When I open https://pirateweather.net it says "An Open Weather Forcast API", I think it's pretty clear if you are using "Pirate Weather" you are really using just Open Weather data source.
As for accuracy, it's mostly about false positives/negatives regarding rain, I don't care whether temperature is right to the degree Celsius, but I care if source says it's gonna rain and then it doesn't and vice versa.
Of course your experience may vary, though not sure why you mention Dark Sky accuracy when we talk here Open Weather used by your site.
As for accuracy, it's mostly about false positives/negatives regarding rain, I don't care whether temperature is right to the degree Celsius, but I care if source says it's gonna rain and then it doesn't and vice versa.
Of course your experience may vary, though not sure why you mention Dark Sky accuracy when we talk here Open Weather used by your site.