diff --git a/instat/dlgIDFCurves.Designer.vb b/instat/dlgIDFCurves.Designer.vb
new file mode 100644
index 00000000000..f9af1238740
--- /dev/null
+++ b/instat/dlgIDFCurves.Designer.vb
@@ -0,0 +1,41 @@
+<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
+Partial Class dlgIDFCurves
+    Inherits System.Windows.Forms.Form
+
+    'Form overrides dispose to clean up the component list.
+    <System.Diagnostics.DebuggerNonUserCode()> _
+    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
+        Try
+            If disposing AndAlso components IsNot Nothing Then
+                components.Dispose()
+            End If
+        Finally
+            MyBase.Dispose(disposing)
+        End Try
+    End Sub
+
+    'Required by the Windows Form Designer
+    Private components As System.ComponentModel.IContainer
+
+    'NOTE: The following procedure is required by the Windows Form Designer
+    'It can be modified using the Windows Form Designer.  
+    'Do not modify it using the code editor.
+    <System.Diagnostics.DebuggerStepThrough()> _
+    Private Sub InitializeComponent()
+        Me.SuspendLayout()
+        '
+        'dlgIDFCurves
+        '
+        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
+        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
+        Me.ClientSize = New System.Drawing.Size(487, 450)
+        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow
+        Me.MaximizeBox = False
+        Me.MinimizeBox = False
+        Me.Name = "dlgIDFCurves"
+        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
+        Me.Text = "IDF Curves"
+        Me.ResumeLayout(False)
+
+    End Sub
+End Class
diff --git a/instat/dlgIDFCurves.resx b/instat/dlgIDFCurves.resx
new file mode 100644
index 00000000000..1af7de150c9
--- /dev/null
+++ b/instat/dlgIDFCurves.resx
@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>
\ No newline at end of file
diff --git a/instat/dlgIDFCurves.vb b/instat/dlgIDFCurves.vb
new file mode 100644
index 00000000000..e146ccf6d86
--- /dev/null
+++ b/instat/dlgIDFCurves.vb
@@ -0,0 +1,3 @@
+Public Class dlgIDFCurves
+
+End Class
\ No newline at end of file
diff --git a/instat/frmMain.vb b/instat/frmMain.vb
index 27eb531ec8a..3d47b2e8971 100644
--- a/instat/frmMain.vb
+++ b/instat/frmMain.vb
@@ -2636,4 +2636,8 @@ Public Class frmMain
     Private Sub mnuClimaticDescribeSeasonalGraph_Click(sender As Object, e As EventArgs) Handles mnuClimaticDescribeSeasonalGraph.Click
         dlgSeasonalGraph.ShowDialog()
     End Sub
+
+    Private Sub mnuClimaticDescribeIDF_Click(sender As Object, e As EventArgs) Handles mnuClimaticDescribeIDF.Click
+        dlgIDFCurves.ShowDialog()
+    End Sub
 End Class
diff --git a/instat/instat.vbproj b/instat/instat.vbproj
index a650e9eec1d..eb03c008b07 100644
--- a/instat/instat.vbproj
+++ b/instat/instat.vbproj
@@ -245,6 +245,12 @@
     <Compile Include="dlgFindInVariableOrFilter.vb">
       <SubType>Form</SubType>
     </Compile>
+    <Compile Include="dlgIDFCurves.Designer.vb">
+      <DependentUpon>dlgIDFCurves.vb</DependentUpon>
+    </Compile>
+    <Compile Include="dlgIDFCurves.vb">
+      <SubType>Form</SubType>
+    </Compile>
     <Compile Include="dlgImportFromPostgres.Designer.vb">
       <DependentUpon>dlgImportFromPostgres.vb</DependentUpon>
     </Compile>
@@ -3044,6 +3050,9 @@
     <EmbeddedResource Include="dlgHomogenization.resx">
       <DependentUpon>dlgHomogenization.vb</DependentUpon>
     </EmbeddedResource>
+    <EmbeddedResource Include="dlgIDFCurves.resx">
+      <DependentUpon>dlgIDFCurves.vb</DependentUpon>
+    </EmbeddedResource>
     <EmbeddedResource Include="dlgImportERA5Data.resx">
       <DependentUpon>dlgImportERA5Data.vb</DependentUpon>
     </EmbeddedResource>