pywws documentation is now located at This copy is no longer being updated and may be out of date.



Python software for USB Wireless WeatherStations.

pywws is a collection of Python modules to read, store and process data from popular USB wireless weather stations such as Elecsa AstroTouch 6975, Watson W-8681, WH-1080PC, WH1080, WH1081, WH3080 etc. I assume any model that is supplied with the EasyWeather Windows software is compatible, but cannot guarantee this.

The software has been developed to run in a low power, low memory environment such as a router or Raspberry Pi. It can be used to create graphs and web pages showing recent weather readings, typically updated every hour. It can also send “live” data to services such as Weather Underground and post messages to Twitter.

The development version of pywws is hosted on GitHub.
“Snapshot” releases of pywws are available from the Python Package Index (PyPI).
Documentation is hosted on Read the Docs.
Documentation is available in the following languages (non-English versions may not be complete or up to date):

I have written this software to meet my needs, but have tried to make it adaptable to other people’s requirements. You may want to edit some or all of the modules, or write some new ones, to get it to do exactly what you want. One of the reasons for using Python is that it makes such alterations so easy. Don’t be afraid, just jump in and have a go.


The software you’ll need to run pywws depends on what you plan to do with it. You’ll need Python 2.5 or later – Python 3 is partially supported, some functionality depends on libraries that have not yet been ported to Python 3.

For more detail, see Dependencies.

Installing and upgrading pywws

pywws can be installed directly from the Python Package Index (PyPI) using the pip command. See How to get started with pywws for full instructions.

Some new versions of pywws change what’s stored in the hourly, daily or monthly summary data files. These new versions are incompatible with processed data from earlier versions. The pywws.Reprocess script regenerates all the summary data. It should be run after any major upgrade.


I would not have been able to get any information from the weather station without access to the source of Michael Pendec’s “wwsr” program. I am also indebted to Dave Wells for decoding the weather station’s “fixed block” data.

Last of all, a big thank you to all the pywws users who have helped with questions and suggestions, and especially to those who have translated pywws and its documentation into other languages.


pywws - Python software for USB Wireless WeatherStations.
Copyright (C) 2008-15 pywws contributors

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Comments or questions? Please subscribe to the pywws mailing list and let us know.