You can't put tooltips on the axis values.  You can put annotations there, 
though, and they work similarly to tooltips:

var data = new google.visualization.DataTable();
data.addColumn('string', 'month');
data.addColumn({'type': 'string', 'role': 'annotation'});
data.addColumn({'type': 'string', 'role': 'annotationText'});
data.addColumn('number', 'Sold Pencils');
data.addRows([
    ['FEB', 'foo', 'febuary', 10],
    ['JAN', 'bar', 'xhi', 2310]
]); 

On Thursday, August 16, 2012 8:10:11 PM UTC-4, API Developer wrote:
>
> Hey guys, 
>
> Do you know if it's possible to place a tooltip on the domain of the data? 
> I've been trying and so far haven't been successful.
> Ex:
>  var data = new google.visualization.DataTable();
>   data.addColumn('string', 'month');
>   data.addColumn({'type': 'string', 'role', 'tooltip'});
>   data.addColumn('number', 'Sold Pencils');
>                   
>   data.addRows([
>                  ['FEB', 'febuary', 10],
>                  ['JAN', 'xhi', 2310]
>                ]);
>
>   // Create and draw the visualization.
>   var ac = new google.visualization.AreaChart(document.getElementById(
> 'visualization'));
>   ac.draw(data, {
>     title : 'Monthly Coffee Production by Country',
>     isStacked: true,
>     width: 600,
>     height: 400,
>     vAxis: {title: "Cups"},
>     hAxis: {title: "Month"}
>   });
> }
>

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