As you are going from Whistler Village in the valley to the PEAK 2 PEAK Gondola in the alpine, weather conditions and temperatures can change. As a rule of thumb it is usually 5 to 10 degrees (Celcius) cooler on the mountain than in the village.
Dress comfortably for the mountains - layers are recommended so you can adjust accordingly. If you plan to hike, other gear is recommended such as comfortable, sturdy shoes and water.
Please note that to access the PEAK 2 PEAK Gondola in wintertime, you will need to walk through the snow - dress warmly and wear waterproof boots for comfort. There are restaurants, shops and washroom facilities on both mountains.