<WeatherDataPeriods> elements are returned for <Sites> that include OutputFields in the WeatherData Request.  If OutputFields are not specified, no <WeatherDataPeriods> elements will be returned in the WeatherDataResult Response.  Returned <WeatherDataPeriods> attributes will also correspond to the request.


The specification of the desired time resolution of the OutputFields.

Possible values: An integer of value 60.

Currently supported values:


The specification of the absolute start time of the data request.

Possible values: A string value such as 2011-11-11T00:00:00-08:00. Follows date:time plus GMT offset convention out of ISO_8601, for example: YYYY-MM-DDTHH:MM:SS-XX:YY, where XX:YY reflects the GMT offset (+ or -).