Most Helpful Guy
The Okanagan Valley in the south-central part of British Columbia is the closest thing to hot and dry that you'll get in Canada. Classically, the Okanagan Valley roughly encompases the area from Salmon Arm, south through Vernon, Kelowna, Penticton and Osoyoos near the border with the State of Washington in the U. S. But some people also consider towns further west like Kamloops, Ashcroft, Merritt, and Princeton to also be a part of the valley. Either way, that entire region has a very similar climate.
The region is typified by mostly hot and dry days in the summer with lots of year round sun. The region is also designated as a "semi-arid" region and receives very little precipitation year round. The entire area is within only 1-2 inches of precipitation per year from being a true desert climate.
Osoyoos is the "hottest" town in Canada with an average temperature of 31.5C/89F in July. Hotter days are typically in the 35-38C/95-100F range with very dry, arid air. Nights in the Okanagan region are cooler though, even in the summer with average nighttime temperatures in the 10-14C/50-57F range. Winters are milder than most areas in Canada with little to no snow, but they can still receive very cold blasts of Arctic air at times during the winter. But their spring weather typically comes much earlier than the rest of Canada and is warmer as well.
As a side note though, and this will give you an idea of what the general region is like, the Okanagan Valley in particular is typified by few trees overall, dry scrub grass, sage brush, tumbleweeds and even cactus! There are also scorpions and rattlesnakes in the region as well. Not to be feared, but certainly something to keep a mindful eye out for if you are out in nature there.
Here is a random Google 360 view from the bridge in Ashcroft, B. C. to give you an idea of what the general region looks like. This picture was taken in October, so you can imagine it's not much different in the summer:
As a side note though, the only true desert in Canada is in the Acrtic! Most people think deserts are a description of heat, but they aren't; only of the amount of water (precipitation) an area receives per year. A true desert climate receives less than 10 inches of precipitation per year and many areas in the Canadian Arctic get WAY less than that. Some areas receive less than 2 inches of precipitation per year! 😳
Anyway, just curious though, why do you ask? 🙂