Problem 1
Change the starting and ending years in the expert mode window, press OK and then
to 'Data files' to download the data.
http://iridl.ldeo.columbia.edu/expert/SOURCES/.KAPLAN/.EXTENDED/.v2/.ssta/T/%28Jan%201900%29%28Dec%202011%29RANGE/T/12/boxAverage/T/12/STEP/

These commands perform the annual average of SST anomalies at each grid point for
the desired period.
Repeat this with different periods to get data for problem 1(iv)

#### Problem 2
This creates Dec-Mar average SST anomalies at each grid point for the period Dec 1900 - Mar 2012
also precip at 81 divisions in Western US, useful for problem 2
http://iridl.ldeo.columbia.edu/expert/SOURCES/.KAPLAN/.EXTENDED/.v2/.ssta/T/%28Dec%201901%29%28Mar%202012%29RANGE/T/4/boxAverage/T/12/STEP/

http://iridl.ldeo.columbia.edu/expert/SOURCES/.NOAA/.NCDC/.CIRS/.ClimateDivision/.pcp/T/%28Dec%201900%29%28Dec%202012%29RANGE/T/4/boxAverage/T/12/STEP/IDIV/201/202/203/204/205/206/207/401/402/403/404/405/406/407/502/504/505/1001/1002/1003/1004/1005/1006/1007/1008/1009/1010/2401/2402/2403/2404/2405/2406/2407/2601/2602/2603/2604/2901/2902/2904/2905/2906/2907/2908/3501/3502/3503/3504/3505/3506/3507/3508/3509/4201/4202/4203/4204/4205/4206/4207/4501/4502/4503/4504/4505/4506/4507/4508/4509/4510/4801/4802/4803/4804/4805/4806/4807/4808/4809/4810/VALUES/

Problem 4/5
Dec 1900 - Mar 2012 (winter average) - AZ precipitation (at 7 divisions in AZ)
http://iridl.ldeo.columbia.edu/expert/SOURCES/.NOAA/.NCDC/.CIRS/.ClimateDivision/.pcp/T/%28Dec%201900%29%28Dec%202012%29RANGE/T/4/boxAverage/T/12/STEP/IDIV/201/207/RANGE/data.ch

(7 rows, each contains as many number of years)