I think the issue is with your $SITE['WCAPIkey'] in Settings.php -- It ends in a space, and looks like the old $SITE['WUAPIkey'] entry for the defunct WU-forecast.php script. Are you using a NEW API key from WeatherUnderground? If not, acquire a new key and place it in the $SITE['WCAPIkey'] entry in Settings.php to get the WXDailyHistory.php to work.
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I think I have cleared up the WCAPIKey issue. Navigate to:
view-source:https://www.hburg-wx.net/WXDailyHistory.php?&year=2019&debug=y, this is what I get now.
<!-- curl fetching '
https://api.weather.com/v2/pws/history/all?stationId=KVAHARRI7&format=json&units=E&date=20190529&apiKey=xxxxxxxxxxxxxxxx' -->
<!-- HTTP stats: RC=400 dest=104.90.85.30 port=443 (from sce=144.217.72.101)
Times: dns=0.000 conn=0.013 pxfer=0.046 get=0.049 total=0.095 secs -->
<!-- headers returned:
HTTP/2 400
access-control-allow-origin: *
content-language: en-US
content-type: application/json; charset=UTF-8
x-region: us-east-1
x-trace-token: 6665ba73-aebc-42bf-a5ba-73aebc42bf2f
content-length: 188
expires: Wed, 29 May 2019 19:24:43 GMT
cache-control: max-age=0, no-cache, no-store
pragma: no-cache
date: Wed, 29 May 2019 19:24:43 GMT
-->
And I still see: "Sorry... the WU data for this date is not currently available. Please try again later." when I try to view the results.