My precipitation and temperature data is from 1/1/1965 upto 12/31/1982. When I click Setup SWAT Run after choosing simulation period that ends with 31st, it gives me the error above except for the year 1982. (e.g. 1/1/1965 to 12/31/1974 or 1/1/1965 to 12/31/1980). But when I run upto a date less than 31st of the month of any year, it runs successfully. e,g. 1/1/1965 to 12/30/1974.

Surprisingly a first run with 1/1/1965 to 12/30/1974 and then followed by 1/1/1965 to 12/31/1974 will also work well.

I need some advise.

Thanks

Sadat