Calorie-Count About.com Health
Calories Burned for Activity: Skiing
Cross Country, 4.0-4.9 Mph, Moderate Speed and Effort, General

544 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
2.1 Grande Starbucks Caffe Latte - Made with whole milk 260
0.8 McDonald's Big Mac - With cheese 704
6.9 Glasses of wine (3.5 fl oz) 79
2 Snickers Bar 273
2.6 Cans of Coca-Cola 207
18.1 Carrots 30