process_weather: Process weather data for calcs
In WDNR-Water-Use/CSLSchem: CSLS Water Chemistry Analysis

Description Usage Arguments Details Value

Processes CSLS weather data for water/solute balance calculations. Transforms data from CSLSdata package, calculates lake evaporation using CSLSevap package, and summarizes at a daily or monthly time step for the desired time period.

1	process_weather(start_date, end_date, dt = "day")

`start_date`	start date of analysis period (POSIX).
`end_date`	end date of analysis period (POSIX).
`dt`	time step at which to summarize data. Defaults to "day" for daily time step, can also be "month" for monthly time step.

If using with non-CSLS data, will need an alternate way to get weather data (including lake evaporation) into the format outputted by this function.

df, a data frame with the following columns:

`lake`	name of lake, i.e., "Pleasant", "Long", and "Plainfield"
`date`	date of observation (POSIX). If monthly time step, monthly summary is assigned to first day of the month
`day`	day of year of observation (1-366)
`P_mm`	precipitation (mm)
`E_mm`	lake evaporation (mm)
`atmp_C`	mean air temperature (deg C)
`RH_pct`	mean relative humidity (percent)
`irr_factor`	irradiance factor, fraction from 0-1 representing relative intensity of solar radiation based on day of year. For use in dynamic lake model for some solute reactions