Climatic Research Unit : Data

Paris-London Westerly Index

Monthly and daily SLP for Paris (back to 1670) and London (back to 1692)


Latest update (see below for earlier updates) 24 May 2017:

Cornes et al. (2012a) recovered, quality controlled and homogenized a >300-year daily series of sea-level pressure (SLP) for the city of London (1692-2007). Cornes et al. (2012b) digitized and corrected a number of records to create another very long daily series of SLP for Paris (1670-2007). Both series contain some data gaps, notably 1726-1747 for Paris. Cornes et al. (2012a,b) also assessed the homogeneity of the final series, and data users should refer carefully to these papers when using these data, to take residual concerns into account.

Cornes et al. (2013) used monthly means of the Paris and London SLP series to construct a monthly Paris-London Westerly index from 1692 onwards. This can be used as an estimate of the North Atlantic Oscillation (NAO). See Cornes et al. (2013) for a description of how the Paris-London index is calculated and for a comparison with NAO indices.

When using the Paris-London westerly index, please cite:

When using the Paris daily or monthly SLP series, please cite: When using the London daily or monthly SLP series, please cite: Related references:

Data

FilenameDescription
Paris-London Westerly Index
paris_london_westerly_index.csv Monthly and seasonal data, csv format, missing values are "NA"
paris_london_westerly_index.xlsx Monthly and seasonal data, xlsx format (Microsoft Excel spreadsheet), missing values are "NA"
Paris and London monthly SLP series
paris_monthly.csv Monthly data, csv format, missing values are "NA", units: hPa (millibars)
london_monthly.csv Monthly data, csv format, missing values are "NA", units: hPa (millibars)
Paris and London daily SLP series
paris_MSLP_1670_2007.txt Daily data, plain text format, see README for details of raw and homogenized SLP and quality codes
london_MSLP_1692_2007.txt Daily data, plain text format, see README for details of raw and homogenized SLP and quality codes

Change log


Last updated: May 2017, Tim Osborn & Richard Cornes

These datasets are made available under the Open Database License.
Any rights in individual contents of the datasets are licensed under the
Database Contents License under the conditions of Attribution and Share-Alike.
Please use the attribution Climatic Research Unit, University of East Anglia