Hello Tom,

I've posted above a link to the exact date I was comparing: 
https://www.wunderground.com/dashboard/pws/I5302/table/2023-09-16/2023-09-16/daily
 

You can see there on September 16, 2023 the total precipitation is 9.14 mm 
whereas WeeWx is showing "Today's Rain: 59,2mm"

Here's also the PWS link for the same date: 
https://www.pwsweather.com/station/pws/dolniokol?timespan=day&date=2023-09-16
It's showing a total of 9.1mm

If we look for the month of December:
PWS shows total of 41.7mm 
https://www.pwsweather.com/station/pws/dolniokol?timespan=month&date=2023-12-01
WU shows a total of 41.67mm 
https://www.wunderground.com/dashboard/pws/I5302/graph/2023-12-7/2023-12-7/monthly

However if I look at the weewx report it's over 100mm:

                   MONTHLY CLIMATOLOGICAL SUMMARY for Dec 2023
NAME: Dolni Okol                  
ELEV: 1010 meters    LAT: 42-29.40 N    LONG: 023-29.70 E


                   TEMPERATURE (C), RAIN (mm), WIND SPEED (m/s)

                                         HEAT   COOL         AVG
      MEAN                               DEG    DEG          WIND           
        DOM   
DAY   TEMP   HIGH   TIME    LOW   TIME   DAYS   DAYS   RAIN  SPEED   HIGH   
TIME    DIR   
----------------------------------------------------------------------------------------
 01    9.4   14.7  13:30   -1.1  00:18    8.6    0.0    0.0    0.6    6.6 
 11:58    326
 02    7.6   17.5  15:23    2.7  20:58   10.4    0.0    0.0    0.1    3.3 
 14:38    325
 03    4.9   12.0  00:26   -2.0  23:56   13.1    0.0   13.2    0.1    3.3 
 13:02     33
 04   -2.3   11.7  15:39   -6.3  07:48   20.3    0.0    0.0    0.0    2.3 
 03:53    117
 05   -0.8    1.4  14:51   -2.5  07:23   18.8    0.0    0.0    0.0    1.4 
 11:35    303
 06    0.7    1.3  14:03   -0.1  00:00   17.3    0.0    0.4    0.0    0.6 
 02:03    307
 07    0.3    3.7  11:02   -2.0  23:16   17.7    0.0    0.0    0.1    3.0 
 13:48     56
 08   -2.3   -0.9  13:18   -3.8  22:07   20.3    0.0    0.0    0.0    0.0 
 00:00     90
 09   -2.1    1.0  14:38   -4.4  05:04   20.1    0.0    0.0    0.0    0.9 
 14:42    161
 10   -0.8   10.6  15:17   -4.0  05:44   18.8    0.0    4.0    0.0    2.3 
 13:02    316
 11    0.3    7.2  14:56   -3.6  07:52   17.7    0.0    0.8    0.0    2.0 
 12:04    138
 12    3.8   13.6  15:35    0.1  21:58   14.2    0.0    0.8    0.0    3.0 
 05:10     14
 13    3.2   11.1  14:28    0.4  04:02   14.8    0.0    0.0    0.0    1.2 
 15:36    302
 14    5.7   11.7  10:36    0.6  02:20   12.3    0.0    7.2    0.1    3.1 
 04:20     41
 15    1.1    2.1  03:06   -0.7  23:56   16.9    0.0   42.0    0.0    2.8 
 05:17     56
 16   -2.0   -0.5  13:54   -3.7  23:59   20.0    0.0    0.0    0.0    0.0 
 00:00     90
 17   -5.7    0.5  13:58  -10.5  07:32   23.7    0.0    0.0    0.0    0.0 
 00:00     90
 18   -3.0    9.9  15:34   -8.1  01:40   21.0    0.0   18.8    0.0    0.0 
 00:00     90
 19   -0.9   12.1  15:20   -4.6  07:04   18.9    0.0    4.8    0.0    0.0 
 00:00     90
 20    1.4    9.2  15:04   -5.2  06:31   16.6    0.0    5.2    0.1    2.6 
 16:48    315
 21    1.0   10.6  15:13   -3.5  20:04   17.0    0.0    0.8    0.1    2.5 
 22:09     47
 22    1.9    3.7  03:57    0.1  23:01   16.1    0.0    4.0    0.2    4.4 
 00:41    320
 23    2.4    5.3  11:23   -0.5  17:43   15.6    0.0    0.8    0.3    4.5 
 21:58    348
 24    6.4   13.5  15:33    3.1  06:08   11.6    0.0    0.0    0.2    4.2 
 16:06    337
 25    8.7   17.6  15:33    2.6  23:45    9.3    0.0    0.0    0.2    3.2 
 14:08    331
 26    6.8   16.6  15:18   -0.3  05:13   11.2    0.0    0.0    0.1    2.2 
 09:18    330
 27    4.3   16.0  15:26   -1.4  23:57   13.7    0.0    0.0    0.0    2.8 
 01:21     51
 28    2.6   18.6  15:55   -2.7  07:19   15.4    0.0    0.0    0.1    2.3 
 14:41    169
 29    2.7   15.1  15:49   -2.0  05:40   15.3    0.0    0.0    0.0    2.0 
 13:05    162
 30    1.9    8.7  13:26   -2.4  04:34   16.1    0.0    0.0    0.1    2.7 
 14:40     35
 31    2.3   15.5  15:20   -1.2  08:30   15.7    0.0    0.0    0.0    1.8 
 11:30    177
----------------------------------------------------------------------------------------
       2.0   18.6     28  -10.5     17  498.6    0.0  102.8    0.1    6.6   
  01    342 

Even though I know nothing I have the gut feeling the WS6in1 driver for 
Bresser doesn't handle well buffered data or the station itself passes on 
buffered data wrongly (but in either case PWS and WU discard those values)?!

Also so sorry for the late reply here as well.

Thanks,
Ivo

On Thursday, September 21, 2023 at 2:45:20 AM UTC+3 Tom Keffer wrote:

No. That's not enough clues to narrow it down.

But, you say the "spike" is in the database, but not being uploaded to PWS 
or Wunderground? Can you post your station ID for either/both?

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