Extract GHCN Daily Station Data

Description

Daily minimum temperature, maximum temperature, precipitation, snowfall, and snow depth data can be downloaded from the Global Historical Climatology Network-Daily (GHCN-Daily) website, but these data are in a different format than the one used by HOB Tools. This tool transforms these data into the format used by HOB Tools (i.e., Year / Month / Day / Temp / Precip / Snow / Snow Depth, where each "/" is a tab).

Input

Input File
Select the input file by clicking on "Browse" and navigating to the proper file.

Input Data Format
Data downloaded from the GHCN-Daily website will have each station in a separate file (*.dly) denoted by a station number. The station name associated with each station number is stored in the ghcnd-stations.txt file on the website, which allows the user to extract the necessary file for input into HOB Tools as is for processing. See the readme.txt file at the website for additional details.

Start Row
This input is the row number where the main data to be processed begin in the dataset. The start row will be 1 in all cases unless the user has added additional header information to the downloaded dataset. An example of how row numbers are entered is shown in Figure 2 located in the Running HOB Tools topic.

Extraction Options

The data downloaded from the GHCN-Daily system have temperature in °C and the precipitation in mm. This tool will output the data in the same units by default, but this can be changed in this input section of the tool. Users can also have the tool output the mean temperature data instead of the minimum and maximum temperature data by selecting "Mean" under "Temperature Output and Units".

Output

Output File
Select the file where the new data will be stored.

Output File Header
Information entered here will be output in the first line of the output file.