I can pull data for December (tomorrow), but in the the first two posts 
I've also posted excerpts from the db itself:

https://groups.google.com/g/weewx-user/c/rIbaSfEgpFs/m/_HcbPFtXAQAJ
2023-09-04 19:30:00        0.39999999  0.0        
2023-09-04 19:45:00        0.05866666  0.0        
2023-09-04 20:15:00        0.0         11.2       
2023-09-04 20:30:00        0.0         0.0        
2023-09-04 20:45:00        0.0         0.0    

https://groups.google.com/g/weewx-user/c/rIbaSfEgpFs/m/sUmMTLNXAQAJ
2023-09-16 09:45:00   1.00952380746438  8.4
2023-09-16 10:45:00   1.64067796275471  9.2
2023-09-16 11:00:00   0.42105263072000  0.0
[....]
2023-09-16 19:30:00   0.0               0.0
2023-09-16 19:45:00   0.0               0.0
2023-09-16 20:15:00   0.0               9.2
2023-09-16 20:30:00   0.0               0.0

Please notice in the last one how there's a sudden 9.2 value after hours of 
no rain, in my view it's those bogus values that are discarded by WU/PWS 
but they stay in the db.

On Sunday, January 7, 2024 at 5:32:31 PM UTC+2 Tom Keffer wrote:

> It's possible the errant values are in the daily summaries, but not the 
> main archive table. The former is used for the NOAA reports, the latter for 
> the WU posts.
>
> I don't know your timezone, but I imagine something like this:
>
> select dateTime, datetime(dateTime, 'unixepoch', 'localtime'), rain from 
> archive where dateTime > 1694822400 and dateTime <= 1694908800;
> select dateTime, datetime(dateTime, 'unixepoch', 'localtime'), sum from 
> archive_day_rain where dateTime > 1694822400 and dateTime <= 1694908800;
>
> -tk
>
> On Sat, Jan 6, 2024 at 6:32 PM Ξ <fcky...@gmail.com> wrote:
>
>> 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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