Calorie-Count About.com Health
Calories Burned for Activity: Skiing
Cross Country, 2.5 Mph, Slow or Light Effort, Ski Walking

476 calories per hour

Assuming a body weight of: 150 lbs
This is equivalent to eating any of the lines of the following table.

Quantity Description Cals
1.8 Grande Starbucks Caffe Latte - Made with whole milk 260
0.7 McDonald's Big Mac - With cheese 704
6 Glasses of wine (3.5 fl oz) 79
1.7 Snickers Bar 273
2.3 Cans of Coca-Cola 207
15.9 Carrots 30