anchor.diff:                  "observedUntil": "2016-10-15T12:00:00+02:00",
                   "observedPeriod": "PT6H",
                   "precipitationAmountInMillimeter": 1.5,
  -                "precipitationAmountInInch": 0.059
  +                "precipitationAmountInInch": 0.059,
  +                "pastWeatherCode": 10,
  +                "pastWeatherDescription": "NO SIGNIFICANT WEATHER OBSERVED"
                 }
               ]
             }
  
positive.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
  - **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
  - **PT12H** -   temperatureMaxInCelsius, temperatureMaxInFahrenheit, temperatureMaxInKelvin, temperatureMinInCelsius, temperatureMinInFahrenheit, temperatureMinInKelvin,
                  precipitationAmountInMillimeter, precipitationAmountInInch, maxWindGustInMeterPerSecond, maxWindGustInKilometerPerHour, maxWindGustInMilesPerHour,
                  maxWindGustInBeaufort, maxWindGustInKnots, pressureTendencyDescription, pressureTendencyCode, pressureChangeInHectoPascal
  
negative.code:                 "weatherCode": "2",
                  "weatherCodeTraditional": 2,
                  "snowDepthInCentimeter": 10.8,
                  "snowDepthInInch": 4.252,
                  "typeOfLowCloudsCode": 5,
                  "typeOfLowCloudsDescription": "stratocumulus",
                  "typeOfMediumCloudsCode": 3,
                  "typeOfMediumCloudsDescription": "altocumulus translucidous (mostly transparent)",
                  "typeOfHighCloudsCode": 2,
                  "typeOfHighCloudsDescription": "cirrus spissatus (dense in patches)"
                },
                {
                  "locatedAt": [ -2.2323, 47.4593 ],
  