modified: app.py

modified:   static/css/style.css
	modified:   templates/weather.html

app.py

@@ -73,6 +73,20 @@ MOSMIX_PARAMS = [
     "hourly/large/uv_index",
 ]
 
+# ── Wetter-Icons (OpenWeatherMap CDN) ────────────────────────────────────────
+_OWM = "https://openweathermap.org/img/wn/"
+ICON_URLS = {
+    "☀️":  _OWM + "01d@2x.png",   # klar
+    "⛅":  _OWM + "02d@2x.png",   # leicht bewölkt
+    "☁️":  _OWM + "04d@2x.png",   # bedeckt
+    "🌧️": _OWM + "10d@2x.png",   # Regen
+    "🌦️": _OWM + "09d@2x.png",   # Regenschauer
+    "❄️":  _OWM + "13d@2x.png",   # Schnee
+}
+
+def _icon_url(emoji):
+    return ICON_URLS.get(str(emoji), _OWM + "03d@2x.png")
+
 def _get_berlin():
     try:
         import zoneinfo
@@ -341,41 +355,43 @@ def pick_daily_icon(hours):
     return "☀️"
 
 def feels_like(temp_c, wind_kmh, cloud_pct):
-    """Apparent temperature.
+    """Apparent / perceived temperature.
 
-    * Below 10 °C with wind > 4.8 km/h: Windchill (JAG/TI formula)
-    * Above 27 °C: Heat index (Rothfusz, assumed RH 60 %)
-    * Otherwise: actual temp ± sunshine/wind adjustments
-      - Wind cools by up to ~3 °C even in the mild range
-      - Sunshine (low clouds, no wind) warms by up to +4 °C
+    Uses the JAG/TI wind-chill formula blended smoothly across the full
+    temperature range so there is no abrupt jump at the old 10 °C threshold.
+    Above 27 °C the Rothfusz heat index (assumed RH 60 %) is applied.
+
+    The previous cloud-based sunshine bonus has been removed: cloud cover
+    fluctuates strongly hour to hour, which caused the felt temperature to
+    jump by several degrees without any real change in conditions.
     """
     if temp_c is None:
         return None
-    # ── Cold range: wind chill ────────────────────────────────────────
-    if temp_c <= 10 and wind_kmh is not None and wind_kmh > 4.8:
-        v = wind_kmh
-        wc = 13.12 + 0.6215*temp_c - 11.37*(v**0.16) + 0.3965*temp_c*(v**0.16)
-        return round(wc, 1)
-    # ── Hot range: heat index ─────────────────────────────────────────
+
+    # ── Hot range: heat index (Rothfusz, RH 60 %) ────────────────────
     if temp_c >= 27:
         rh = 60
-        hi = (-8.78469475556 + 1.61139411*temp_c + 2.33854883889*rh
-              - 0.14611605*temp_c*rh - 0.012308094*temp_c**2
-              - 0.016424828*rh**2 + 0.002211732*temp_c**2*rh
-              + 0.00072546*temp_c*rh**2 - 0.000003582*temp_c**2*rh**2)
+        hi = (-8.78469475556 + 1.61139411 * temp_c + 2.33854883889 * rh
+              - 0.14611605 * temp_c * rh - 0.012308094 * temp_c ** 2
+              - 0.016424828 * rh ** 2 + 0.002211732 * temp_c ** 2 * rh
+              + 0.00072546 * temp_c * rh ** 2
+              - 0.000003582 * temp_c ** 2 * rh ** 2)
         return round(hi, 1)
-    # ── Mild range: sunshine bonus + light wind cooling ───────────────
+
+    # ── Wind-chill (JAG/TI), blended into mild range ──────────────────
+    # Full wind-chill effect at ≤ 5 °C, linearly faded to zero at ≥ 20 °C.
+    # This avoids the hard jump that the old ≤ 10 °C threshold caused.
+    wind = wind_kmh or 0
     adjusted = float(temp_c)
-    # Sunshine bonus: clear sky (cloud_pct < 30) adds up to +4 °C
-    if cloud_pct is not None and cloud_pct < 30:
-        sunshine_bonus = (30 - cloud_pct) / 30 * 4.0
-        adjusted += sunshine_bonus
-    # Moderate wind cooling: >10 km/h removes up to 3 °C
-    if wind_kmh is not None and wind_kmh > 10:
-        wind_penalty = _clamp((wind_kmh - 10) / 40 * 3.0, 0, 3.0)
-        adjusted -= wind_penalty
+    if wind > 4.8:
+        wc = (13.12
+              + 0.6215 * temp_c
+              - 11.37 * (wind ** 0.16)
+              + 0.3965 * temp_c * (wind ** 0.16))
+        blend = _clamp((20.0 - temp_c) / 15.0, 0.0, 1.0)
+        adjusted = temp_c * (1.0 - blend) + wc * blend
+
     result = round(adjusted, 1)
-    # Only return a value if it meaningfully differs from actual temp
     return result if abs(result - temp_c) >= 0.5 else temp_c
 
 def get_sun_times(lat, lon, date=None):
@@ -747,6 +763,7 @@ def wetter():
         chart_precip=chart_precip, chart_rain_prob=chart_rain_prob,
         wind_dir_name=wind_direction_name,
         uv_risk_info=uv_risk_info,
+        icon_url=_icon_url,
     )
 
 @app.route("/api/suggest")