diff --git a/frontend/components/dashboard/DetailMiniTemperatureChart.tsx b/frontend/components/dashboard/DetailMiniTemperatureChart.tsx
index 82dda219..bc33b86c 100644
--- a/frontend/components/dashboard/DetailMiniTemperatureChart.tsx
+++ b/frontend/components/dashboard/DetailMiniTemperatureChart.tsx
@@ -47,7 +47,7 @@ export function DetailMiniTemperatureChart({ detail }: { detail: CityDetail }) {
         label: forecastLabel,
         pointRadius: 0,
         spanGaps: true,
-        tension: 0.28,
+        tension: 0.1,
       },
     ];
 
@@ -60,7 +60,7 @@ export function DetailMiniTemperatureChart({ detail }: { detail: CityDetail }) {
         label: calibratedLabel,
         pointRadius: 0,
         spanGaps: true,
-        tension: 0.3,
+        tension: 0.1,
       });
     }
 
diff --git a/frontend/components/dashboard/DetailPanelContent.module.css b/frontend/components/dashboard/DetailPanelContent.module.css
index 395121b6..5143832d 100644
--- a/frontend/components/dashboard/DetailPanelContent.module.css
+++ b/frontend/components/dashboard/DetailPanelContent.module.css
@@ -106,8 +106,7 @@
 }
 
 .root :global(.detail-mini-chart canvas) {
-  width: 100% !important;
-  height: 100% !important;
+  display: block;
 }
 
 .root :global(.detail-mini-chart-legend) {
diff --git a/frontend/components/dashboard/FutureForecastModal.module.css b/frontend/components/dashboard/FutureForecastModal.module.css
index 3ba4d053..1c9ef44f 100644
--- a/frontend/components/dashboard/FutureForecastModal.module.css
+++ b/frontend/components/dashboard/FutureForecastModal.module.css
@@ -785,8 +785,6 @@
 }
 
 .root :global(.intraday-scene-frame canvas) {
-  width: 100%;
-  height: 100%;
   display: block;
 }
 
diff --git a/frontend/components/dashboard/FutureForecastModalChart.tsx b/frontend/components/dashboard/FutureForecastModalChart.tsx
index 916da92b..59aae99d 100644
--- a/frontend/components/dashboard/FutureForecastModalChart.tsx
+++ b/frontend/components/dashboard/FutureForecastModalChart.tsx
@@ -48,7 +48,7 @@ export function DailyTemperatureChart({
         label: locale === "en-US" ? "DEB baseline" : "DEB 原始路径",
         parsing: false,
         pointRadius: 0,
-        tension: 0.3,
+        tension: 0.1,
       });
 
       if (todayChartData.datasets.calibratedFutureSeries.length > 0) {
@@ -64,7 +64,7 @@ export function DailyTemperatureChart({
           parsing: false,
           pointHoverRadius: 5,
           pointRadius: 0,
-          tension: 0.32,
+          tension: 0.12,
         });
       }
 
@@ -81,7 +81,7 @@ export function DailyTemperatureChart({
           pointHoverRadius: 6,
           pointRadius: 0,
           spanGaps: true,
-          tension: 0.3,
+          tension: 0.1,
         });
       }
 
@@ -146,7 +146,7 @@ export function DailyTemperatureChart({
           label: locale === "en-US" ? "OM Raw" : "OM 原始",
           parsing: false,
           pointRadius: 0,
-          tension: 0.3,
+          tension: 0.1,
         });
       }
       if ((todayChartData.tafMarkers || []).length > 0) {
@@ -342,7 +342,7 @@ export function DailyTemperatureChart({
             label:
               locale === "en-US" ? "Open-Meteo Temperature" : "Open-Meteo 温度",
             pointRadius: 2,
-            tension: 0.28,
+            tension: 0.1,
           },
           {
             backgroundColor: "transparent",
@@ -352,7 +352,7 @@ export function DailyTemperatureChart({
             fill: false,
             label: locale === "en-US" ? "Dew Point" : "露点",
             pointRadius: 0,
-            tension: 0.24,
+            tension: 0.1,
           },
         ],
         labels,
diff --git a/frontend/components/dashboard/HistoryChart.tsx b/frontend/components/dashboard/HistoryChart.tsx
index 299ac512..81490acf 100644
--- a/frontend/components/dashboard/HistoryChart.tsx
+++ b/frontend/components/dashboard/HistoryChart.tsx
@@ -54,7 +54,7 @@ export function HistoryChart() {
         pointBorderColor: "#fff",
         pointHoverRadius: 7,
         pointRadius: 5,
-        tension: 0.2,
+        tension: 0.1,
       },
       {
         backgroundColor: "transparent",
@@ -65,7 +65,7 @@ export function HistoryChart() {
         label: locale === "en-US" ? "DEB Fusion" : "DEB 融合",
         pointHoverRadius: 6,
         pointRadius: 4,
-        tension: 0.2,
+        tension: 0.1,
       },
     ];
 
