Top Screencap: (Path = API's => API Proxies => Weather => Performance)
Bottom Screencap: (Path = Dashboard => Proxy Performance).
Note: In each instance the same date range, API Proxy and environment (test vs prod) is selected.
@webepic , Welcome to Apigee Community. Let me tag our Analytics experts to comment on same.
@webepic if you try with a smaller date range does the error go away ?