After breaking a new high temperature record Saturday at 24C, Calgary is expecting a run of daytime highs that will keep it below freezing for at least a week.
A change in the weather pattern early in the week will bring in colder Arctic air and the possibility of snow.
The Halloween forecast is expected to be seasonal with a high of 8C and an overnight low of -3C with a chance of rain. But once the mercury drops below 0C Tuesday night, the cold will stay for a while.
Forecast daytime highs after Wednesday are in the -1C to -10C range with overnight temperatures between -7C to -17C.
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The average temperatures in Calgary this time of year are between 9C and -4C, meaning by the end of the week Calgary will be almost 20C below normal.
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Snow is likely Wednesday to Saturday with anywhere between 10 to 30 centimetres possible. Typically, the month of November will see a total of 17 centimeters of snow.
The last time Calgary saw a stretch of days below 0 C was March 2017.
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