You should download a copy for your local machine and use a newer version. Then you can create a fallback to your jQuery source:
<head>
<meta charset="utf-8">
<title>Super Mario!</title>
<link rel="stylesheet" type="text/css" href="https://stackoverflow.com/questions/29851424/css.css"/>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script type="text/javascript">
if (typeof jQuery == 'undefined') {
document.write(unescape("%3Cscript src="path/to/jquery-1.11.2.min.js" type="text/javascript"%3E%3C/script%3E"));
}
</script>
<script type="text/javascript" src="script.js"></script>
</head>
If the CDN fails this fallback will seek and load the local copy of jQuery.
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solved JQuery files NOT working