I was getting errors. Process of elimination showed it was the monthwindvec 
image causing them, though not the day, week or year versions of that 
images.

I suspect data is at the bottom of this, but what data? Nothing odd in 
archive.windGust or windGustDir.

This is the latest WeeWx running on a Debian 12 virtual machine, and the 
database has the extended schema.

Turning on debugging didn't bring any extra information.

Caught unrecoverable exception in generator 
'weewx.imagegenerator.ImageGenerator'
        ****  unsupported operand type(s) for -: 'float' and 'str'
        ****  Traceback (most recent call last):
        ****    File "/usr/share/weewx/weewx/xtypes.py", line 109, in 
get_series
        ****      return xtype.get_series(obs_type, timespan, db_manager, 
aggregate_type,
        ****             
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ****    File "/usr/share/weewx/weewx/xtypes.py", line 1040, in 
get_series
        ****      return ArchiveTable.get_series(obs_type, timespan, 
db_manager, aggregate_type,
        ****             
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ****    File "/usr/share/weewx/weewx/xtypes.py", line 210, in 
get_series
        ****      agg_vt = get_aggregate(obs_type, stamp, do_aggregate, 
db_manager,
        ****               
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ****    File "/usr/share/weewx/weewx/xtypes.py", line 136, in 
get_aggregate
        ****      return xtype.get_aggregate(obs_type, timespan, 
aggregate_type, db_manager,
        ****             
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        ****    File "/usr/share/weewx/weewx/xtypes.py", line 1168, in 
get_aggregate
        ****      xsum += mag * math.cos(math.radians(90.0 - direction))
        ****                                          ~~~~~^~~~~~~~~~~
        ****  TypeError: unsupported operand type(s) for -: 'float' and 
'str'
        ****
        ****  During handling of the above exception, another exception 
occurred:
        ****
        ****  Traceback (most recent call last):
        ****    File "/usr/share/weewx/weewx/reportengine.py", line 248, in 
run
        ****      obj.start()
        ****    File "/usr/share/weewx/weewx/reportengine.py", line 465, in 
start

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