WCAG Accessibility Errors for images

Wanting to use this plugin on a site that will be measured for Accessibility factors but it is throwing errors due to missing “alt” tags on the images used in the plugin. The images are those that indicate ‘sun’, ‘sun+cloud’, ‘moon’ etc.

Could you please add meaningful “alt” tags for the images used in the plugin?
(not title tags, they’re bad for Accessibility).

https://www.ads-software.com/plugins/beautiful-yahoo-weather/