Down by the riverside ... it's colder!

Cold, bright weather at Britannia Point on the Ottawa

During the current cold snap, people have been noticing and commenting upon the difference in temperature measurements between the temperature readings at Ottawa International Airport (formerly "Uplands"––374 ft ASL) and at Gatineau (211 ft ASL), hardly any distance further north, but closer to the Ottawa River. Here's an article from the Ottawa Citizen that explains the phenomenon.

Cold air is heavy and it drains. [...] That’s why White River was for years considered the coldest place in Canada. It’s in what we call a frost hollow.

Actually the temperature in White River today is +1ºC, whereas in Gatineau it's -12º (feels like -19º).

Ontario weather is variable.