Monthly log files

Files are automatically created with names in the form <Month><Year>log.txt (for example, the file for August 2009 is called Aug09log.txt); an entry is made to the current month's file every ten (default value; you can change this on the station settings screen) minutes, recording the current sensor values. The file is in comma-separated format with one line per entry. For more information on these files see in the Cumulus help file, in the section “Data log file format”.

Viewing monthly log files

In the View menu, select Data logs, click Load.... The standard Windows File Select dialogue is displayed. Select the required monthly log, click Open and you will see the contents in a neat table with column headings, rows striped, and the date/time on a lighter background. This is a text viewer, and works best when at full screen, but even then you are likely to need to scroll both horizontally and vertically to look at all the figures. If you click on an individual figure the cell will be highlighted, but you cannot edit the figures on a view screen.

If no logs seen, see FAQ: I can't find my data files. Also note, this Data logs viewer is only for viewing monthly log files (not any other files in the same data directory), the heading for those will always be shown at the top of the screen.

Viewing summary figures for a month

In the View menu, select This month, and a summary for the current calendar month will be calculated from the monthly log. Note that many parameters are different to those available as web tags.

To view for a different month (or if you use 9am/10am rollover, if current local time on the 1st day of a month is before rollover time so the log for the current calendar month has not been started), select the month and year required using the options at bottom left, click Update Display and the revised summary will be calculated. (Alternatively you can select This period and select a start date and end date then click Update Display to get the equivalent calculation for part of a month or any other period).

How can Monthly log files be used within Cumulus?

After you have edited (or created any missing) Monthly log files, you can:

update the highs and lows in Alltime.ini by choosing all time records from the Edit menu. See Alltimelog.txt for current and previous values.
update (if the created/edited monthly log is within the current year) the highs and lows in year.ini by choosing This year's records from the Edit menu.
update (if the created/edited monthly log is for the current month) the highs and lows in month.ini by choosing This month's records from the Edit menu. See Diags for current and previous values.
update (from version 1.9.3) the highs and lows in monthlyalltime.ini by choosing Monthly records from the Edit menu. Click the Help button for specific instructions on using Reset and the two Copy column header buttons in this Monthly Records (Highs and Lows) Editor to action all rows.

  Note in each of above 4 editing screens you can:

see the currently stored extremes, and optionally Reset (row by row) to pre-editing value and timestamp.
load the monthly log(s) and dayfile.txt to view extremes calculated from those figures (as available) and
optionally Copy (row by row) the logged values (and associated date/time information) into the relevant .ini file.
click the Help button for detailed instructions on using The Records (Highs and Lows) Editors.
store your revised figures by clicking OK (or abandon all your edits by clicking Cancel).

 (Each of these screens is a text editor, and works best when at full screen).

see Mean temperatures, Air frosts, Gale days, Rain days, Dry days, and Total Wind run using View menu displays for This month, This period, and This year (These figures are generated by reading the appropriate monthly log(s) and doing the necessary calculation, they are not stored anywhere nor available as webtags).
create the relevant monthly and/or annual NOAA style report by choosing NOAA Monthly Report or NOAA Annual Report from the View menu, then select the required period using the selectors, click the Update Display button to see various statistics (including mean temperature) calculated from processing the monthly log files, and finally press Save button to store the new or amended report. (Note: You can generate a NOAA report for a period without a monthly log, if data for that period is present on dayfile.txt. Generation of complete NOAA reports requires information in dayfile.txt, and the monthly logs for period in question).
obtain (by viewing the created/edited log file just before rollover time) figures needed for correcting rogue figures in dayfile.txt. See for example FAQ re correcting rainfall.
use create missing button in the dayfile.txt selection in the Edit menu; This is a text editor, and works best when at full screen. Cumulus will then look through all monthly log files and create approximate records for any missing dates in the dayfile if those dates have observations stored in the relevant monthly log. (It creates a file in the Cumulus folder called dayfileeditlog.txt which contains the entries it created). Click the Help button for more information. In past and current versions (including 1.9.3), create missing will not affect any records that are incomplete or contain some rogue values (see workaround below).

