NOAA ERSSTv4 (in situ only)
X axis: whole world in 180 2.00° steps, first point at 0.00° E, last point at 358.00° E
Y axis: regular grid with 89 2.00° steps, first point at 88.00° S, last point at 88.00° N
Z at 0.00 meters
Monthly data available from Jan1854 to Mar2019 (1983 months) , time refers to the center time of the day

Variable sst (Extended reconstructed sea surface temperature) in degree_C
Full metadata.

Get grid points, average area or generate subset

Mask:	no mask mask1.txt mask5.txt   add a mask to the list
Latitude:	°N - °N
Longitude:	°E - °E
Boundaries:	halfway grid points interpolated
Make:	average max min set of grid points subset of the field
Demand at least:	% valid points in this region
Units:	convert to Celsius leave in degree_C

Create a field with lower time resolution

New time scale:	annual (Jul-Jun) annual (Jan-Dec) biannual seasonal
New variable:	mean sd sum sum above sum below number min time of min max time of max first time last time of SST
Threshold:	no cut less than greater than degree_C percentile normal 1971-2000
Minimum:	% valid data
First apply:	-month running mean
Missing data:	ignore, climatology, trend, persistence.

Create a field with lower spatial resolution

Average over blocks of longitude and latitude grid cells

Construct a statistical forecast model from this field

Compute expected number of Atlantic hurricanes

Please consider downloading this field from the authoritative site.
If you really want to get it here, ERSST v4 SST is available as a netcdf file (size 125.333 MB).