weather-wgn.cli

This file contains weather generator data to be used for a SWAT+ setup.

The weather generator file contains weather generator data for any number of stations. For each weather generator station, there will be one line specifying the name of the station, its latitude, longitude, and elevation, and the number of years of maximum monthly 0.5 h rainfall data used to define values for pcp_hhr. There are no headers for this line. These variables are listed in the first table below. The second line for each weather generator station contains the headers for the following 12 lines, which list the weather generator data for each month of the year. An overview of the weather generator data variables is given in the second table below.

A SWAT+ Global Weather Generator Database containing weather generator datasets for almost 180,000 stations across the globe can be downloaded from the SWAT website: https://swat.tamu.edu/data/.

If the user wishes to add a new weather generator station, the use of the WGN Parameters Estimation Tool or the WGN Excel macro is recommended. Both can be downloaded from the SWAT website: https://swat.tamu.edu/software/.

Field	Description	Type	Unit
name	Name of weather generator station	string	n/a
latitude	Latitude of weather generator station	real	Decimal Degrees
longitude	Longitude of weather generator station	real	Decimal Degrees
elevation	Elevation of weather generator station	real	m
yrs_pcp	Number of years of maximum monthly 0.5 h rainfall data used to define values for pcp_hhr	integer	years

Field	Description	Type	Unit	Range
tmp_max_ave	Average or mean daily maximum air temperature for month	real	°C	-30 - 50
tmp_min_ave	Average or mean daily minimum air temperature for month	real	°C	-40 - 40
tmp_max_sd	Standard deviation for daily maximum air temperature in month	real	°C	0.1 - 100
tmp_min_sd	Standard deviation for daily minimum air temperature in month	real	°C	0.1 - 30
pcp_ave	Average or mean total monthly precipitation	real	mm	0 - 600
pcp_sd	Standard deviation for daily precipitation in month	real	mm/day	0.1 - 50
pcp_skew	Skew coefficient for daily precipitation in month	real	mm	-50 - 20
wet_dry	Probability of a wet day following a dry day in the month	real	n/a	0 - 0.95
wet_wet	Probability of a wet day following a wet day in the month	real	n/a	0 - 0.95
pcp_days	Average number of days of precipitation in month	real	n/a	0 - 31
pcp_hhr	Maximum 0.5-hour rainfall in month	real	mm	0 - 125
slr_ave	Average daily solar radiation for month	real	MJ/m^2/day	0 - 750
dew_ave	Average daily dew point temperature for each month (ºC) or relative humidity (fraction)	real	°C or fraction	-50 - 25
wnd_ave	Average daily wind speed in month	real	m/s	0 - 100