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[[Category:Cumulus Files]]Please see [[Standard log files]], [[Extra Sensor Files]], [[Air_Link_Log.txt]], [[Month.ini]], or [[Monthlyalltime.ini]], as relevant.
Files are automatically created with names in the form <Month><Year>log.txt (for example, the file for August 2009 is called <tt>Aug09log.txt</tt>); 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”.
 
Please be aware that all of the above links lead to documentation about files that may be described as ''monthly log files'' when reading individual Cumulus forum and wiki references.
==Viewing monthly log files==
 
==Potential Name Confusion==
In the '''View''' menu, select ''Data logs'', click '''Load...''' and your data files will be listed. If there is a problem see [[FAQ#I_can.E2.80.99t_find_my_data_files.21|FAQ: I can't find my data files]]. Select the required monthly log and display it. 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.
 
Those who used early versions of Cumulus will remember that the term '''Log File''' was originally used for [[Log.xml]], but Steve Loft later accepted that all the files with a [[:Category:Ini Files|.ini]] file extension could be described as log files, so he introduced the term [[Weather Diary]]. A bit later, [[Standard log files| the detailed data file]], began to be also called '''log files''', and the confusion grew. When [[Extra Sensor Files]] were added, these also became '''log files'''. The Wiki page now called "Standard Log Files" was first called "Log files", then became "Monthly Log Files" because "Log files" became a category. Then "Extra Sensor Files" were added and "standard log files" replaced "Monthly Log Files" to make it clearer which file held the standard values, and which file held values for extra sensors.
==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).
 
Steve Loft wrote the Cumulus software mainly for his own use, although after a while he let others use it and added features that others requested. Cumulus was developed in his spare time outside a full-time employment, and consistency and terminology were not issues he worried about.
==How can Monthly log files be used within Cumulus?==
[[FAQ#How_do_I_correct_my_all-time_.28or_monthly.29_records.3F|See FAQ: How do I correct my all-time, annual, or monthly records]].
'''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. Click the ''Help'' button for detailed instructions on how all available monthly logs are used.
* (if the created/edited monthly log is within the current year) update the highs and lows in [[year.ini]] by choosing ''This year's records'' from the '''Edit''' menu. Click the ''Help'' button for detailed instructions on how all available monthly logs for the year are used.
* (if the created/edited monthly log is for the current month) update the highs and lows in [[month.ini]] by choosing ''This month's records'' from the '''Edit''' menu. Click the ''Help'' button for detailed instructions.
* (from version 1.9.3) update the highs and lows in [[monthlyalltime.ini]] by choosing ''Monthly records'' from the '''Edit''' menu. This is a text editor, and works best when at full screen. Click the ''Help'' button for detailed instructions on how all relevant monthly logs for all years are used.
'' '''Note''' in each of above,
#you see the currently stored extremes, and
#you can load the monthly log(s) and dayfile.txt to view extremes calculated from those figures (as available) and
#optionally '''Copy''' the logged values (and associated date/time information) into the relevant ini file.
Each of these is a text editor, and works best when at full screen.''
* see everything shown (but not stored in the .ini files used for tracking extremes) in '''View''' menu displays for ''This month'', ''This period'', and ''This year'' (e.g. '''[[Heat/cold_degree_days_and_Chill_hours | Air frosts]]''', '''[[Gale_Days |Gale days]]''', Total '''[[Windrun |Wind run]]''' figures are generated by reading the appropriate monthly log(s) and doing the necessary calculation).
* 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 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).
* 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 where some of the fields for a particular date are missing in the dayfile.txt (see [[Monthly_log_files#Using_Monthly_logs_to_deal_with_shorter_.28or_incomplete.29_dayfile.txt_records_for_particular_dates | workaround]] below).
 
During the development of the original Cumulus software (Cumulus 1 and 2) by Steve Loft, the name "monthly log" was most frequently used as a collective term for the last two (.ini) files linked above because those files tracked the monthly extreme records.
==Correcting any data problems==
[[FAQ#How_do_I_correct_my_all-time_.28or_monthly.29_records.3F|See FAQ: How do I correct my all-time, annual, or monthly records]].
 
When Steve Loft was working on his [[Cumulus_3_(MX)_beta_documentation|MX Beta]], he decided to implement within MX functionality the database schema that Mark Crossley had designed on [[ImportCumulusFile#Monthly_table_.28old.29|this]] page, where Mark selected the name '''Monthly''' for the table. David A Jamieson created versions 1.0 and 1.1 of ImportCumulusFile for creating a single table called '''dayfile''', but Mark extended it to cover ''realtime'' and what he called ''monthly log files''. That means the standard log can in MX optionally feed data into a database table called '''Monthly''' by default in MX.
===Editing within Cumulus===
You cannot edit any monthly log file within Cumulus.
 
