anchor.diff:  
   The "weatherCode" parameter refers to the WMO code table "0 20 003 - Present weather".
   The "weatherCodeTraditional" parameter refers to the WMO code table "4677".
  +The "pastWeatherCode" parameter refers to the WMO code table "0 20 004 - Past weather".
   
   + Parameters
       + meteoGroupStationIds: `3007237` (string, optional) - station ids; can be several stations separated by comma
  
positive.code:                 "observedUntil": "2016-10-15T12:00:00+02:00",
                  "observedPeriod": "PT6H",
                  "precipitationAmountInMillimeter": 1.5,
                  "precipitationAmountInInch": 0.059
                }
              ]
            }
  
negative.code:                 windSpeedInBeaufort, windSpeedInKnots, windDirectionInDegree, dewPointTemperatureInCelsius, dewPointTemperatureInFahrenheit, dewPointTemperatureInKelvin,
                  relativeHumidityInPercent, effectiveCloudCoverInOcta, totalCloudCoverInOcta, visibilityInMeter, visibilityInKilometer,
                  visibilityInNauticalMile,visibilityInStatuteMile, weatherCode, weatherCodeTraditional,snowDepthInCentimeter,snowDepthInInch, waterTemperatureInCelsius, waterTemperatureInFahrenheit,
                  waterTemperatureInKelvin, totalWaveHeightInMeter, totalWaveHeightInFeet, totalWavePeriodInSecond, seaHeightInMeter, seaHeightInFeet, seaPeriodInSecond, mediumCloudCoverInOcta,
                  typeOfLowCloudsCode, typeOfLowCloudsDescription, typeOfMediumCloudsCode, typeOfMediumCloudsDescription, typeOfHighCloudsCode, typeOfHighCloudsDescription
  - **PT1H** -    windGustInMeterPerSecond, windGustInKilometerPerHour, windGustInMilesPerHour, windGustInBeaufort, windGustInKnots, precipitationAmountInMillimeter,
                  precipitationAmountInInch, freshSnowfallInCentimeter, freshSnowfallInInch, pressureTendencyDescription, pressureTendencyCode
  - **PT3H** -    pressureTendencyDescription, pressureTendencyCode, pressureChangeInHectoPascal, precipitationAmountInMillimeter,precipitationAmountInInch, maxWindGustInMeterPerSecond, maxWindGustInKilometerPerHour,
                  maxWindGustInMilesPerHour, maxWindGustInBeaufort, maxWindGustInKnots
  - **PT6H** -    precipitationAmountInMillimeter,precipitationAmountInInch, maxWindGustInMeterPerSecond, maxWindGustInKilometerPerHour, maxWindGustInMilesPerHour, maxWindGustInBeaufort,
                  maxWindGustInKnots, pressureTendencyDescription, pressureTendencyCode, pressureChangeInHectoPascal, pastWeatherCode, pastWeatherDescription
  - **PT12H** -   temperatureMaxInCelsius, temperatureMaxInFahrenheit, temperatureMaxInKelvin, temperatureMinInCelsius, temperatureMinInFahrenheit, temperatureMinInKelvin,
                  precipitationAmountInMillimeter, precipitationAmountInInch, maxWindGustInMeterPerSecond, maxWindGustInKilometerPerHour, maxWindGustInMilesPerHour,
                  maxWindGustInBeaufort, maxWindGustInKnots, pressureTendencyDescription, pressureTendencyCode, pressureChangeInHectoPascal
  