UKCP09: 25km Gridded Long-Term Average Sea-Level Pressure for the UK

UKCP09 25 km gridded data provides monthly, seasonal, and annual long-term averages for mean sea-level pressure. The data covers the 1961-1990 climate baseline period, with each 25 x 25 km grid box value representing an average of underlying 5 x 5 km cells. This dataset was created with financial support from the UK's Department for Environment, Food and Rural Affairs (Defra) and is promoted by the UK Climate Impacts Programme.

Use Cases

• Analyzing seasonal pressure patterns across the UK based on the provided monthly and seasonal averages.
• Validating regional climate models using the 1961-1990 long-term average baseline data.
• Studying atmospheric circulation over the UK based on gridded sea-level pressure data.
• Creating climate baseline maps for impact assessments based on the 25km resolution grid.

Strengths

• Provides a consistent 30-year climate baseline (1961-1990) for analysis.
• Data is available at multiple temporal aggregations: 12 monthly files, 4 seasonal files, and 1 annual file.
• Grid values are derived from a higher-resolution 5km model, likely improving representativeness.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Data may reflect temporal bias inherent to the specific 1961-1990 baseline period.

Provenance

Source

Met Office (UK), UK Climate Impacts Programme (UKCIP).

Collection Method

Derived from the HadRM3 regional climate model outputs, averaged to a 25km grid.

Time Range

1961-1990

Freshness

Last updated 2026-07-08 13:31:36.563614; freshness should be verified.

Geography

United Kingdom, gridded coverage.