This database table terminology can be misleading as ''that database table is not organised by month in any way'', a single table contains every logged line that has been inserted into it by Steve's '''ExportMySQL.exe''', Mark's '''ExportToMySQL.exe''', or by '''CumulusMX.exe''' itself. In fact MX allows you to give this table another name, which it will then use in all SQL.
===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.
 
Mark Crossley has taken over development of MX, the terminology "monthly log" is now being used for the first linked file (standard logs) instead of for '''month.ini''' the file that is truly logging monthly extremes. The name has been adopted simply because a new log file is started for each month.
'''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 CSV editor, or a spreadsheet program that can be instructed ''not'' to recognise special field (like date) types].
 
For novices, there can be a feeling of confusion:
'''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).
* The new practice leaves "month.ini" without a descriptive name
* Each "dayfile" line represents a new day so the filename matches the content, but a line in "Oct16log.txt" does not represent a month, and the file name does not contain the phrase "month"
* The names "Month.ini" and "Monthlyalltime.ini" do contain the phrase "month", they do contain monthly data in each line, and do log extreme records that clearly identify with a particular month
 
A future Wiki editor may decide on a different strategy, but at the moment the Cumulus Wiki has returned to the original Steve Loft terminology for each of the log files, for consistency with older articles in this Wiki, and the oldest posts on the forum.
'''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|Monthly log files: Example lines from the file]].
 
=Enhancement never implemented=
===Importing pre-Cumulus data===
See [[FAQ#I.E2.80.99ve_just_installed_Cumulus.2C_and_it_didn.E2.80.99t_download_all_the_old_data_from_my_weather_station|FAQ: I've just installed Cumulus and it didn't download all the old data from my weather station]]
 
Steve Loft was several times asked if he could change the design of his software and what it stored in [[Standard log files]], [[Extra Sensor Files]] and the other detailed logging files.
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 information from your weather station for a period before you first starting using Cumulus that you want to include.
 
All these files currently periodically store spot readings. Some of the competition in weather software, periodically store the highest and lowest since the previous line was stored.
There are some postings in the Support Forum about importing past data, and it is too wide a subject to fully cover here.
Essentially match the fields listed in [[Monthly_log_files#List_of_fields_in_the_file|Monthly log files: List of fields in the file]] below with the fields you have available in your source.
 
One advantage of the alternative approach is that you never lose any extremes. Another advantage is the alternative allows people to report extremes for parts of days. For example, some people wanted 9 am to 9 pm reported separately to night time extremes, in other nations, the dividing time was 3 pm not 9 pm.
'''There are some issues to consider.''' For example, 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), and 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.
 
Steve Loft would respond he had made many design decisions that were not ideal, but the software was based on his own needs. If people wanted drastic changes, they should do what he had done, and write software that did what suited them.
Cumulus has various wind speed, temperature, and rainfall related fields, not directly available from weather station outputs. See, for example ''EasyWeather'' differences in [[FAQ#What_do_the_various_wind_speeds_in_Cumulus_correspond_to.2C_with_Fine_Offset_stations.3F|FAQ: What do the various wind speeds in Cumulus correspond to with Fine Offset stations]] and other answers in the FAQ to pursue this; or add a post to the Support Forum for assistance. See the [[Monthly_log_files#Using_Monthly_logs_to_deal_with_shorter_.28or_incomplete.29_dayfile.txt_records_for_particular_dates | workaround]] described below for a way of getting Cumulus to generate (from your newly created monthly logs) apparent temperature, heat index, rain rate, wind run and other daily summary parameters that may not be available from your weather station.
 
Yet it appears he did plan to implement this suggestion in MX, see [[Cumulusmx.db#Releases 3.0.0 to 3.11.4 inclusive]].
'''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 in the various display options available from the Cumulus main screen. If you use the '''Edit''' functions to update the stored extremes as described above, any monthly logs found will be used, not just those after the initial Cumulus start date recorded in cumulus.ini, so the date will no longer reflect the start of analysis for all-time records. If you do choose to edit the start date, 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!
 
If you leave the start date unchanged note that <#recordsbegandate> is on the default Cumulus ''recordsT.htm'' template with the label "Records began on", and you might want to amend that label wording on that template to indicate it is the date that Cumulus running began, rather than the date the station began operating and producing observations.
 
===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==
 
* 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
* 08: Current rainfall rate
* 09: Total rainfall today so far
* 10: Current sea level pressure
* 11: Total rainfall counter
* 12: Inside temperature
* 13: Inside humidity
* 14: Current gust (i.e. 'Latest')
* 15: [[wind chill]]
* 16: [[Heat index]]
* 17: UV Index
* 18: Solar Radiation
Added in 1.9.1:
* 19: Evapotranspiration
* 20: Annual Evapotranspiration
* 21: [[Apparent temperature]]
* 22: Current theoretical max solar radiation
* 23: Hours of sunshine so far today
Added in 1.9.2:
* 24: Current Wind bearing
Added in 1.9.3:
* 25: RG-11 rain today
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
 
 
[[Category:Log Files]]
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