Fixes GH-192

bin/user/weewx_wdc.py

@@ -2045,12 +2045,14 @@ def get_windrose_data(self, start_ts, end_ts, context):
 
         # Calculate percentages.
         num_of_values = len(list(windSpeed_vt[0]))
-        for index, data in enumerate(windrose_data):
-            for p_index, percent in enumerate(data["r"]):
-                windrose_data[index]["r"][p_index] = round(
-                    # todo: division by zero
-                    (percent / num_of_values) * 100
-                )
+
+        if num_of_values > 0:
+            for index, data in enumerate(windrose_data):
+                for p_index, percent in enumerate(data["r"]):
+                    windrose_data[index]["r"][p_index] = round(
+                        # todo: division by zero
+                        (percent / num_of_values) * 100
+                    )
 
         return windrose_data
 

changelog.md

@@ -724,6 +724,7 @@ See https://github.com/Daveiano/weewx-wdc/compare/v3.2.0...11eed6b3#diff-ba225fb
 - Bugfix: Removed accidentally added Climatogram on year and stats page
 - Bugfix: Fixed encoding issue when using special chars in oridinate labels
 - Bugfix: Wind and Gust speed have a space between unit and comma (and added missing apostrophe to Yesterday's and Today's) GH-200
+- Bugfix: Division by zero in get_windrose_data GH-192
 - Added `show_min_max` configuration to gauges config, added ordinal display for windDir gauge min/max
 - Only show 3 decimals for the geocode provided by weewx-forecast GH-191
 - Make sidebar scrollable (if there are too many items) GH-193