diff --git a/Heizung/WEBROOT/index.php b/Heizung/WEBROOT/index.php
index 702254a..e79dc6c 100644
--- a/Heizung/WEBROOT/index.php
+++ b/Heizung/WEBROOT/index.php
@@ -9,6 +9,7 @@ try {
     $router->add('abgas', \MVC\Controller\AbgasController::class, 'abgas');
     $router->add('vorlauf', \MVC\Controller\VorlaufController::class, 'vorlauf');
     $router->add('puffer', \MVC\Controller\PufferController::class, 'puffer');
+    $router->add('aussentemp', \MVC\Controller\AussentempController::class, 'aussentemp');
 
     $layout = new \MVC\Layout\Layout('main');
     $layout->setBlock('title', 'MVC Starter');
@@ -17,12 +18,18 @@ try {
     
     // Sidebar Block
     ob_start();
+    $navItems = [
+        'home' => '🏠 Home', 
+        'abgas' => '🔥 Abgas', 
+        'vorlauf' => '🏃‍♂️‍➡️ Vorlauf', 
+        'puffer' => '♨️ Puffer', 
+        'aussentemp' => '🌡️ Außentemperatur'
+    ];
     ?>
     <nav>
-        <a href="?service=home">🏠 Home</a>
-        <a href="?service=abgas">🔥 Abgas</a>
-        <a href="?service=vorlauf">🏃‍♂️‍➡️ Vorlauf</a>
-        <a href="?service=puffer">♨️ Puffer</a>
+        <?php foreach ($navItems as $navKey => $navLabel): ?>
+            <a href="?service=<?= $navKey ?>" class="<?= $service === $navKey ? 'active' : '' ?>"><?= $navLabel ?></a>
+        <?php endforeach; ?>
     </nav>
     <?php
     $layout->setBlock('sidebar', ob_get_clean());
diff --git a/Heizung/WEBROOT/src/MVC/Controller/AussentempController.php b/Heizung/WEBROOT/src/MVC/Controller/AussentempController.php
new file mode 100644
index 0000000..46750d4
--- /dev/null
+++ b/Heizung/WEBROOT/src/MVC/Controller/AussentempController.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace MVC\Controller;
+
+use MVC\Core\Controller;
+use MVC\Model\Messungen;
+
+class AussentempController extends Controller {
+
+    public function aussentemp() {
+
+        $day = $_GET['day'] ?? date('Y-m-d');
+        $datum = \DateTime::createFromFormat('Y-m-d', $day);
+
+        if (!$datum) {
+            $day = date('Y-m-d');
+        }
+
+        $array = Messungen::getAussentempByDay($day);
+        $labels = [];
+        $aussentemp = [];
+
+        foreach ($array as $row) {
+            $labels[] = date('H:i:s', strtotime($row['ts']));
+            $aussentemp[] = (float)$row['aussentemp'];
+        }
+
+        $prevDay = date('Y-m-d', strtotime($day . ' -1 day'));
+        $nextDay = date('Y-m-d', strtotime($day . ' +1 day'));
+
+        return $this->render('aussentemp', [
+            'title' => 'Aussentemperatur Modul',
+            'xtitle' => 'Zeit',
+            'ytitle' => 'Temperatur',
+
+            'array' => $array,
+
+            'labels' => $labels,
+            'aussentemp' => $aussentemp,
+
+            'day' => $day,
+            'prevDay' => $prevDay,
+            'nextDay' => $nextDay,
+        ]);
+    }
+}
\ No newline at end of file
diff --git a/Heizung/WEBROOT/src/MVC/Layout/Templates/main.php b/Heizung/WEBROOT/src/MVC/Layout/Templates/main.php
index 2268918..90b6640 100644
--- a/Heizung/WEBROOT/src/MVC/Layout/Templates/main.php
+++ b/Heizung/WEBROOT/src/MVC/Layout/Templates/main.php
@@ -4,7 +4,11 @@
     <meta charset="UTF-8">
     <title><?= $this->getBlock('title') ?></title>
     <style>
-        :root { --bg: #ffffff; --text: #333; --sidebar: #f4f4f4; --header: #007bff; --accent: #007bff; --border: #ddd; }
+        :root { 
+            --bg: #ffffff; 
+            --text: #333; 
+            --sidebar: #f4f4f4; 
+            --header: #007bff; --accent: #007bff; --border: #ddd; }
         .dark-mode { --bg: #1a1a1a; --text: #f4f4f4; --sidebar: #252525; --header: #111; --accent: #3498db; --border: #333; }
         body { font-family: 'Segoe UI', sans-serif; margin: 0; background: var(--bg); color: var(--text); transition: 0.3s; height: 100vh; overflow: hidden; display: flex; flex-direction: column; }
         .main-header { height: 60px; background: var(--header); color: white; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); z-index: 10; }
