anchor.diff:                  "dewPointTemperatureInKelvin": 276.15,
                   "relativeHumidityInPercent": 97,
                   "effectiveCloudCoverInOcta": 5,
  +                "totalCloudCoverInOcta": 6,
                   "visibilityInMeter": 2000,
                   "visibilityInKilometer": 2,
                   "visibilityInNauticalMile": 1.0799999,
  
positive.code: - **PT0S** -    airTemperatureInCelsius, airTemperatureInFahrenheit, airTemperatureInKelvin, feelsLikeTemperatureInCelsius, feelsLikeTemperatureInFahrenheit,
                  feelsLikeTemperatureInKelvin, airPressureInHectoPascal, windSpeedInMeterPerSecond, windSpeedInKilometerPerHour, windSpeedInMilesPerHour,
                  windSpeedInBeaufort, windSpeedInKnots, windDirectionInDegree, dewPointTemperatureInCelsius, dewPointTemperatureInFahrenheit, dewPointTemperatureInKelvin,
                  relativeHumidityInPercent, effectiveCloudCoverInOcta, visibilityInMeter, visibilityInKilometer, visibilityInNauticalMile,visibilityInStatuteMile, weatherCode, weatherCodeTraditional
  - **PT1H** -    windGustInMeterPerSecond, windGustInKilometerPerHour, windGustInMilesPerHour, windGustInBeaufort, windGustInKnots, precipitationAmountInMillimeter, precipitationAmountInInch
  - **PT3H** -    pressureTendencyCode, pressureChangeInHectoPascal
  - **PT12H** -   temperatureMaxInCelsius, temperatureMaxInFahrenheit, temperatureMaxInKelvin, temperatureMinInCelsius, temperatureMinInFahrenheit, temperatureMinInKelvin
  
negative.code:                 "dewPointTemperatureInKelvin": 276.15,
                  "relativeHumidityInPercent": 97,
                  "effectiveCloudCoverInOcta": 5,
                  "totalCloudCoverInOcta": 6,
                  "visibilityInMeter": 2000.0,
                  "visibilityInKilometer": 2.0,
                  "visibilityInNauticalMile": 1.0799999,
  