Viewer for GHCN V4, with search and active graph
Here is an active viewer for historic GHCN V4 station data (27380 stations). Details are in a post here. The key viewer is an active graph, similar to the one for temperature indices here. In the text box within the pink rectangle, you can type part or all of a station name (use underscores for spaces), and click "Search". A list of stations found will appear, with radio buttons. The display also shows duration of data and the GHCN code for the station. Select one. Plots will appear, and the yellow table of months will have checkboxes with ticks. You can change which months, using adjusted or unadjusted data, will be shown.
The plot itself can be varied with mouse dragging. If you drag below the x axis, that axis will stretch or shrink, and similarly with y. At any stage you can click the data button to bring up a tab with the data shown on the screen tabulated. There is a legend which is also draggable, and you can put it on the plot for a screenshot. You can click on the color buttons to vary the colors. It will select randomly from a palette of 64, so keep clicking until it suits.
An added feature is the button,next to Search, labelled "Show GHCN plots". This produces in a new tab a GHCN plot of the unadjusted data for that station, with trend.