Hi! I see your Weather app isn’t loading on your Mac with OS X 10.15.7. Let’s get this sorted out together. To start, can you tell me a bit more about what happens when you try to open the app? Does it freeze, crash, or just stay blank? Also, have you noticed if your internet connection is working fine in other apps?

While I wait for those details, here’s a straightforward list of things we can try to fix the Weather app:

1. Check your internet connection: Make sure your Mac is connected to Wi-Fi or Ethernet and the connection is stable. The Weather app relies on the internet to fetch data.

2. Quit and reopen the Weather app:
- Click on the Weather app.
- From the menu bar, click "Weather" > "Quit Weather" or press Command (⌘) + Q.
- Then reopen it to see if it loads.

3. Restart your Mac: Sometimes a simple restart can clear temporary glitches.

4. Check Location Services: Weather apps often use your location to give accurate details.
- Go to Apple menu > System Preferences > Security & Privacy > Privacy tab.
- Select "Location Services" and ensure it's enabled for the Weather app.

5. Update macOS: Since you’re on 10.15.7 (Catalina), verify if any system updates are available, as these sometimes include app fixes.
- Apple menu > System Preferences > Software Update.

6. Clear any cached data: Unfortunately, Mac’s Weather app doesn’t have a direct cache clear option, but restarting the app or your Mac helps with this.

If you tried any of those steps already or if you have more info about the issue, please let me know and I can guide you with the next steps.

Are you able to share those details? That way I can pinpoint the best solution for you.