In easyweather you define the most used theme, in your case “dark”. If a visitor changes that to light, that temporary change is stored in a cookie in his/her browser. Some users set the use of cookies in their browser to false, so the temporary setting is not kept between refreshes
2. If I make my link (http://www.weather911.net/pwsWD/?theme=dark) public, how do I remove the “Home” and “Menu” buttons at the top left?You can not do that with a setting. Only by changing the scripts themselves. Be aware that all other links to menu items are lost then also
3. Can I use a tablet to display the above link and have it display in landscape mode, similar to desktop appearance?It should always display exactly the same way as on a desktop when you hold the tablet in landscape mode. It can switch to “phone mode” when holding the tablet vertically. There is a minimum width for phone-type-devices, below that width only the important blocks are shown one below each other.
With “historical data.” do you mean: the graphs? They get their data either from your own WU data. Or from the data-table on your webserver.
Using the webserver to store historical data correctly, you should also run the cron-jobs: every 10 minutes plus just before and just after midnight.
Storing the information in the database-table and generating your own daily, monthly and yearly .csv files is described in:
Wim
P.S. Now your scripts seems to work, you should install the updates also.
http://wd34.weather-template.com/ ==> Downloads ==> Third row Updated scripts up to 2019-01-19