Correcting any logged data problems

You cannot edit any monthly log file within Cumulus.

Manipulation in Cumulus Toolbox

The add-on Cumulus Toolbox contains a file editor that can manipulate monthly log files using a display rather like this screen (in this figure it is actually dayfile.txt that is being edited.

Manipulation outside Cumulus

Any log files for previous months can be edited (outside Cumulus) with Cumulus running, and after editing them, you can do further fetch edits within Cumulus as described above. The current month log file can also be edited outside Cumulus, but you must stop Cumulus first.

Tips -- take a copy of the original log file before you work on it outside Cumulus (perhaps give the not to be touched copy a filename of "<Month><Year>log.csv").

Edit the original file using an editor that treats all fields as text [either any text editor, a Comma Separated Value editor, or a spreadsheet program that can be instructed not to recognise special field (like date) types].

Rules -- Each line must contain the fields in correct sequence (since new versions/builds can add to number of fields, Cumulus will accept lines of various lengths without the more recent fields at the end). Nulls ',,' are not allowed in the line, so if you do not know the value for a particular field within the line, then type in a zero or -999 (check the format and range of numbers allowed for particular fields).

Important:

The date format uses two digits for the year and should be treated as text. Do not edit this file using software (e.g. Excel) with default of recognising formats, as it is likely to change the dates to have four figure years, and then Cumulus will no longer be able to use the file.
Times in these files are in the form hh:mm using the 24 hour clock and local time (system time).
Note that the fields related to solar data will only contain valid data if your station has the appropriate sensor(s).
Apart from bearings (stored as integers), most value fields are in format x.y using your system decimal notation. See Monthly log files: Example lines from the file.

Importing pre-Cumulus data

See FAQ: I've just installed Cumulus and it didn't download all the old data from my weather station

Given that monthly log files are used as input for updating the all-time, all-monthly (from version 1.9.3), and this year record extremes, for creating missing dayfile.txt entries, and for creating NOAA style reports, you may have some observations from your weather station recorded manually or electronically for a period before you first starting using Cumulus and want to create new monthly logs to feed into Cumulus.

Here are some issues to consider. There are some postings in the Support Forum about importing past data. Essentially match the fields listed in Monthly log files: List of fields in the file below with the fields you have available in your source.

Wind directions might be reported as cardinal points (north, south etc) and need converting to bearings in (integer) degrees (spreadsheet packages provide look up functionality to do such conversions).
Dates and times might need some pre-processing (spreadsheet packages usually have ability to select part of a text string and to cocatenate a number of strings) to convert them to text in the formats mentioned above. (Note - it is crucial in a spreadsheet to treat the date as text; Do not let the spreadsheet recognise it as a date as it might change the format or store as a 'days since X' number).
Wind speed fields may not directly match to weather station outputs. See, for example EasyWeather differences in FAQ: Wind speeds in Cumulus with Fine Offset stations and FAQ: Wind speeds with Oregon Scientific and La Crosse stations to pursue this; or add a post to the Support Forum for assistance.
Temperature fields may not directly match to weather station outputs. Copy across the fields you can and set the others to -999.99 so they are obvious. See the workaround described below for a way of getting Cumulus to generate (from your newly created monthly logs) apparent temperature, wind chill and heat index to replace any -999.99 figures.
Rainfall fields may not directly match to weather station outputs. Rain rate in field 8 may be generated from the workaround if unavailable from your station. The daily total in field 9 is since rollover time, and available weather station outputs may need some processing in your spreadsheet to derive this. Some stations output a count of total rainfall, others the total annual rainfall, either of these may be used for field 11. Rainfall processing issues are frequently discussed in the Support Forum, so you may find the solution there or ask there for assistance.

