The urban-heat-island-effect

https://climateatlas.ca/urban-heat-island-effect 

As several places get hot for the summer, Vancouver is usually stuck with a truncated summer season.

https://www.accuweather.com/en/ca/vancouver/v6c/june-weather/53286 Vancouver only got to have 2 days in June that were at least 30C.

 https://www.accuweather.com/en/weather-forecasts/heat-dome-to-bring-90-to-100-degree-temperatures-to-200-million-in-us-from-late-june-to-early-july/1905879 

https://mynasadata.larc.nasa.gov/basic-page/urban-heat-islands