@@ -78,7 +78,7 @@ export function HistoryChart() {
         label: locale === "en-US" ? "MGM Official Forecast" : "MGM 官方预报",
         pointHoverRadius: 6,
         pointRadius: 4,
-        tension: 0.2,
+        tension: 0.1,
       });
     }
 
@@ -95,7 +95,7 @@ export function HistoryChart() {
             : `最佳单模型 (${summary.bestModelName})`,
         pointHoverRadius: 6,
         pointRadius: 4,
-        tension: 0.2,
+        tension: 0.1,
       });
     }
 
diff --git a/frontend/components/dashboard/ScanTerminalCard.module.css b/frontend/components/dashboard/ScanTerminalCard.module.css
index 401f2927..eda70000 100644
--- a/frontend/components/dashboard/ScanTerminalCard.module.css
+++ b/frontend/components/dashboard/ScanTerminalCard.module.css
@@ -1061,8 +1061,6 @@
 
 .root :global(.scan-ai-city-chart canvas) {
   display: block;
-  width: 100% !important;
-  height: 100% !important;
 }
 
 .root :global(.scan-ai-city-chart-placeholder) {
diff --git a/frontend/components/dashboard/scan-terminal/AiCityTemperatureChart.tsx b/frontend/components/dashboard/scan-terminal/AiCityTemperatureChart.tsx
index d4e05d4a..42c2d207 100644
--- a/frontend/components/dashboard/scan-terminal/AiCityTemperatureChart.tsx
+++ b/frontend/components/dashboard/scan-terminal/AiCityTemperatureChart.tsx
@@ -121,7 +121,7 @@ export const AiCityTemperatureChart = memo(function AiCityTemperatureChart({ det
             chartData.currentIndex != null && ctx.p0DataIndex < chartData.currentIndex ? [] : [6, 4],
         },
         spanGaps: true,
-        tension: 0.28,
+        tension: 0.1,
       },
     ];
 
@@ -135,7 +135,7 @@ export const AiCityTemperatureChart = memo(function AiCityTemperatureChart({ det
         pointHoverRadius: 5,
         pointRadius: 0,
         spanGaps: true,
-        tension: 0.32,
+        tension: 0.12,
       });
     }
 
diff --git a/frontend/lib/chart-utils.ts b/frontend/lib/chart-utils.ts
index a5732476..aa863c03 100644
--- a/frontend/lib/chart-utils.ts
+++ b/frontend/lib/chart-utils.ts
@@ -380,13 +380,22 @@ export function getTemperatureChartData(
   validEntries.forEach((entry) => {
     dataByHour.set(entry.tail, Number.isFinite(entry.value) ? entry.value : null);
   });
+  const getHourTemp = (h: number): number | null => {
+    const key = `${String(h).padStart(2, "0")}:00`;
+    return dataByHour.has(key) ? dataByHour.get(key)! : null;
+  };
   const times: string[] = [];
   const temps: Array<number | null> = [];
   for (let h = 0; h < 24; h++) {
     const hh = String(h).padStart(2, "0");
-    const key = `${hh}:00`;
-    times.push(key);
-    temps.push(dataByHour.has(key) ? dataByHour.get(key)! : null);
+    times.push(`${hh}:00`);
+    temps.push(getHourTemp(h));
+    if (h < 23) {
+      const a = getHourTemp(h);
+      const b = getHourTemp(h + 1);
+      times.push(`${hh}:30`);
+      temps.push(a != null && b != null ? Number((a + (b - a) * 0.5).toFixed(1)) : a ?? b);
+    }
   }
   const suppressAnkaraMgmObservation = isTurkishMgmCity(detail);