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Frightfully frigid or wickedly warm? The Weather Network releases Halloween Outlook for Canada

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Dayna Vettese
Meteorologist

Friday, October 25, 2013, 8:18 AM -

We’re approaching the scariest night of the year but what we don’t want to hear is a scary forecast. Looking ahead at our Halloween forecast to see if winter coat wearing princesses and tuque toting superheroes will make an appearance, it looks like fall weather is here to stay through Halloween. The trickiest part of taking a look ahead at Halloween is trying to nail down precipitation. Temperature trends are easier to recognize from a forecast modelling standpoint but small scale items such as showers as well as the timing of weather systems is a more difficult task.

Generally speaking, across Canada, it looks as though a fairly typical mid-fall pattern is in place for Halloween with much of the country experiencing close to seasonal temperatures but with the risk of showers or rain. Below is a graphic of the temperature anomaly as modelled by the Canadian GEM Global model (departure from above or below normal). This map is for a five day time period from October 28 through November 2 (over the Halloween time period) and depicts the pattern change across the country.

British Columbia

There is a potential for rain along the central and north coastal areas of B.C. on Halloween. Normal temperatures are expected for most of the province, with milder than average temperatures in the south. Warmer layers of clothing may be needed as the normal temperatures for October 31 fall from 10-12°C in the afternoon to 5°C overnight.

Prairie Provinces

Temperatures are expected to be seasonal for the region with little chance of precipitation. Due to the general troughing over the Prairies, don’t be surprised to see period showers throughout Halloween. Remember to bundle up before heading out as the average temperature for this time of year falls from 5-8°C in the afternoon to below 0°C overnight. At the end of this article you will find a chart detailing the average daytime highs and lows for Halloween.

Ontario and Quebec

With the pattern change across the country, the storm track is expected to bring the potential for rainmakers across the Great Lakes and Southern Quebec. A storm system could potentially bring heavy precipitation across parts of Ontario and Quebec around Halloween. The Weather Network continues to monitor the timing and exact track of the storm as there is the possibility for the system to pass through the region after Halloween. Northern Quebec should expect below normal temperatures on Halloween, while the rest of Ontario and Quebec should experience near normal temperatures. Models have been trending slower for the system so a pass after Halloween is looking more likely or even it staying south of the Great Lakes. That being said, an unsettled pattern will still be in place across southern Ontario and Quebec so light rain or showers are not out of the question. The two images below indicate the model differences in the placement of the low pressure system on Halloween.

GFS forecast model's solution for system the morning of Halloween on approach to the Great Lakes.

GFS forecast model's solution for system the morning of Halloween on approach to the Great Lakes.

Global forecast model's solution for system on Halloween sliding just south of the Great Lakes.

Global forecast model's solution for system on Halloween sliding just south of the Great Lakes.

Atlantic Canada

After a chilly and unsettled week, temperatures are expected to return to seasonal with fairly dry conditions especially toward eastern Newfoundland. It will likely be windy across Newfoundland and a bit chillier across the northern and western parts of the province. This time of year daytime highs range from about 8-10°C and nighttime lows about 0-2°C.

Overall it’s not an entire spooky forecast. No weather extremes are jumping out at us on Halloween but a system or two to keep an eye on. It doesn’t look likely that any Canadians will see drastically warm temperatures on Halloween so across the country, dress warm under those costumes! Fall is a transitional season will erratic temperature swings and windy conditions so parents are encouraged to check in with The Weather Network online, mobile or TV regularly.

Another important item to keep in mind on Halloween is the sun setting earlier every day! Since the fall equinox, we have been losing daylight every day approaching the shortest day of the year: the winter solstice. In fact, Canadians are losing about 1 second of daylight per day at this time of year. Below you will find a chart including the sunset times for major cities across Canada. A lot of our costumes tend to be dark so ensure that you can be seen while trick-or-treating because likely by the time you head out, the sun will be setting or have already set.

Sunset Times & Historical Halloween Weather

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