Response weather data elements

The following are the list of properties in a day or hourly data object:

cloudcover – how much of the sky is covered in cloud ranging from 0-100%

conditions – textual representation of the weather conditions. See Weather Data Conditions.

description – longer text descriptions suitable for displaying in weather displays. The descriptions combine the main features of the weather for the day such as precipitation or amount of cloud cover. Daily descriptions are provided for historical and forecast days. When the timeline request includes the model forecast period, a seven day outlook description is provided at the root response level.

datetime – ISO formatted date, time or datetime value indicating the date and time of the weather data in the locale time zone of the requested location

datetimeEpoch – number of seconds since 1st January 1970 in UTC time

tzoffset – the time zone offset in hours. This will only occur in the data object if it is different from the global timezone offset.

dew – dew point temperature

feelslike – what the temperature feels like accounting for heat index or windchill

hours – array of hourly weather data objects. This is a child of each of the daily weather object when hours are selected.

humidity – relative humidity in %

icon – a fixed, machine readable summary that can be used to display an icon

moonphase – represents the fractional portion through the current moon lunation cycle ranging from 0 (the new moon) to 0.5 (the full moon) and back to 1 (the next new moon)

normal – array of normal weather data values – Each weather data normal is an array of three values representing, in order, the minimum value over the statistical period, the mean value, and the maximum value over the statistical period.

offsetseconds (hourly only) – time zone offset for this weather data object in seconds – This value may change for a location based on daylight saving time observation.

precip – the amount of precipitation that fell or is predicted to fall in the period

precipcover (days only) – the proportion of hours where there was non-zero precipitation

precipprob (forecast only) – the likelihood of measurable precipitation ranging from 0% to 100%

preciptype (forecast only)– an array indicating the type(s) of precipitation expected. Possible values include rain, snow, freezingrain and ice.

pressure – the sea level atmospheric or barometric pressure in millibars (or hectopascals)

snow – the amount of snow that fell or is predicted to fall

snowdepth – the depth of snow on the ground

source – the type of weather data used for this weather object. – Values include historical observation (“obs”), forecast (“fcst”), historical forecast (“histfcst”) or statistical forecast (“stats”). If multiple types are used in the same day, “comb” is used. Today is typically a combination of historical observations and forecast data.

stations (historical only) – the weather stations used when collecting an historical observation record

sunrise (day only) – The formatted time of the sunrise (For example “07:33:15”)

sunriseEpoch – sunrise time specified as number of seconds since 1st January 1970 in UTC time

sunset – The formatted time of the sunset (For example “18:12:55”)

sunsetEpoch – sunset time specified as number of seconds since 1st January 1970 in UTC time

temp– temperature at the location

tempmax (day only) – maximum temperature at the location.

tempmin (day only) – minimum temperature at the location.

uvindex – a value between 0 and 10 indicating the level of ultra violet (UV) exposure for that hour or day. 10 represents high level of exposure, and 0 represents no exposure. The UV index is calculated based on amount of short wave solar radiation which in turn is a level the cloudiness, type of cloud, time of day, time of year and location altitude. Daily values represent the maximum value of the hourly values.

visibility – distance at which distant objects are visible

winddir – direction from which the wind is blowing

windgust– instantaneous wind speed at a location – May be empty if it is not significantly higher than the wind speed.

windspeed– average wind speed over a minute

solarradiation – (W/m2) the solar radiation power at the instantaneous moment of the observation (or forecast prediction). See the full solar radiation data documentation.

solarenergy – (MJ or kWh) indicates the total energy from the sun that builds up over an hour or day. See the full solar radiation data documentation.

severerisk – (forecast only) – a value between 0 and 100 representing the likelihood of severe weather such as thunderstorms, hail or tornados. 0 is very low chance of severe weather. 30-60 represents there is a chance of severe weather, 60-100 indicates there is a high chance of severe weather.

degreedays (day only) – optional elements indicating the number of degree days for this date. See the degree days API for more information on degree days. To turn degree days and degree day accumulation on, use the elements parameter.