Homogenized Surface Pressure (AHCCD)

The Homogenized Surface Pressure data consist of monthly, seasonal and annual means of hourly sea level and station pressure (hectopascals) for 626 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 1953 at some stations to the most recent update in 2014. Data availability over most of the Canadian Arctic is restricted to 1953 to present. The data will continue to be updated every few years (as time permits).

Data and Resources

Additional Info

Field	Value
Last Updated	April 17, 2026, 19:23 (UTC)
Created	April 17, 2026, 19:23 (UTC)
contact_email	ec.ccds.info-info.dscc.ec@canada.ca
contact_person	{"en": "Government of Canada; Environment and Climate Change Canada,1-800-668-6767,ec.enviroinfo.ec@canada.ca", "fr": "Gouvernement du Canada; Environnement et Changement climatique Canada,ec.enviroinfo.ec@canada.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	{"en": ["surface pressure; homogenized; climate; climate change", "Climate", "Climate change", "Weather and Climate", "Provide Climate Information Products and Services", "Expand Scientific Knowledge for Climate Monitoring and Prediction", "National (CA)", "Science and Technology Branch", "Atmospheric Science and Technology", "Unclassified"], "fr": ["pression de surface; homogénéisées; climat; changement climatique", "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)", "Direction générale des sciences et de la technologie", "Sciences et technologie atmosphériques", "Non Classifié"]}
open_canada_subject	["nature_and_environment", "science_and_technology"]
sensitivity_level	unrestricted
title_fr	Pression de surface homogénéisée (DCCAH)
update_frequency	as_needed