What's great
I have to agree with those who say it would be great, if it actually worked. But it has a fatal flaw that makes it useless. It can't find most locations. It can't even find the capital city in the state I live in.
If it's gonna be useful, it needs to have more ways to specify a location that simply entering the name of a city.
What needs improvement
It needs to actually be able to find the city I want weather data for. Right now, it can't. And that is true even for major cities / state capitals.
vs Alternatives
I didn't. It can't find any city that is anywhere near me.
Can you adjust update times or refresh frequency?
Yes. I can set how often I want my calendar to update and pull the latest weather data.
Are there issues with the OpenWeatherMap data source?
Yes. It is often somewhat inaccurate even when it does get the right location. But right now, this application can't find most locations.
Does it work reliably on mobile calendar apps?
I haven't tested it, but it should.