Chart daily highest temperature

i am currently using mqtt average bars and template nodes to track the average daily temperatures, (copied and pasted from somewhere)but would like to have the same chart with just highest daily temperatures, I'm absolutely hopeless at this so any help would be great . thanks
martin

[
    {
        "id": "8cf6903579d0ffc9",
        "type": "mqtt in",
        "z": "e4c29118d59c6947",
        "name": "living room",
        "topic": "zone2/text",
        "qos": "2",
        "datatype": "auto-detect",
        "broker": "dc0340c9643bd396",
        "nl": false,
        "rap": true,
        "rh": 0,
        "inputs": 0,
        "x": 100,
        "y": 60,
        "wires": [
            [
                "0eec94515a4437c4"
            ]
        ]
    },
    {
        "id": "0eec94515a4437c4",
        "type": "average-bars",
        "z": "e4c29118d59c6947",
        "name": "average-bars",
        "title": "living room",
        "period": "month",
        "yMin": "auto",
        "yMax": "auto",
        "showBarsValue": true,
        "showScaleValue": true,
        "showLastValue": true,
        "showAverageValue": false,
        "showMinimumValue": true,
        "showMaximumValue": true,
        "maxBar": 30,
        "topColor": "#ff0000",
        "bottomColor": "#ffff00",
        "unit": "c",
        "fontColor": "#aaaaaa",
        "barStyle": "Rectangle",
        "decimal": 1,
        "x": 250,
        "y": 60,
        "wires": [
            [
                "334ecb64353a016b"
            ]
        ]
    },
    {
        "id": "334ecb64353a016b",
        "type": "ui_template",
        "z": "e4c29118d59c6947",
        "group": "b203668acaa94c76",
        "name": "",
        "order": 1,
        "width": "18",
        "height": 6,
        "format": "<div ng-bind-html=\"msg.payload\"></div>",
        "storeOutMessages": true,
        "fwdInMessages": true,
        "resendOnRefresh": true,
        "templateScope": "local",
        "className": "",
        "x": 400,
        "y": 60,
        "wires": [
            []
        ]
    },
    {
        "id": "dc0340c9643bd396",
        "type": "mqtt-broker",
        "name": "",
        "broker": "192.168.0.107",
        "port": "1883",
        "clientid": "",
        "autoConnect": true,
        "usetls": false,
        "protocolVersion": "4",
        "keepalive": "60",
        "cleansession": true,
        "autoUnsubscribe": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "birthMsg": {},
        "closeTopic": "",
        "closeQos": "0",
        "closePayload": "",
        "closeMsg": {},
        "willTopic": "",
        "willQos": "0",
        "willPayload": "",
        "willMsg": {},
        "userProps": "",
        "sessionExpiry": ""
    },
    {
        "id": "b203668acaa94c76",
        "type": "ui_group",
        "name": "Default",
        "tab": "723e0c03.ca8984",
        "order": 1,
        "disp": true,
        "width": 18,
        "collapse": false,
        "className": ""
    },
    {
        "id": "723e0c03.ca8984",
        "type": "ui_tab",
        "name": "daily trmperatures",
        "icon": "dashboard",
        "order": 2,
        "disabled": false,
        "hidden": false
    }
]

There are a couple of ways to find the maximum in an array of objects using Javascript.

Just Google something like 'es6 find highest value in an array of objects'.

There are plenty of examples there.

thanks that helped :confused: