Belchertown skin - wrong historical graphs when gaps in the data

[Christian Gloor]

Hello everyone,

First off, thank you and kudos to the developers of weewx and the Belcherton skin. I'm all too happy to have found a much better alternative to the terrible WeatherLink application that came with our station.

Now, the reports work great with the default configuration but I decided to add some graphs for the historical data. I imported previous years from Weatherlink into weewx and the data is there. Now, I have huge gaps due to the fact that the computer running Weatherlink was down for months at a time. It is not import problem.

This is correctly reported in the NOAA reports attached.
However, when following the examples for the year graphs from the Belchertown wiki, my graphs come out wrong. It doesn't matter where the gaps are in my data. For example, in 2018 I had two months of data in November and December, the graph will report the correct values but in the columns from January and February as shown here:

Here is the relevant section of graphs.conf.

# Global Chart Defaults

# These are fallback options that charts will use if an option is not defined.

aggregate_type = None

time_length = 90000 # Last 25 hours

type = line

colors = "#7cb5ec, #b2df8a, #f7a35c, #8c6bb1, #dd3497, #e4d354, #268bd2, #f45b5b, #6a3d9a, #33a02c"

tooltip_date_format = "LLL"

connectNulls = false

[History]

        Title = "Wakatobi Airport Historical data"

        show_button = true

        button_text = History

        type = spline

        time_length = year_specific

        aggregate_type = max

        aggregate_interval = 86400 # 1 Day

        gapsize = 86400000

        xAxis_groupby = month

        xAxis_categories = 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', Aug', 'Sep', 'Oct', 'Nov', 'Dec'

        [[chart1]]

           year_specific = 2021

           title = "Average Climatological values for 2021"

           [[[outTemp]]]

              name = Max Temperature

              zIndex = 2

              color = "#fc0404"

              [[[[marker]]]]

                 enabled = true

                 radius = 4

           [[[outTemp_min]]]

              name = Min Temperature

              observation_type = outTemp

              aggregate_type = min

              zIndex = 2

              color = "#173c6a"

              [[[[marker]]]]

                  enabled = true

                  radius = 4

           [[[rainTotal]]]

              name = Rain Total

              type = column

              yAxis = 1

              zIndex = 0

              color = "#438bd6"

        [[chart2]]

           year_specific = 2020

           title = "Average Climatological values for 2020"

           [[[outTemp]]]

              name = Max Temperature

              zIndex = 2

              color = "#fc0404"

              [[[[marker]]]]

                 enabled = true

                 radius = 4

           [[[outTemp_min]]]

              name = Min Temperature

              observation_type = outTemp

              aggregate_type = min

              zIndex = 2

              color = "#173c6a"

              [[[[marker]]]]

                  enabled = true

                  radius = 4

           [[[rainTotal]]]

              name = Rain Total

              type = column

              yAxis = 1

              zIndex = 0

        [[chart3]]

           year_specific = 2019

           title = "Average Climatological values for 2019"

           [[[outTemp]]]

              name = Max Temperature

              zIndex = 2

              color = "#fc0404"

              [[[[marker]]]]

                 enabled = true

                 radius = 4

           [[[outTemp_min]]]

              name = Min Temperature

              observation_type = outTemp

              aggregate_type = min

              zIndex = 2

              color = "#173c6a"

              [[[[marker]]]]

                  enabled = true

                  radius = 4

           [[[rainTotal]]]

              name = Rain Total

              type = column

              yAxis = 1

              zIndex = 0

        [[chart4]]

           year_specific = 2018

           title = "Average Climatological values for 2018"

           [[[outTemp]]]

              name = Max Temperature

              zIndex = 2

              color = "#fc0404"

              [[[[marker]]]]

                 enabled = true

                 radius = 4

           [[[outTemp_min]]]

              name = Min Temperature

              observation_type = outTemp

              aggregate_type = min

              zIndex = 2

              color = "#173c6a"

              [[[[marker]]]]

                  enabled = true

                  radius = 4

           [[[rainTotal]]]

              name = Rain Total

              type = column

              yAxis = 1

What am I missing?
I would expect all 4 graphs to show all the months from January to December on the X axis and display the values where they are.

Thank you in advance for your help.
Chris

[Christian Gloor]

Ah, I forgot.
I'm running weewx 4.5.1, with the Belchertown skin 1.2, on a Raspberry Pi 3B running Raspbian.

Cheres,

Chris