Update app.py

app.py

@@ -121,10 +121,21 @@ class TyphoonAnalyzer:
         print("Initial data loading complete")
 
     def fetch_oni_data_from_csv(self):
-        df = pd.read_csv(ONI_DATA_PATH)
-        df = df.melt(id_vars=['Year'], var_name='Month', value_name='ONI')
-        df['Date'] = pd.to_datetime(df['Year'].astype(str) + df['Month'], format='%Y%b')
-        return df.set_index('Date')
+       """Load ONI data from CSV"""
+       df = pd.read_csv(ONI_DATA_PATH)
+       df = df.melt(id_vars=['Year'], var_name='Month', value_name='ONI')
+       
+       # Convert month numbers to month names
+       month_map = {
+           '01': 'Jan', '02': 'Feb', '03': 'Mar', '04': 'Apr',
+           '05': 'May', '06': 'Jun', '07': 'Jul', '08': 'Aug',
+           '09': 'Sep', '10': 'Oct', '11': 'Nov', '12': 'Dec'
+       }
+       df['Month'] = df['Month'].map(month_map)
+       
+       # Now create the date
+       df['Date'] = pd.to_datetime(df['Year'].astype(str) + df['Month'], format='%Y%b')
+       return df.set_index('Date')
 
     def should_update_oni(self):
         today = datetime.now()