Get-Weather.ps1

function Get-LongLat
{
    [CmdletBinding()]
    param
    (
        [Parameter(
            Mandatory = $true,
            ValueFromPipelineByPropertyName = $true
        )]
        [string[]]$ZipCode
    )

    process
    {
        foreach($z in $ZipCode)
        {
            Write-Verbose "Getting geometry for $z"

            $data = Invoke-RestMethod -Method Get -Uri "http://maps.googleapis.com/maps/api/geocode/json?address=$z"

            $obj = [pscustomobject]@{
                ZipCode   = $z
                Address   = $data.results.formatted_address
                Latitude  = $data.results.geometry.location.lat
                Longitude = $data.results.geometry.location.lng
            }

            Write-Output $obj
        }
    }
}

function Get-Forecast
{
    [CmdletBinding()]
    param
    (
        [Parameter(
            Mandatory = $true,
            ValueFromPipelineByPropertyName = $true
        )]
        [string]$Latitude,

        [Parameter(
            Mandatory = $true,
            ValueFromPipelineByPropertyName = $true
        )]
        [string]$Longitude,

        [Parameter(
            Mandatory = $false,
            ValueFromPipelineByPropertyName = $true
        )]
        [string]$Apikey = 'myapikeyhere'
    )

    process
    {
        Write-Verbose "Getting forecast for $Latitude,$Longitude"

        $data = Invoke-RestMethod -Method Get -Uri "https://api.forecast.io/forecast/$ApiKey/$Latitude,$Longitude"

        Write-Output $data
    }
}