The error is now a bit different for me:
Weather-base water level encountered error:
Traceback (most recent call last):
File "/home/pi/OSPi/plugins/weather_level_adj.py", line 85, in run
history = history_info()
File "/home/pi/OSPi/plugins/weather_level_adj.py", line 317, in history_info
'rain_mm': float(day_info['precipm']),
ValueError: could not convert string to float: T