anchor.diff:                  maxAirTemperatureInKelvin,mostLikelyLowAirTemperatureInCelsius,mostLikelyLowAirTemperatureInFahrenheit,mostLikelyLowAirTemperatureInKelvin,
                   mostLikelyHighAirTemperatureInCelsius,mostLikelyHighAirTemperatureInFahrenheit,mostLikelyHighAirTemperatureInKelvin,weatherCode,weatherCodeTraditional,
                   averageRelativeHumidityInPercent,averageWindSpeedInMeterPerSecond,averageWindSpeedInKnots,averageWindSpeedInMilesPerHour,averageWindSpeedInBeaufort,
  -                averageWindSpeedInKilometerPerHour
  +                averageWindSpeedInKilometerPerHour,precipitationProbabilityInPercent
   - **PT6H** -    maxWindSpeedInMeterPerSecond,maxWindSpeedInKnots,maxWindSpeedInMilesPerHour,maxWindGustInMeterPerSecond,maxWindGustInKnots,maxWindGustInMilesPerHour
                   minAirTemperatureInCelsius,minAirTemperatureInFahrenheit,minAirTemperatureInKelvin,maxAirTemperatureInCelsius,maxAirTemperatureInFahrenheit,
                   maxAirTemperatureInKelvin,mostLikelyLowAirTemperatureInCelsius,mostLikelyLowAirTemperatureInFahrenheit,mostLikelyLowAirTemperatureInKelvin,
                   mostLikelyHighAirTemperatureInCelsius,mostLikelyHighAirTemperatureInFahrenheit,mostLikelyHighAirTemperatureInKelvin,weatherCode,weatherCodeTraditional,
                   maxPrecipitationAmountInMillimeter,minPrecipitationAmountInMillimeter,precipitationProbabilityMoreOrEqualThan0_1MillimeterInPercent,
  -                precipitationProbabilityMoreThan0_2MillimeterInPercent,precipitationProbabilityMoreThan4_4MillimeterInPercent,precipitationDurationInMinutes,
  -                freshSnowfallInCentimeter,maxFreshSnowfallInCentimeter,effectiveCloudCoverInOcta,averageRelativeHumidityInPercent,averageWindSpeedInMeterPerSecond,
  -                averageWindSpeedInKnots,averageWindSpeedInMilesPerHour,averageWindSpeedInBeaufort,averageWindSpeedInKilometerPerHour
  +                precipitationProbabilityMoreThan0_2MillimeterInPercent,precipitationProbabilityMoreThan4_4MillimeterInPercent,precipitationProbabilityInPercent,
  +                precipitationDurationInMinutes,freshSnowfallInCentimeter,maxFreshSnowfallInCentimeter,effectiveCloudCoverInOcta,averageRelativeHumidityInPercent,
  +                averageWindSpeedInMeterPerSecond,averageWindSpeedInKnots,averageWindSpeedInMilesPerHour,averageWindSpeedInBeaufort,averageWindSpeedInKilometerPerHour
   - **PT12H** -   maxWindSpeedInMeterPerSecond,maxWindSpeedInKnots,maxWindSpeedInMilesPerHour,maxWindGustInMeterPerSecond,maxWindGustInKnots,maxWindGustInMilesPerHour,
                   minAirTemperatureInCelsius,minAirTemperatureInFahrenheit,minAirTemperatureInKelvin,maxAirTemperatureInCelsius,maxAirTemperatureInFahrenheit,
                   maxAirTemperatureInKelvin,mostLikelyLowAirTemperatureInCelsius,mostLikelyLowAirTemperatureInFahrenheit,mostLikelyLowAirTemperatureInKelvin,
                   mostLikelyHighAirTemperatureInCelsius,mostLikelyHighAirTemperatureInFahrenheit,mostLikelyHighAirTemperatureInKelvin,weatherCode,weatherCodeTraditional,
                   convectivePrecipitationProbabilityInPercent,maxPrecipitationAmountInMillimeter,minPrecipitationAmountInMillimeter,precipitationProbabilityMoreOrEqualThan0_1MillimeterInPercent,
                   precipitationProbabilityMoreThan0_2MillimeterInPercent,precipitationProbabilityMoreThan1_4MillimeterInPercent,precipitationProbabilityMoreThan4_4MillimeterInPercent,
  -                precipitationProbabilityMoreThan20MillimeterInPercent,thunderstormProbabilityInPercent,mostSignificantWeatherCode,mostSignificantWeatherCodeTraditional,
  -                effectiveCloudCoverInOcta,freezingRainProbabilityInPercent,groundFrostProbabilityInPercent,hailProbabilityInPercent,snowFallProbabilityInPercent,
  -                minAirTemperatureNearGroundInCelsius,averageRelativeHumidityInPercent,averageWindSpeedInMeterPerSecond,averageWindSpeedInKnots,averageWindSpeedInMilesPerHour,
  -                averageWindSpeedInBeaufort,averageWindSpeedInKilometerPerHour
  +                precipitationProbabilityMoreThan20MillimeterInPercent,precipitationProbabilityInPercent,thunderstormProbabilityInPercent,mostSignificantWeatherCode,
  +                mostSignificantWeatherCodeTraditional,effectiveCloudCoverInOcta,freezingRainProbabilityInPercent,groundFrostProbabilityInPercent,hailProbabilityInPercent,
  +                snowFallProbabilityInPercent,minAirTemperatureNearGroundInCelsius,averageRelativeHumidityInPercent,averageWindSpeedInMeterPerSecond,averageWindSpeedInKnots,
  +                averageWindSpeedInMilesPerHour,averageWindSpeedInBeaufort,averageWindSpeedInKilometerPerHour
   - **PT24H** -   maxWindSpeedInMeterPerSecond,maxWindSpeedInKnots,maxWindSpeedInMilesPerHour,maxWindGustInMeterPerSecond,maxWindGustInKnots,maxWindGustInMilesPerHour,
                   minAirTemperatureInCelsius,minAirTemperatureInFahrenheit,minAirTemperatureInKelvin,maxAirTemperatureInCelsius,maxAirTemperatureInFahrenheit,
                   maxAirTemperatureInKelvin,mostLikelyLowAirTemperatureInCelsius,mostLikelyLowAirTemperatureInFahrenheit,mostLikelyLowAirTemperatureInKelvin,
                   mostLikelyHighAirTemperatureInCelsius,mostLikelyHighAirTemperatureInFahrenheit,mostLikelyHighAirTemperatureInKelvin,maxPrecipitationAmountInMillimeter,
                   minPrecipitationAmountInMillimeter,precipitationProbabilityMoreOrEqualThan0_1MillimeterInPercent,precipitationProbabilityMoreThan0_2MillimeterInPercent,
  -                precipitationProbabilityMoreThan4_4MillimeterInPercent,mostSignificantWeatherCode,mostSignificantWeatherCodeTraditional,evaporationMakkinkInMillimeter,
  -                evaporationPenmanInMillimeter,mostSignificantPrecipitationType,saturationDeficitInHectoPascal,sunshineDurationInMinutes,relativeSunshineDurationInPercent,
  -                globalRadiationInJoulePerSquareCentimeter,averageRelativeHumidityInPercent,averageWindSpeedInMeterPerSecond,averageWindSpeedInKnots,averageWindSpeedInMilesPerHour,
  -                averageWindSpeedInBeaufort,averageWindSpeedInKilometerPerHour
  +                precipitationProbabilityMoreThan4_4MillimeterInPercent,precipitationProbabilityInPercent,mostSignificantWeatherCode,mostSignificantWeatherCodeTraditional,
  +                evaporationMakkinkInMillimeter,evaporationPenmanInMillimeter,mostSignificantPrecipitationType,saturationDeficitInHectoPascal,sunshineDurationInMinutes,
  +                relativeSunshineDurationInPercent,globalRadiationInJoulePerSquareCentimeter,averageRelativeHumidityInPercent,averageWindSpeedInMeterPerSecond,
  +                averageWindSpeedInKnots,averageWindSpeedInMilesPerHour,averageWindSpeedInBeaufort,averageWindSpeedInKilometerPerHour
   
