[{"date":"1-10-2020","time":"20:09","temperature":20},{"date":"1-10-2020","time":"20:11","temperature":19},{"date":"1-10-2020","time":"20:15","temperature":18},{"date":"1-10-2020","time":"20:18","temperature":18},]

db.collection.aggregate([{$match:{time:{$gte:"20:09",$lte:"20:15"}}},{$group:{_id:null,avg:{$avg:"$temperature"},min:{$min:"$temperature"},max:{$max:"$temperature"},root:{$push:"$$ROOT"}}},{$unwind:"$root"},{"$replaceRoot":{"newRoot":{"$mergeObjects":["$root",{"MIN":"$min","MAX":"$max","AVG":"$avg"}]}}},/** {*//** $merge: {*//** into: "collection",*//** on: "_id",*//** whenMatched: "replace"*//** }*//** }*/])