Get current weather observations for a German city.
Sourced from the Deutscher Wetterdienst (DWD): temperature, wind,
precipitation and related fields. Read-only, current conditions only (not a
forecast). For warnings use ``get_city_resource(slug,
resource='weather-warnings')``. For a broader question about the city (not
just weather) use ``get_city_overview`` instead, which already includes a
live weather highlight.
Connector