The date that Cumulus first started tracking all-time records (<#recordsbegandate> see Webtags#Records), does not need to be updated for Cumulus to recognise earlier monthly log files in its data subfolder and to use any monthly logs found in the various View and Edit options available from the Cumulus main screen. As <#recordsbegandate> is on the default Cumulus recordsT.htm template with the label "Records began on", inserting pre-Cumulus data implies you might want to amend that label wording on that template to indicate it is the date that Cumulus was first operational, rather than the date of the earliest tracked highs and lows.

If you prefer to edit the start date and keep the recordsT.htm template label "Records began on" unchanged, the method is to stop Cumulus, and amend the StartDate= line in cumulus.ini within the main Cumulus folder before re-starting Cumulus, but (in case you make a mistake) back up everything first!

Using Monthly logs to deal with shorter (or incomplete) dayfile.txt records for particular dates

WORKAROUND if dates are present in monthly log and dayfile.txt but not all fields for that date exist in dayfile.txt

Example: records created by earlier version of Cumulus [to help you, the versions (not builds) at which fields were added are indicated below]. Second example: records imported prior to Cumulus processing them, so some calculated parameters (apparent temperature, heat index, rain rate, wind run) may not have been available from your weather station to insert in the log files.

One method is (not near rollover time) to (1) take a copy of dayfile.txt original as backup, (2) in original file delete any days with partial information (e.g. from Cumulus versions that created fewer fields), (3) use create missing in the dayfile.txt selection in the Edit menu option of Cumulus (note whilst datafile.txt normally calculates all parameters like minimums and maximums from very frequent samples of your weather station, the resolution of create missing is limited to the interval between logging records in the monthly log), (4) rename the amended dayfile.txt as dayfile(generated).txt, (5) create a new dayfile.txt and (6) use a text editor to merge the required fields from the new dayfile(generated).txt with all other fields from (with reading access only) the backup copy of the original file. (This method preserves the original as a backup so you can experiment with different merges and do some cross-checking).

List of fields in the file

(Note shows version for all changes since version 1.8.5)

00: Date in the form dd/mm/yy or dd-mm-yy
01: Current time
02: Current temperature
03: Current humidity
04: Current dewpoint
05: Current wind speed
06: Recent (10-min) high gust
07: Average wind bearing (integer degrees)
08: Current rainfall rate
09: Total rainfall today so far (i.e. resets to zero at rollover)
10: Current sea level pressure
11: Total rainfall counter (content depends on weather station type, might be rainfall total so far this year)
12: Inside temperature
13: Inside humidity
14: Current gust (i.e. 'Latest')
15: wind chill(content depends on weather station type and Cumulus station settings)
16: Heat index
17: UV Index (only valid if output by weather station)
18: Solar Radiation (only valid if solar sensor on weather station)

Added in 1.9.1:

19: Evapotranspiration (only valid if output by weather station)
20: Annual Evapotranspiration (only valid if ET sensor on weather station)
21: Apparent temperature
22: Current theoretical max solar radiation (only valid if solar sensor on weather station)
23: Hours of sunshine so far today (only valid if solar sensor on weather station)

Added in 1.9.2:

24: Current Wind bearing (See 7)

Added in 1.9.3:

25: RG-11 rain today (only valid if output by sensor)

Added in 1.9.4 beta:

26: Total Rainfall since midnight

Example lines from the file

Note that your field delimiters may be different, and your date delimiter too.

An extract of a few lines of the file (v.1.9.0)

Here logging is quarter hourly, the field delimiter is a semicolon, the decimal separator is a comma, and the date separator a dash.

