diff --git a/internal/rdb/inspect.go b/internal/rdb/inspect.go
index 44cec56..72b6b00 100644
--- a/internal/rdb/inspect.go
+++ b/internal/rdb/inspect.go
@@ -28,6 +28,13 @@ type Stats struct {
 	Timestamp  time.Time
 }
 
+// DailyStats holds aggregate data for a given day.
+type DailyStats struct {
+	Processed int
+	Failed    int
+	Time      time.Time
+}
+
 // EnqueuedTask is a task in a queue and is ready to be processed.
 type EnqueuedTask struct {
 	ID      xid.ID
@@ -131,6 +138,51 @@ func (r *RDB) CurrentStats() (*Stats, error) {
 	}, nil
 }
 
+// HistoricalStats returns a list of stats from the last n days.
+func (r *RDB) HistoricalStats(n int) ([]*DailyStats, error) {
+	if n < 1 {
+		return []*DailyStats{}, nil
+	}
+	const day = 24 * time.Hour
+	now := time.Now().UTC()
+	var days []time.Time
+	var keys []string
+	for i := 0; i < n; i++ {
+		ts := now.Add(-time.Duration(i) * day)
+		days = append(days, ts)
+		keys = append(keys, base.ProcessedKey(ts))
+		keys = append(keys, base.FailureKey(ts))
+	}
+	script := redis.NewScript(`
+	local res = {}
+	for _, key in ipairs(KEYS) do
+	  local n = redis.call("GET", key)
+	  if not n then
+		n = 0
+	  end
+	  table.insert(res, tonumber(n))
+	end
+	return res
+	`)
+	res, err := script.Run(r.client, keys, len(keys)).Result()
+	if err != nil {
+		return nil, err
+	}
+	data, err := cast.ToIntSliceE(res)
+	if err != nil {
+		return nil, err
+	}
+	var stats []*DailyStats
+	for i := 0; i < len(data); i += 2 {
+		stats = append(stats, &DailyStats{
+			Processed: data[i],
+			Failed:    data[i+1],
+			Time:      days[i/2],
+		})
+	}
+	return stats, nil
+}
+
 // RedisInfo returns a map of redis info.
 func (r *RDB) RedisInfo() (map[string]string, error) {
 	res, err := r.client.Info().Result()
diff --git a/internal/rdb/inspect_test.go b/internal/rdb/inspect_test.go
index 8738708..949d23c 100644
--- a/internal/rdb/inspect_test.go
+++ b/internal/rdb/inspect_test.go
@@ -166,6 +166,55 @@ func TestCurrentStatsWithoutData(t *testing.T) {
 	}
 }
 
+func TestHistoricalStats(t *testing.T) {
+	r := setup(t)
+	now := time.Now().UTC()
+
+	tests := []struct {
+		n int // number of days
+	}{
+		{90},
+		{7},
+		{0},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r.client)
+
+		// populate last n days data
+		for i := 0; i < tc.n; i++ {
+			ts := now.Add(-time.Duration(i) * 24 * time.Hour)
+			processedKey := base.ProcessedKey(ts)
+			failedKey := base.FailureKey(ts)
+			r.client.Set(processedKey, (i+1)*1000, 0)
+			r.client.Set(failedKey, (i+1)*10, 0)
+		}
+
+		got, err := r.HistoricalStats(tc.n)
+		if err != nil {
+			t.Errorf("RDB.HistoricalStats(%v) returned error: %v", tc.n, err)
+			continue
+		}
+
+		if len(got) != tc.n {
+			t.Errorf("RDB.HistorycalStats(%v) returned %d daily stats, want %d", tc.n, len(got), tc.n)
+			continue
+		}
+
+		for i := 0; i < tc.n; i++ {
+			want := &DailyStats{
+				Processed: (i + 1) * 1000,
+				Failed:    (i + 1) * 10,
+				Time:      now.Add(-time.Duration(i) * 24 * time.Hour),
+			}
+			if diff := cmp.Diff(want, got[i], timeCmpOpt); diff != "" {
+				t.Errorf("RDB.HistoricalStats %d days ago data; got %+v, want %+v; (-want,+got):\n%s", i, got[i], want, diff)
+			}
+		}
+	}
+
+}
+
 func TestRedisInfo(t *testing.T) {
 	r := setup(t)
 
diff --git a/tools/asynqmon/cmd/history.go b/tools/asynqmon/cmd/history.go
new file mode 100644
index 0000000..d716020
--- /dev/null
+++ b/tools/asynqmon/cmd/history.go
@@ -0,0 +1,86 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/go-redis/redis/v7"
+	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/spf13/cobra"
+)
+
+// historyCmd represents the history command
+var historyCmd = &cobra.Command{
+	Use:   "history [num of days]",
+	Short: "Shows historical aggregate data",
+	Long: `History (asynqmon history) will show the number of processed tasks
+as well as the error rate for the last n days.
+
+Example: asynqmon history 7 -> Shows stats from the last 7 days`,
+	Args: cobra.ExactArgs(1),
+	Run:  history,
+}
+
+func init() {
+	rootCmd.AddCommand(historyCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// historyCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// historyCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
+
+func history(cmd *cobra.Command, args []string) {
+	n, err := strconv.Atoi(args[0])
+	if err != nil {
+		fmt.Printf(`Error: Invalid argument. Argument has to be an integer.
+
+Usage: asynqmon history [num of days]
+`)
+		os.Exit(1)
+	}
+	if err != nil {
+
+	}
+	c := redis.NewClient(&redis.Options{
+		Addr: uri,
+		DB:   db,
+	})
+	r := rdb.NewRDB(c)
+
+	stats, err := r.HistoricalStats(n)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	printDailyStats(stats)
+}
+
+func printDailyStats(stats []*rdb.DailyStats) {
+	format := strings.Repeat("%v\t", 4) + "\n"
+	tw := new(tabwriter.Writer).Init(os.Stdout, 0, 8, 2, ' ', 0)
+	fmt.Fprintf(tw, format, "Date (UTC)", "Processed", "Failed", "Error Rate")
+	fmt.Fprintf(tw, format, "----------", "---------", "------", "----------")
+	for _, s := range stats {
+		var errrate string
+		if s.Processed == 0 {
+			errrate = "N/A"
+		} else {
+			errrate = fmt.Sprintf("%.2f%%", float64(s.Failed)/float64(s.Processed)*100)
+		}
+		fmt.Fprintf(tw, format, s.Time.Format("2006-01-02"), s.Processed, s.Failed, errrate)
+	}
+	tw.Flush()
+}