diff --git a/index.html b/index.html
index f4c8a5b..5c0a2ca 100644
--- a/index.html
+++ b/index.html
@@ -735,10 +735,139 @@
 
         var startTime = Date.now();
 
+var weatherThemes = {
+            sunny: {
+                skyColor: 0x54514f,
+                cloudColor: 0xb0a89a,
+                cloudShadowColor: 0x6d6a63,
+                sunColor: 0xf3ede1,
+                sunGlareColor: 0xe0914f,
+                sunlightColor: 0xe6dfd1,
+                backgroundColor: 0x54514f,
+                speed: 0.4
+            },
+            cloudy: {
+                skyColor: 0x6d6a63,
+                cloudColor: 0x999187,
+                cloudShadowColor: 0x54514f,
+                sunColor: 0xe6dfd1,
+                sunGlareColor: 0xb0a89a,
+                sunlightColor: 0xb0a89a,
+                backgroundColor: 0x3a383d,
+                speed: 0.5
+            },
+            stormy: {
+                skyColor: 0x29282c,
+                cloudColor: 0x3a383d,
+                cloudShadowColor: 0x1c1b1f,
+                sunColor: 0x999187,
+                sunGlareColor: 0x6d6a63,
+                sunlightColor: 0x6d6a63,
+                backgroundColor: 0x100f12,
+                speed: 1.2
+            },
+            night: {
+                skyColor: 0x100f12,
+                cloudColor: 0x29282c,
+                cloudShadowColor: 0x1c1b1f,
+                sunColor: 0xb0a89a,
+                sunGlareColor: 0x54514f,
+                sunlightColor: 0x6d6a63,
+                backgroundColor: 0x100f12,
+                speed: 0.2
+            }
+        };
+
+        function getWeatherThemeName(code) {
+            if (code === 0) return 'sunny';
+            if (code >= 1 && code <= 3) return 'cloudy';
+            if (code >= 45 && code <= 48) return 'cloudy';
+            if ((code >= 51 && code <= 67) || (code >= 80 && code <= 82) || (code >= 71 && code <= 77) || (code >= 85 && code <= 86)) return 'stormy';
+            if (code >= 95) return 'stormy';
+            return 'cloudy';
+        }
+
+        function mixColor(color1, color2, factor) {
+            if (color1 === undefined || color2 === undefined) return color1 || color2;
+            var r1 = (color1 >> 16) & 255;
+            var g1 = (color1 >> 8) & 255;
+            var b1 = color1 & 255;
+            var r2 = (color2 >> 16) & 255;
+            var g2 = (color2 >> 8) & 255;
+            var b2 = color2 & 255;
+            var r = Math.round(r1 + (r2 - r1) * factor);
+            var g = Math.round(g1 + (g2 - g1) * factor);
+            var b = Math.round(b1 + (b2 - b1) * factor);
+            return (r << 16) | (g << 8) | b;
+        }
+
+        var prevThemeColors = null;
+        var targetThemeColors = null;
+        var transitionStartTime = 0;
+        var TRANSITION_DURATION = 5 * 60 * 1000;
+        var currentWeatherThemeName = null;
+        var currentThemeSpeed = 0.4;
+
+        function setWeatherTheme(themeName) {
+            if (currentWeatherThemeName !== themeName) {
+                prevThemeColors = getEffectiveThemeColors();
+                targetThemeColors = weatherThemes[themeName] || weatherThemes.cloudy;
+                transitionStartTime = Date.now();
+                currentWeatherThemeName = themeName;
+            }
+        }
+
+        function getEffectiveThemeColors() {
+            if (!targetThemeColors) return null;
+
+            var elapsed = Date.now() - transitionStartTime;
+            var smoothT;
+            if (!prevThemeColors || elapsed >= TRANSITION_DURATION) {
+                smoothT = 1;
+            } else {
+                var t = elapsed / TRANSITION_DURATION;
+                smoothT = t * t * (3 - 2 * t);
+            }
+
+            var result = {};
+            var keys = ['skyColor', 'cloudColor', 'cloudShadowColor', 'sunColor', 'sunGlareColor', 'sunlightColor', 'backgroundColor'];
+            for (var i = 0; i < keys.length; i++) {
+                var k = keys[i];
+                if (prevThemeColors && smoothT < 1) {
+                    result[k] = mixColor(prevThemeColors[k], targetThemeColors[k], smoothT);
+                } else {
+                    result[k] = targetThemeColors[k];
+                }
+            }
+            if (smoothT >= 1 && prevThemeColors !== targetThemeColors) {
+                prevThemeColors = targetThemeColors;
+                currentThemeSpeed = targetThemeColors.speed;
+            }
+            return result;
+        }
+
+        function applyWeatherTheme(c) {
+            var themeColors = getEffectiveThemeColors();
+            if (!themeColors) return c;
+
+            var mix = 0.6;
+            return {
+                sky: mixColor(c.sky, themeColors.skyColor, mix),
+                cloud: mixColor(c.cloud, themeColors.cloudColor, mix),
+                cloudShadow: mixColor(c.cloudShadow, themeColors.cloudShadowColor, mix),
+                sun: mixColor(c.sun, themeColors.sunColor, mix * 0.5),
+                sunGlare: mixColor(c.sunGlare, themeColors.sunGlareColor, mix * 0.5),
+                sunLight: mixColor(c.sunLight, themeColors.sunlightColor, mix * 0.5),
+                bg: mixColor(c.bg, themeColors.backgroundColor, mix),
+                sunVis: c.sunVis
+            };
+        }
+
         function animate() {
             var elapsed = (Date.now() - startTime) % CYCLE;
             var t = elapsed / CYCLE;
             var c = getColor(t);
+            c = applyWeatherTheme(c);
             effect.setOptions({
                 skyColor: c.sky,
                 cloudColor: c.cloud,
@@ -746,7 +875,8 @@
                 sunColor: c.sun,
                 sunGlareColor: c.sunGlare,
                 sunlightColor: c.sunLight,
-                backgroundColor: c.bg
+                backgroundColor: c.bg,
+                speed: currentThemeSpeed
             });
             document.body.style.backgroundColor = '#' + ('00000' + c.bg.toString(16)).slice(-6);
             requestAnimationFrame(animate);
@@ -849,6 +979,7 @@
                 .then(function(data) {
                     weatherData = data;
                     currentWeatherCode = data.current.weather_code;
+                    setWeatherTheme(getWeatherThemeName(currentWeatherCode));
                     updateWeatherDisplay();
                 })
                 .catch(function(err) {