Sally bought me a Oregon WMR88 weather station with anemometer, wind direction, outside temperature and rainfall gauges. I’ve finally have it working with the Asus Eee running XP Pro in its 8GB of memory and uploading the data through my WiFi to Wunderground. Giving the lovely chart above.
Next job is to mount the anemometer onto the TV aerial above the house to minimize ground effects. That can wait for the warmer weather though.