temperature; homogenized; climate; climate change", "Weather and Climate", "Provide Climate Information Products and Services", "Expand Scientific Knowledge for Climate Monitoring and Prediction", "National (CA)", "Climate", "Climate change"]}
open_canada_subject	["nature_and_environment", "science_and_technology"]
sensitivity_level	unrestricted
title_fr	Température de l’air de surface homogénéisée (DCCAH)
update_frequency	as_needed