Calgary weather

Although Calgary's winters can be uncomfortably cold; warm, dry Chinook winds routinely blow into the city from the Pacific Ocean during the winter months, giving Calgarians a break from the cold. These winds have been known to raise the winter temperature by up to 15°C (27°F) in just a few hours, and may last several days. The chinooks are such a common feature of Calgary's winters that only one month (January 1950) has failed to witness a thaw over more than 100 years of weather observations. More than one half of all winter days see the daily maximum rise above 0°C (32°F). Some mid-winter days even approach 20°C (68°F) on occasion. (source: Wikipedia article on Calgary)

The last couple of days were reasonably warm outside, but the forecast shows a high of -20°C on Friday. Brrr!