diff --git a/app/aggregate.html b/app/aggregate.html
new file mode 100644
index 0000000..936d046
--- /dev/null
+++ b/app/aggregate.html
@@ -0,0 +1,145 @@
+<!doctype html>
+  <head>
+    <meta charset="utf-8" />
+    <title>openSenseMap Dataview</title>
+    <style>
+      body { font-family: sans; }
+      th, td { padding: 10px; text-align: right; }
+      tr:nth-child(odd) { background: #eee; }
+    </style>
+  </head>
+
+  <body>
+    <h1 id="title">loading ...</h1>
+    <h4 id="subtitle"></h4>
+
+    <div>
+      <button onclick="loadConfig('&phenomenon=Niederschlag&operation=sum')">Niederschlag</button>
+      <button onclick="loadConfig('&phenomenon=Temperatur&operation=arithmeticMean')">ø Temperatur</button>
+      <button onclick="loadConfig('&phenomenon=Temperatur&operation=max')">max. Temperatur</button>
+      <button onclick="loadConfig('&phenomenon=Temperatur&operation=min')">min. Temperatur</button>
+      <button onclick="loadConfig('&phenomenon=PM2.5&operation=max')">max. Feinstaub</button>
+    </div>
+    <div>
+      <button onclick="loadConfig('&windowSize=30 days', reset=false)">Monat</button>
+      <button onclick="loadConfig('&windowSize=1 week', reset=false)">Woche</button>
+      <button onclick="loadConfig('&windowSize=1 day', reset=false)">Tag</button>
+      <button onclick="loadConfig('&windowSize=1 hour', reset=false)">Stunde</button>
+    </div>
+    <br/>
+
+    <div id="status"></div>
+
+    <table id="datatable"></table>
+
+
+    <script>
+      const defaultConfig = {
+        boxId: '5b26181b1fef04001b69093c',
+        phenomenon: 'Niederschlag',
+        operation: 'sum',
+        start: new Date('2019-04-01').toISOString(),
+        end:   new Date().toISOString(),
+        windowSize: '30 days',
+      }
+
+      const config = Object.assign(defaultConfig, parseHash())
+      main(config).catch(console.error)
+
+
+      async function main (config) {
+        try {
+          const data = await fetchOsemDataAggregate(config)
+
+          const table = document.querySelector('#datatable')
+          populateTable(table, data, config)
+
+          const title = `${data['boxName']} - ${data['phenomenon']}`
+          document.querySelector('#title').innerText = title
+          document.title = title
+          const subtitle = `${config.operation} per ${config.windowSize}`
+          document.querySelector('#subtitle').innerText = subtitle
+        } catch (err) {
+          document.querySelector('#status').innerText = err
+        }
+      }
+
+      function parseHash () {
+        const kvPairs = window.location.search
+          // remove leading ?
+          .slice(1)
+          // create objects from kvpairs
+          .split('&')
+          .map(kv => {
+            [k,v] = kv.split('=')
+            return { [k]: decodeURIComponent(v) }
+          })
+
+        return Object.assign.apply(null, kvPairs) // combine objects
+      }
+
+      async function fetchOsemDataAggregate (config) {
+        const {
+          boxId,
+          phenomenon,
+          operation,
+          start,
+          end,
+          windowSize,
+         } = config
+
+        const url = `https://api.opensensemap.org/statistics/descriptive?boxid=${boxId}&from-date=${start}&to-date=${end}&phenomenon=${phenomenon}&window=${windowSize}&operation=${operation}&columns=boxName,unit,phenomenon&format=json&download=false`
+        const res = await fetch(url)
+        return (await res.json())[0]
+      }
+
+      function populateTable (table, data, config) {
+        const dateFormat = d => new Date(d).toLocaleDateString('de')
+        const valFormat = v => Math.round(v * (10 ** 2)) / (10 ** 2)
+        const addRow = (left, right) => {
+          const row = document.createElement('tr')
+          row.innerHTML = `<td>${left}</td><td>${right}</td>`
+          table.appendChild(row)
+        }
+
+        const dates = Object.keys(data).filter(k => k.startsWith('20')).sort()
+
+        for (let i = 0; i < dates.length; i++) {
+          const dateFrom = dates[i]
+          const dateTo   = dates[i + 1] || new Date()
+          const val      = data[dates[i]]
+
+          const left  = `${dateFormat(dateFrom)} - ${dateFormat(dateTo)}`
+          const right = `${valFormat(val)} ${data['unit']}`
+          addRow(left, right)
+        }
+
+        // add aggregate of all values
+        let aggregate = null
+        switch (config.operation) {
+          case 'sum':
+            aggregate = dates.map(d => data[d]).reduce((s, v) => s += v, 0)
+            break
+          case 'arithmeticMean':
+            aggregate = dates.map(d => data[d]).reduce((s, v) => s += v, 0) / dates.length
+            break
+          case 'max':
+            aggregate = Math.max.apply(null, dates.map(d => data[d]))
+            break
+          case 'min':
+            aggregate = Math.min.apply(null, dates.map(d => data[d]))
+            break
+        }
+        if (aggregate)
+          addRow(config.operation, `${valFormat(aggregate)} ${data['unit']}`)
+      }
+
+      function loadConfig (queryString, reset = true) {
+        if (reset)
+          window.location.search = queryString
+        else
+          window.location.search += queryString
+      }
+    </script>
+  </body>
+</html>
diff --git a/app/assets/scripts/views/app.js b/app/assets/scripts/views/app.js
index 0edcdcd..f811180 100644
--- a/app/assets/scripts/views/app.js
+++ b/app/assets/scripts/views/app.js
@@ -13,11 +13,6 @@ var App = React.createClass({
   },
 
   render: function () {
-
-    const monthStart = new Date('2019-01-01').toISOString();
-    const monthEnd   = new Date().toISOString();
-    const monthRainUrl = `https://api.opensensemap.org/statistics/descriptive?boxid=${config.senseBox.id}&from-date=${monthStart}&to-date=${monthEnd}&phenomenon=Niederschlag&window=30d&operation=sum&columns=boxName,unit&format=json&download=false`
-
     return (
       <div>
         <header className='site-header' role='banner'>
@@ -27,7 +22,7 @@ var App = React.createClass({
               <span>
                 <a target='_blank' href={'https://opensensemap.org/explore/' + config.senseBox.id}>🗺️ Karte</a>
                 <br/>
-                <a target='_blank' href={monthRainUrl}>Niederschlag / Monat</a>
+                <a href='./aggregate.html'>Daten-Aggregation</a>
               </span>
             </div>
           </div>
