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Apps & Services HABPanel
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For those who want to try my Widget, it downloads the hourly weather data from WUnderground as JSON string, stores it in an Item. Then a rule parses the JSON and calculates the MAX/MIN values for the temperature. The Habpanel widget displays a table with the data including a graph for the temperature.
Requires the HTTP Binding and the JSONPath Transformation.

Widget:
http://faure.ca/~paul/WeatherHourly.widget.json

Items:

String  WeatherHourly_json  "JSON [%s]"       {http="<[weatherHourly:3000000:JSONPATH($.hourly_forecast)]"}
Number  WeatherHourly_max   "MAX [%.2f]"
Number  WeatherHourly_min   "MIN [%.2f]"
Number  WeatherHourly_avg   "AVG [%.2f]"

Rules:

rule "WUndergound hourly change"
when
        Time cron "0 */15 * * * ?" or
        Item WeatherHourly_json changed
then
        var String WeatherHourly_temp = "NULL"
        var String WeatherHourly_ftemp = "NULL"
        logInfo("HourlyWeather", "Data changed, recalculate min/max")
        if(WeatherHourly_json.state.toString == "NULL"){
          logInfo("HourlyWeather", "Data1 is NULL")
          //WeatherHourly_temp.sendCommand("NULL")
          //WeatherHourly_ftemp.sendCommand("NULL")
        }else{
          WeatherHourly_temp = transform("JSONPATH", "$.[0:13].temp.metric", WeatherHourly_json.state.toString)
          WeatherHourly_ftemp = transform("JSONPATH", "$.[0:13].feelslike.metric", WeatherHourly_json.state.toString)
          if(WeatherHourly_temp == "NULL" || WeatherHourly_ftemp == "NULL"){
            logInfo("HourlyWeather", "Data2 is NULL")
            WeatherHourly_max.sendCommand(0)
            WeatherHourly_min.sendCommand(0)
            WeatherHourly_avg.sendCommand(0)
          }else{
            var temp='{temp:[' + WeatherHourly_temp.replace('"', '').replace('[','').replace(']','') + ',' + WeatherHourly_ftemp.replace('"', '').replace('[','').replace(']','') + ']}'
            logInfo("HourlyWeather", "Data: " + temp)
            var max=transform("JSONPATH", "temp.max()", temp)
            var min=transform("JSONPATH", "temp.min()", temp)
            var avg=transform("JSONPATH", "temp.avg()", temp)
            WeatherHourly_max.sendCommand(max)
            WeatherHourly_min.sendCommand(min)
            WeatherHourly_avg.sendCommand(avg)
            logInfo("HourlyWeather", "MIN="+min+":MAX="+max)
          }
        }
end

HTTP Binding:

weatherHourly.url=http://api.wunderground.com/api/[APIKEY]/hourly/q/45.4347982,-75.5739861.json
weatherHourly.updateInterval=3000000