1901-2010 Maximum/Minimum temperature and Precipitatyion asciigrids 
maxt_grids.zip, 
mint_grids.zip, 
pcp_grids.zip  
tc_grids.zip - 1950-2010

2011-2013 Maximum/Minimum temperature and Precipitation
/climate/nam/historical 
maxt_2011_2013.zip 
mint_2011_2013.zip, 
pcp_2011_2013.zip - processed in 2015

Each year contains 36 monthly asciigrids 10km resolution (300 arcsec) 
Here is an example for year 1910:
Minimum temperature: 
~/1910/mint300_01.asc - ~/1910/mint300_12.asc, starting Jan (_01) to Dec (_12)
Maximum temperature: 
~/1910/maxt300_01.asc - ~/1910/maxt300_12.asc
Precipitation: 
~/1910/pcp300_01.asc - ~/1910/pcp300_12.asc


Units:
Temperature, Celsius degrees
Precipitation, mm

Statistics
Time interval: monthly
Spatial format: grid
Data format: ARC/Info ASCII GRID
Grids domain: 168.0 to 52.00W, 25.0 to 85.0N
Cell size: 0.08333333767
Grids datum: geographic NAD83
Spatial resolution: 300 arc second (~10 km)