Tom and friends will know for sure, but I believe the low you are seeing (at 07:31) is from the archive_day_windchill table.

You likely have the following in your weewx.conf
    # Whether to include LOOP data in hi/low statistics
    loop_hilo = True

This tells weewx (well, it tells it to do exactly what the comment says).  Note: vantage loop packets do indeed include windchill.

The archive table (produced from vantage archive records) does not include this low and the graphs are produced from archive records.

I don’t think you are seeing anything *wrong*.

Note: these highs and lows in the daily stats get wiped out if you run wee_database —rebuild-daily (which is unfortunate).

On Dec 31, 2022, at 9:21 AM, Steve Schindler <schi...@gmail.com> wrote:

During the recent cold weather, I noticed a discrepancy between the windchill minimum value in the table and the value/time shown on the graph. For 12-24-22, the Low Wind Chill in the Since Midnight table is 23.6F at 07:31, but the graph doesn't reflect that value. It shows a low of about 27F at about 8:00. For 12-25-22, the temperature discrepancy is about the same but time difference is greater. See the screenshots below. All other values (temp, humidity, wind) agree between the table and the graphs.

I'm using a Davis VP2 with firmware version 1.82 so WeeWX is calculating the windchill value. 

Any thoughts on what's happening and how it can be corrected?

I'm in Florida so my troubleshooting/testing opportunities are limited to when a cold front passes through. However, I suspect that heat index has the same problem and, if so, I'll have plenty of time to work on that that this summer. :-)

12-24
<wx 2022-12-24 20:42:02.png>


12-25
<wx 2022-12-25 20:56:20.png>

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<wx 2022-12-25 20:56:20.png>
<wx 2022-12-24 20:42:02.png>

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