Shirakawago

http://shupo.jr-central.co.jp/gifu/modelcourse/shirakawagou_takayama/index.html
http://www.tripadvisor.com.sg/Tourism-g298113-Takayama_Gifu_Prefecture_Chubu-Vacations.html
http://www.japan-guide.com/e/e5952.html

http://shirakawa-go.org/
http://whc.unesco.org/en/list/734
http://www.snowjapan.com/japan-ski-general-information/travel-information
http://www.mustlovejapan.com/subject/shirakawa_go/

weather:

http://www.wunderground.com/history/airport/RJCO/2012/12/27/MonthlyHistory.html?MR=1
http://www.intellicast.com/Local/History.aspx?month=12

Onsen:
http://hidahakusan.jp/spa/index.html

Ski
http://shirakawa-go.org/shirayumi/