lastseven.js

[{
  $match: {
    $expr: {
      $gt: ["$date", {
        $dateSubtract: {
          startDate: "$$NOW",
          unit: "day",
          amount: 7
        }
      }]
    }
  }
}, {
  $setWindowFields: {
    partitionBy: "$location",
    sortBy: {
      date: 1
    },
    output: {
      tenminavg: {
        $avg: "$temp",
        window: {
          range: [-60, 60],
          unit: "minute"
        }
      }
    }
  }
}]