diff --git a/weather_report.py b/weather_report.py
index a4e7ab7..6148308 100644
--- a/weather_report.py
+++ b/weather_report.py
@@ -48,8 +48,8 @@ plt.rcParams.update({
 def last_month_range() -> tuple[datetime, datetime, str]:
     today = datetime.now(timezone.utc)
     first_of_this = today.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
-    end = first_of_this - timedelta(seconds=1)
-    start = end.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
+    start = (first_of_this - timedelta(days=1)).replace(day=1, hour=0, minute=0, second=0, microsecond=0)
+    end = first_of_this  # exklusives Ende: < Juni 1 = komplett Mai
     label = f"{MONTHS_DE[start.month - 1]} {start.year}"
     return start, end, label
 
@@ -121,7 +121,7 @@ def create_combined_chart(start: datetime, end: datetime, label: str) -> bytes:
     ax.fill_between(dates_mm, t_min, t_max, alpha=0.12, color="#888888")
     ax.set_title("Temperaturverlauf (Tages-Min / Tages-Max)", fontweight="bold", pad=10)
     ax.set_ylabel("Temperatur (°C)")
-    ax.set_xlim(start, end)
+    ax.set_xlim(start - timedelta(hours=12), end + timedelta(hours=12))
     ax.xaxis.set_major_formatter(mdates.DateFormatter("%d.%m."))
     ax.xaxis.set_major_locator(mdates.DayLocator(interval=3))
     plt.setp(ax.get_xticklabels(), rotation=0, ha="center")
@@ -132,7 +132,7 @@ def create_combined_chart(start: datetime, end: datetime, label: str) -> bytes:
     ax.plot(dates_h, temps, color="#2a7be0", linewidth=1.5, label="Stundenmittel")
     ax.set_title("Temperaturverlauf (Stundenmittel)", fontweight="bold", pad=10)
     ax.set_ylabel("Temperatur (°C)")
-    ax.set_xlim(start, end)
+    ax.set_xlim(start - timedelta(hours=12), end + timedelta(hours=12))
     ax.xaxis.set_major_formatter(mdates.DateFormatter("%d.%m."))
     ax.xaxis.set_major_locator(mdates.DayLocator(interval=3))
     plt.setp(ax.get_xticklabels(), rotation=0, ha="center")