If its 0 fahrenheit/celsius, either it is that temperature in that city as reported by OpenWeatherMap or, more likely then not its because the plugin couldn’t get a response from the server… The free API has been down for about 2 days now, even though OWM Support swears it is up and running. Though I have a lot of people who can confirm they haven’t been able to call the Weather API or get a weather report in two days… So its on their end. Just wait for a while and let it be resolved by itself.
Yep, like yoshiandmario1 said, OWM API has troubles.
More info on there Twitter and Facebook account.
