The information in this directory is weather information from the
weather station connected to the main building at the Wise Observatory
(the building of the 1m telescope).

From 2004 to October 2011 the information is in sub-directories which each 
is for one year and in each sub-directory there are daily weather logs. 
The format of these logs is explained here:

Table Description
=================
Field	Description		units
01	Universal time		days
02	Outside Temperature	Celsius
03	Inside Temperature	Celsius
04	Dew Temperature		Celsius
05	Outside Humidity	%
06	Inside Humidity		%
07	Barometric Pressure	mbar
08	Wind Speed		kph
09	Wind Direction		azimuth (degrees)



On October 2011 the weather station was changed to a new one (Vantage Pro) 
and the logs from the new station are in a different format. The files names 
have the format of data_yyyymmdd_yyyymmdd.txt where the first yyyymmdd is the 
starting date of the file and the second yyyymmdd is the end day of the file. 
The format in the files is different from the old files and there is a 
first line in each file to explain what is each column. These files are 
not created automatically but manually so the number of days in each file 
is arbitrary.


From the start of the new weather station (October 2011) up to local time
of 2015 July 23 at 14:13 the time written in the log files is Local Time 
minus 42 minutes (Time in the log = LT - 00:42, i.e, need to add 42
minutes to the time in the log in order to get the local time, or  
subtract from it 1 hour and 18 min in order to get the UT).
From local time of 2015 July 23 at 14:22 the time in the log
files is local time, i.e., UT + 2 hours (that is: need to subtract 2 
hours from the time in the log file to get the UT).
No daylight saving time is taken into account in these time stamps 
(so all local times above are winter times).

However, on 2016, August 15 I noticed the time is not the local winter time
but it was set to local summer time. So on 12:01 I changed it to 11:02 to 
correspond to the local winter time and not to local summer time. This means 
that somewhen between 2016, March 25 to August 15 the time was changed from 
local winter time to local summer time and this is not in correspondence with
the policy set in the previous paragraph, so I changed it back to local 
winter time on 2016, August 15 as noted above.

Also, on 2017, July 19 I noticed the time is not the local winter time
but it was set to local summer time. So on 16:52 I changed it to 15:52 to 
correspond to the local winter time and not to local summer time. This means 
that somewhen between 2017, March 25 to July 19 the time was changed from 
local winter time to local summer time and this is not in correspondence with
the policy set in the previous paragraph, so I changed it back to local 
winter time on 2017, July 19 as noted above.

On 2022, March 3, on 13:33 I noticed the time on the station is 12:33 which 
is not corresponding to the policy set above to be local winter time, 
so I set the time from 12:33 to 13:33. Do not know how long it has been 
with that one hour difference.

The time of the weather station program is not getting updated automatically
and I set it by hand every few months, so along time there is a drift 
in the time stamp which can be up to about 5 min (usually the drift is the 
the program time is slower than the real time).

On 2025, November 18, the time was corrected from 07:09 AM to 07:20 AM. 
This means that in the file data_20240819_20251118.txt it accumulated 11 min
delay during the period from 20240819 to 20251118.


From the start of the new weather station (October 2011) the barometric 
pressure is measured as follows: The Vantage Pro station measures atmospheric 
pressure. We enter the location's altitude in the software, so the Vantage
station calculates the necessary conversion factor to consistently translate 
atmospheric pressure to the corrected sea-level barometric pressure for 
display, and this is what displayed and is recorded by the station. 
One can fine-tune your barometric pressure reading by entering a new barometer 
reading in the set barometer dialog box - but we never did that calibration
since we never brought an accurate barometer to the site.


This directory is maintained by: Shai Kaspi - shai@wise.tau.ac.il