@@ -15,6 +19,7 @@
         .btn-toggle:hover { background: rgba(255,255,255,0.1); }
         nav a { display: block; padding: 12px; text-decoration: none; color: inherit; border-radius: 5px; margin-bottom: 5px; }
         nav a:hover { background: rgba(0,0,0,0.05); }
+        nav a.active { background: rgba(0,0,0,0.25); }
         .logo { font-size: 1.4rem; font-weight: bold; }
     </style>
 </head>
diff --git a/Heizung/WEBROOT/src/MVC/Model/Messungen.php b/Heizung/WEBROOT/src/MVC/Model/Messungen.php
index 808e620..7ebe067 100644
--- a/Heizung/WEBROOT/src/MVC/Model/Messungen.php
+++ b/Heizung/WEBROOT/src/MVC/Model/Messungen.php
@@ -34,4 +34,9 @@ class Messungen extends Model {
         $sql = "SELECT ts, kessel_oben, kessel_unten FROM " . self::$table . " WHERE ts LIKE '$day%' ORDER BY ts ASC";
         return self::query($sql)->fetch_all(MYSQLI_ASSOC);
     }
+
+    public static function getAussentempByDay($day) {
+        $sql = "SELECT ts, aussentemp FROM " . self::$table . " WHERE ts LIKE '$day%' ORDER BY ts ASC";
+        return self::query($sql)->fetch_all(MYSQLI_ASSOC);
+    }
 }
\ No newline at end of file
diff --git a/Heizung/WEBROOT/src/MVC/View/aussentemp.php b/Heizung/WEBROOT/src/MVC/View/aussentemp.php
new file mode 100644
index 0000000..181206a
--- /dev/null
+++ b/Heizung/WEBROOT/src/MVC/View/aussentemp.php
@@ -0,0 +1,126 @@
+<?php
+
+/**
+ * @var array $array
+ * @var string $prevDay
+ * @var string $nextDay
+ * @var string $day
+ * @var string $title
+ * @var string $xtitle
+ * @var string $ytitle
+ * @var string $labels
+ * @var string $aussentemp
+ */
+
+?>
+
+<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-zoom"></script>
+
+<div style="height:800px;">
+    <canvas id="logChart"></canvas>
+</div>
+
+<script>
+const ctx = document.getElementById('logChart').getContext('2d');
+
+const logChart = new Chart(ctx, {
+    type: 'line',
+    data: {
+        labels: <?php echo json_encode($labels); ?>,
+
+        datasets: [{
+            label: 'Aussentemperatur',
+
+            data: <?php echo json_encode($aussentemp); ?>,
+
+            borderColor: 'rgba(75, 192, 192, 1)',
+            backgroundColor: 'rgba(75, 192, 192, 0.2)',
+
+            fill: true,
+            tension: 0.1
+        }]
+    },
+
+    options: {
+        responsive: true,
+        maintainAspectRatio: false,
+
+        plugins: {
+            title: {
+                display: true,
+                text: '<?= $title ?>'
+            },
+
+            legend: {
+                display: true,
+                position: 'top'
+            },
+
+            zoom: {
+                pan: {
+                    enabled: true,
+                    mode: 'x'
+                },
+
+                zoom: {
+                    wheel: {
+                        enabled: true
+                    },
+
+                    pinch: {
+                        enabled: true
+                    },
+
+                    mode: 'x'
+                }
+            }
+        },
+
+        interaction: {
+            mode: 'index',
+            intersect: false
+        },
+
+        scales: {
+            x: {
+                title: {
+                    display: true,
+                    text: '<?= $xtitle ?>'
+                }
+            },
+
+            y: {
+                min: 0,
+                max: 50,
+
+                title: {
+                    display: true,
+                    text: '<?= $ytitle ?>'
+                },
+
+                ticks: {
+                    stepSize: 20
+                },
+
+                beginAtZero: true
+            }
+        }
+    }
+});
+</script>
+<div style="margin-bottom:20px;">
+
+    <a href="?service=aussentemp&day=<?php echo $prevDay; ?>">
+    ← Vorheriger Tag
+    </a>
+
+    <strong style="margin:0 20px;">
+        <?php echo $day; ?>
+    </strong>
+
+    <a href="?service=aussentemp&day=<?php echo $nextDay; ?>">
+    Nächster Tag →
+    </a>
+
+</div>
\ No newline at end of file