   The "weatherCode" parameter refers to the WMO code table "0 20 003 - Present weather".
   The mostLikelyHighAirTemperature equals maxAirTemperature plus airTemperatureError.
  
positive.code: 			"validPeriod" : "PT0S"
  		}, {
  			"relativeGlobalRadiationInPercent" : 82,
  			"locatedAt" : [-16.78, 32.69],
  			"validUntil" : "2016-12-13T11:00:00Z",
  			"validFrom" : "2016-12-13T10:00:00Z",
  
negative.code: 			"validPeriod" : "PT0S"
  		}, {
  			"relativeGlobalRadiationInPercent" : 77,
  			"precipitationProbabilityInPercent" : 7,
  			"locatedAt" : [-16.78, 32.69],
  			"validUntil" : "2016-12-13T12:00:00Z",
  			"validFrom" : "2016-12-13T11:00:00Z",
  			"validPeriod" : "PT1H"
  		}, {
  			"maxAirTemperatureInFahrenheit" : 66.74,
  			"precipitationProbabilityInPercent" : 7,
  			"weatherCode" : 4,
  			"locatedAt" : [-16.78, 32.69],
  			"validUntil" : "2016-12-13T12:00:00Z",
  			"validFrom" : "2016-12-13T09:00:00Z",
  			"validPeriod" : "PT3H"
  		}, {
  			"maxAirTemperatureInFahrenheit" : 66.74,
  			"precipitationProbabilityInPercent" : 7,
  			"weatherCode" : 3,
  			"locatedAt" : [-16.78, 32.69],
  			"validUntil" : "2016-12-13T12:00:00Z",
  