anchor.diff:  			"validPeriod" : "PT0S"
   		}, {
   			"relativeGlobalRadiationInPercent" : 77,
  -			"precipitationProbabilityInPercent" : 7,
   			"locatedAt" : [-16.78, 32.69],
   			"validUntil" : "2016-12-13T12:00:00Z",
   			"validFrom" : "2016-12-13T11:00:00Z",
  
positive.code: + The mostLikelyLowAirTemperature equals minAirTemperature minus airTemperatureError.
  + min/maxAirTemperature
      + The min/maxAirTemperature parameters for the PT3H, PT6H are calculated as a min/max value of the airTemperature parameter for previous 3 and 6 hours respectively.
      + The minAirTemperatureInCelsius parameter for the PT12H is calculated using the following formula  
          minAirTemperatureInCelsius = -2.46934 + 0.85674 * minAirTemperatureInCelsiusValueForPrevious12Hours + 0.10476 * maxAirTemperatureInCelsiusValueForPrevious12Hours + 0.03747 * windSpeedInKnotsValueInTheMiddleOf12HourPeriod + 0.23575 * effectiveCloudCoverInOctaValueInTheMiddleOf12HourPeriod + 0.02364 * effectiveCloudCoverInOctaValueAtTheEndOf12HourPeriod
      + The maxAirTemperatureInCelsius parameter for the PT12H is calculated using the following formula  
          maxAirTemperatureInCelsius = 0.566 + 1.01062 * maxAirTemperatureInCelsiusValueForPrevious12Hours + 0.0289 * totalCloudCoverInOctaInTheMiddleOf12HourPeriod -0.03689 * lowCloudCoverInOctaInTheMiddleOf12HourPeriod - 0.0162 * minAirTemperatureInCelsiusValueForPrevious12Hours
      + The min/maxAirTemperature parameter for the PT24H is calculated as min/max value of two previous PT12H min/maxAirTemperature values respectively.
  + The maxUVIndexWithClouds parameter is calculated as a maximum of hourly values
  
negative.code:                 effectiveCloudCoverInOcta, totalCloudCoverInOcta,cloudCoverLowerThan2000MeterInOcta,cloudCoverLowerThan5000MeterInOcta,cloudBaseHeightInMeter,relativeHumidityInPercent,
                  visibilityInMeter,weatherCode,weatherCodeTraditional,clearSkyUVIndex,airTemperatureErrorInKelvin,windSpeedErrorInKnots,freezingLevelHeightInMeter,
                  freezingRainProbabilityInPercent,noSnowPossibleBelowHeightInMeter,snowCertainAboveHeightInMeter,saturationDeficitInHectoPascal,
                  airTemperatureNearGroundInCelsius,visibilityProbabilityLessThan200MeterInPercent,visibilityProbabilityLessThan1000MeterInPercent,
  				convectivePrecipitationProbabilityInPercent,precipitationProbabilityInPercent,precipitationType,hailProbabilityInPercent,
  				snowFallProbabilityInPercent,thunderstormProbabilityInPercent
  - **PT1H** -    maxWindGustInMeterPerSecond,maxWindGustInKnots,maxWindGustInMilesPerHour,sunshineDurationInMinutes,precipitationAmountInMillimeter,precipitationAmountInInch,
                  maxPrecipitationAmountInMillimeter,directRadiationInJoulePerSquareCentimeter,globalRadiationInJoulePerSquareCentimeter,relativeGlobalRadiationInPercent,
                  freshSnowfallInCentimeter,maxFreshSnowfallInCentimeter,relativeSunshineDurationInPercent,windGustProbabilityGreaterThan40KnotsInPercent,
  - **PT3H** -    maxWindSpeedInMeterPerSecond,maxWindSpeedInKnots,maxWindSpeedInMilesPerHour,maxWindGustInMeterPerSecond,maxWindGustInKnots,maxWindGustInMilesPerHour,
                  minAirTemperatureInCelsius,minAirTemperatureInFahrenheit,minAirTemperatureInKelvin,maxAirTemperatureInCelsius,maxAirTemperatureInFahrenheit,
                  maxAirTemperatureInKelvin,mostLikelyLowAirTemperatureInCelsius,mostLikelyLowAirTemperatureInFahrenheit,mostLikelyLowAirTemperatureInKelvin,
  