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Weather Forecast with Yahoo! Weather RSS Feed

, 13 Jul 2009 CPOL
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A class based on the Yahoo! Weather RSS feed.

Screenshot - Weather_forecast.jpg


Every time I wanted to use a weather forecast for my site, I found it too confusing. Each method I found had problems - some of the weather forecast Web services did not work properly. Eventually I noticed that Yahoo! has an RSS for its weather forecast. I decided to make a program to use that in my site and I created a class for it! I hope it will be useful for others who want to have weather forecasts in their programs.

Yahoo! Weather RSS feed

The Yahoo! Weather RSS feed enables you to get up-to-date weather information for your location. You can save this feed in My Yahoo! or your favorite feed aggregate. You can also incorporate the RSS data into your own Web site or client application. The Yahoo! Weather RSS feed is a dynamically-generated feed that is based on zip code or Location ID.

RSS Request

The Yahoo! Weather RSS feed request follows simple HTTP GET syntax: start with a base URL and then add parameters and values after a question mark (?). Multiple parameters are separated by an ampersand (&). There are two parameters for Weather RSS:

  • p for location
  • u for degrees units (Fahrenheit or Celsius)

RSS Response

The Yahoo! Weather RSS feed is an XML document that conforms to RSS 2.0 specifications. RSS is an XML document containing: a single channel element representing the feed, several elements containing metadata about the feed itself, and one or more item elements describing individual items within the feed. You can find all information about these elements on the Yahoo Developer page here. As it is represented in an XML document, we can convert it to classes by XML Serialization in .NET.

Understanding XML Serialization in the .NET Framework

XML Serialization enables you to convert common language runtime objects into XML documents or streams, and vise versa. XML Serialization makes it possible to convert XML documents into such a meaningful format that all programming languages can process the converted documents without any difficulty. You don't need to know much about XML Serialization to use this code, but it can help you to change or customize it yourself.

Using the Code

Using this code is as simple as making an instance of it and then sending its required parameters (Yahoo! Weather RSS parameters) to its constructor. The first parameter is US zip code or Location ID. The second one is Units for temperature. Send "f" for Fahrenheit or "c" for Celsius and then you can use it! Like this:

'//For example we send "IRXX0018" for Location ID of Tehran, and we want 
'//Units for temperature as Fahrenheit
 Dim t As New YahooWeatherForecast("IRXX0018", "f")


  • 25th April, 2007: Initial post
  • 15th May, 2007 - Updated source file
  • 3rd May, 2008: Updated source file


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Farhad Siasar Djahantighi 2

Iran (Islamic Republic Of) Iran (Islamic Republic Of)
No Biography provided

Comments and Discussions

QuestionWhy cannot I download the code? Pinmembertdyso_zmh3-May-12 20:32 
GeneralMy vote of 5 Pinmembermahnazfekri26-Jul-11 1:19 
QuestionAdding Severe Weather Watch or Warnings or Both to your Library? Pinmembertimnboys25-Jun-10 11:09 
GeneralMy vote of 1 PinmvpDave Kreskowiak16-Jul-09 9:59 
QuestionAdding the Dew Point to your library? Pinmemberrspercy6014-Jul-09 16:32 
AnswerRe: Adding the Dew Point to your library? PinmemberFarhad Siasar Djahantighi14-Jul-09 19:12 
QuestionHeat Index? Pinmemberrspercy609-Jul-09 16:46 
AnswerRe: Heat Index?.....Answer Pinmemberrspercy6010-Jul-09 12:17 
Here is the code to figure the Heat Index....
    Dim HI As Long     'Heat Index
    Const C1 As Double = -42.379
    Const C2 As Double = 2.04901523
    Const C3 As Double = 10.14333147
    Const C4 As Double = 0.22475541
    Const C5 As Double = 6.83783 * (10 ^ -3)
    Const C6 As Double = 5.481717 * (10 ^ -2)
    Const C7 As Double = 1.22874 * (10 ^ -3)
    Const C8 As Double = 8.5282 * (10 ^ -4)
    Const C9 As Double = 1.99 * (10 ^ -6)
    Private Function GetHeatIndex(ByVal h As Long) As String
        Dim HINDX As Long
        HINDX = ((C1 + C2 * CInt(Label6.Text)) + (C3 * CInt(lblHumidity.Text)) - (C4 * CInt(Label6.Text) * CInt(lblHumidity.Text)) - _
             (C5 * CInt(Label6.Text) * CInt(Label6.Text)) - (C6 * CInt(lblHumidity.Text) * CInt(lblHumidity.Text)) + _
             (C7 * CInt(Label6.Text) * CInt(Label6.Text) * CInt(lblHumidity.Text)) + _
             (C8 * CInt(Label6.Text) * CInt(lblHumidity.Text) * CInt(lblHumidity.Text)) - _
             (C9 * (CInt(Label6.Text) * CInt(Label6.Text)) * (CInt(lblHumidity.Text) * CInt(lblHumidity.Text))))
        h = HINDX
        Return h
    End Function
Here is how you call it...
     Label14.Text = GetHeatIndex(HI)
Thats it.
1 + 1 = 186,440....Depending on the species.

QuestionHow to get started Pinmembermark lonsbury4-Apr-09 6:04 
AnswerRe: How to get started PinmemberFarhad Siasar Djahantighi10-Jul-09 19:57 

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