UA39_44


UA39_44 is a data set of historical upper-level data obtained from radio sonde and air craft observations in the Northern Hemisphere from 1939-1944. The data set is available for non-profit purposes (reasearch, academic, class room), provided that

- the source is acknowledged and a reference is given to Brönnimann, S. (2003a or b)

- the following line is added to any publications: "Based on information supplied by the UK Met Office, the Deutscher Wetterdienst, the Swedish Meteorological and Hydrological Institute, and data extracted from the Monthly Weather Review."

- you have read this disclaimer

Please read the paper and the report carefully. The data set might not be suitable for the needs of your project. The data have been used to reconstruct monthly upper-level fields for the extratropical Northern Hemisphere. The reconstructed fields and error measures are also available below and can be used, provided that a reference is given to Brönnimann and Luterbacher (2004), as given below. If you donwload any data from this site, please send me an email.



Brönnimann, S. (2003a) A historical upper air data set for the 1939-1944 period. International Journal of Climatology, 23, 769-791.

Brönnimann, S. (2003b) Description of the 1939-1944 upper air data set (UA39_44) Version 1.0, University of Arizona, Tucson. 40 p. (pdf, 6 MB)


Minor updates and supplementations:

Brönnimann, S. (2004) Version 1.1 of the 1939-1944 upper air data set (UA39_44), University of Arizona, Tucson. 12 p. (pdf, 0.15 MB)


Reconstructed fields:

Brönnimann, S. and J. Luterbacher (2004) Reconstructing Northern Hemisphere upper level fields during World War II. Climate Dynamics, 22, 499-510, DOI: 10.1007/s00382-004-0391-3.


Further documents:

UA39_44 Stationlist (pdf)

UA39_44 Filedescription (pdf)

Link to UA39_44 Version 1.0 data (WinZip archive, 7.5 MB)

Link to UA39_44 Version 1.1 data (WinZip archive, 7.5 MB)

Link to reconstructed fields


Last modified 13 May 2004

broenn@giub.unibe.ch