Homogenized Surface Pressure (AHCCD)

Homogenized Surface Pressure (AHCCD) is an open dataset from Environment and Climate Change Canada with 23 files (HTML, WFS, WMS, PDF); catalogue record updated 2026-08-04. On CanQuery you can follow the original downloads. Files are available in English and French.

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).

Publisher

Environment and Climate Change Canada

Resources

23

Catalogue metadata updated

2026-08-04