30-09-10;19:00;16,4;94;15,4;5,2;13,3;17;3,6;21,0;995,3;47,7;25,6;62;6,1;16,4;16,4;0,0;0 
30-09-10;19:15;16,4;94;15,4;5,6;11,2;12;18,0;24,0;995,0;50,7;25,6;62;7,2;16,4;16,4;0,0;0
30-09-10;19:30;16,2;94;15,2;7,9;15,8;355;7,2;25,8;994,3;52,5;25,7;62;12,2;16,2;16,2;0,0;0
30-09-10;19:45;16,0;94;15,0;9,9;19,4;7;7,2;27,9;993,3;54,6;25,7;62;14,8;15,8;16,0;0,0;0
30-09-10;20:00;15,9;94;14,9;12,4;20,9;354;7,2;30,0;993,0;56,7;25,7;62;19,4;15,4;15,9;0,0;0
30-09-10;20:15;15,8;94;14,8;8,4;15,8;349;14,4;32,7;993,4;59,4;25,8;61;12,2;15,8;15,8;0,0;0
30-09-10;20:30;15,4;94;14,4;13,8;33,1;317;28,8;40,5;993,7;67,2;25,8;61;23,4;14,7;15,4;0,0;0
30-09-10;20:45;15,1;94;14,1;20,3;34,2;356;7,2;43,8;992,3;70,5;25,8;60;29,5;13,8;15,1;0,0;0
30-09-10;21:00;15,3;94;14,3;20,2;35,6;358;10,8;46,8;991,0;73,5;25,8;60;28,1;14,0;15,3;0,0;0
30-09-10;21:15;15,3;95;14,5;16,6;31,7;358;10,8;49,5;991,4;76,2;25,8;60;20,9;14,3;15,3;0,0;0
30-09-10;21:30;15,3;94;14,3;14,0;27,0;324;18,0;54,3;992,3;81,0;25,8;60;15,8;14,5;15,3;0,0;0
30-09-10;21:45;15,2;94;14,2;13,0;25,6;323;10,8;57,9;992,3;84,6;25,8;59;24,5;14,5;15,2;0,0;0
30-09-10;22:00;15,0;94;14,0;16,7;31,7;312;10,8;60,6;993,0;87,3;25,8;59;23,4;13,9;15,0;0,0;0
30-09-10;22:15;14,9;94;13,9;16,0;30,6;357;10,8;63,0;991,6;89,7;25,8;59;20,9;13,9;14,9;0,0;0
30-09-10;22:30;14,9;94;13,9;17,6;31,7;3;3,6;63,3;990,6;90,0;25,8;59;19,4;13,7;14,9;0,0;0

this is an example of a file from 1.9.1, with solar data:

Here logging is increased to every five minutes, and using UK settings, the field delimiter is a comma, the decimal separator is a full stop, and the date separator a slash.

22/04/11,10:25,8.1,96,7.5,13,20,138,0.0,0.0,1013.24,215.2,20.3,53,17,4.8,8.1,0.0,197,0.08,171.88,3.4,663,0.0
22/04/11,10:30,8.1,96,7.5,13,20,142,0.0,0.0,1013.28,215.2,20.2,53,11,4.8,8.1,0.0,216,0.08,171.88,3.3,673,0.0
22/04/11,10:35,8.1,96,7.5,12,18,142,0.0,0.0,1013.31,215.2,20.2,53,11,5.1,8.1,0.0,227,0.08,171.88,3.8,682,0.0

and from version 1.9.2:

Here logging is at the default interval, and the delimiters have their default settings for UK systems.

01/10/11,04:40,18.0,75,13.5,5.0,6.7,169,0.0,0.0,1021.4,885.3,24.4,61,5.6,18.0,18.0,0.0,0,0.00,0.00,17.5,0,0.0,158
01/10/11,04:50,17.9,75,13.4,4.5,9.5,169,0.0,0.0,1021.4,885.3,24.4,61,2.0,17.9,17.9,0.0,0,0.00,0.00,17.5,0,0.0,180
01/10/11,05:00,17.8,75,13.3,5.1,9.5,177,0.0,0.0,1021.2,885.3,24.4,61,7.5,17.8,17.8,0.0,0,0.00,0.00,17.2,0,0.0,180