There are four ways to select a set of stations from a dataset (selected above). The first non-blank field is used.

• By name: all stations with the substring given are selected. Note that almost all stations names have been reduced to plain latin characters without accents, so searching for stations outside the UK or US somtimes requires some phantasy.
• By approximate coordinates: N stations (default 10) around a point on the map are returned. Please enter degrees west or south as negative numbers, if necessary with a decimal fraction (minutes and seconds are not recognised). Alternatively you can obtain the coordinates by clicking on a world map (follow the link).
• All stations in a rectangle, again use negative numbers for degrees west or south.
• A list of station numbers. This can be useful if you want to exclude some stations that are included in the rectangle above.

The set can be restricted by the number of years with data, the altitude, and the distance between stations .

Once a set of stations has been selected you can select a single station or operate on the whole set.