How to aggregate by calendar month

Karen K

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Nov 29, 2020, 1:10:02 PM11/29/20

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To create a diagramm I have to set a value for "aggregate_interval" in seconds. That works fine for days and weeks, as they are always the same length in seconds. In contrast, months have a variable length of 28, 30, or 31 days. Even 29 days are possible sometimes. So, is there a possibility to aggregate by calendar month?

And then, it is not sure, that the aggregation interval starts at the beginning of a month.

Is there any possibility to force that?

Example:

[[[yearhilowmonth]]]

time_length = 31536000 # 365 days

aggregate_interval = 2629800 # month?

line_gap_fraction = None
[[[[hi]]]]
data_type = outTemp
aggregate_type = max
label = month max
[[[[low]]]]
data_type = outTemp
aggregate_type = min
label = min
[[[[avg]]]]
data_type = outTemp
aggregate_type = avg
label = average temperature

Tom Keffer

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Nov 29, 2020, 9:33:06 PM11/29/20

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An aggregate_interval of 365.25 / 12 * 24 * 3600 = 2629800 is a "magic number" and recognized by WeeWX as a nominal month.

The example you gave should get you what you want: monthly highs, lows, and averages.

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Karen K

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Nov 30, 2020, 6:24:51 AM11/30/20

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Ah, so there is a special hack included for that problem.

Thank you for explaining.

Tom Keffer

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Nov 30, 2020, 8:08:27 AM11/30/20

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Incidentally, if you order your lines low/avg/high, you can use a bar chart, which will be easier to read.

[[[yearhilowmonth]]]
time_length = 31536000 # 365 days
aggregate_interval = 2629800# month?
line_gap_fraction = None

plot_type = bar

[[[[low]]]]
data_type = outTemp
aggregate_type = min
label = min
[[[[avg]]]]
data_type = outTemp
aggregate_type = avg
label = average temperature
[[[[hi]]]]
data_type = outTemp
aggregate_type = max
label = month max

-tk

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