What's the climate like in London, Canada?

This was found on Wikipedia. The average low temperature in August is 13.7 degrees, and the average high temperature is 25.2 degrees. In September, the average low temperature was 9.6 degrees and the average high temperature was 20.9 degrees. Compared with Qingdao, the temperature is low and the temperature difference between day and night is large. It may be a little cold to wear short sleeves and skirts.