wundergroundPws Automation

dear all
Can you help me?
i have an automation with if external degree above 18 open 50%.
But from wundergroundPws (my external sensor) see this wrong:
In ‘numeric_state’: In ‘numeric_state’ condition: entity sensor.itrada25_temperature state ‘Data provided by the WUnderground weather service’ cannot be processed as a number

But I see a temperature from this sensor…