Procedure to Calculate Daily
and Monthly Totals
If at
least one hourly
total value is
missing, the daily
total is not
calculated and the sign of
missing data "-" is
entered in the table instead.
2. Daily totals
of global and
diffuse radiation are
determined in case
the data for all
hour intervals of
the daytime are available,
with the exception of sunrise and
sunset hour intervals.
To avoid
unduly great losses
of daily totals
due to the
gaps in the data for sunrise and
sunset hours, the following procedure of data processing
is accepted.
In case
observational data are
missing for the
above-mentioned hour intervals
on a number of
days, we recommend to determine hs (sun's
altitude) for those
hours.
If hs > 5°
, the lack
of an hourly
total is identified
as the lack
of observation, and
the daily total
is not determined for that day.
If hs £ 5° , the daily total is calculated in similar situation.
3. If data for each day of the month are available:
a) the
monthly total is
calculated by adding
together daily/hourly totals
for each day of the month;
b) the monthly
mean of daily/hourly totals
is calculated by dividing
the monthly total
by the number of
days in the calendar month.
4. If there are
days with missing
data, first of
all the monthly mean
of daily/ hourly totals
is calculated and
then monthly total is obtained:
a) the
monthly mean of
daily/hourly totals is
calculated by dividing
the sum of
daily/hourly totals for
the days with
available data (including
estimated and questionable
values) by the
number of days
with observations;
b) the
monthly total is calculated by multiplying the monthly mean
of daily/ hourly totals by the number of
days in the calendar month.
5. If there are
10 or more
days with missing
daily/hourly totals, the monthly
total and the
monthly mean of daily/ hourly totals
are not calculated
and "-" is
entered in respective columns.
6. If there are from 5 to 9
days with missing
daily/hourly totals, the
monthly total and
the monthly mean of
daily/hourly totals are enclosed in brackets.
7. If there are 5 or more
daily/hourly totals enclosed in brackets
(estimated or questionable), the
monthly totals and the monthly
mean of daily/hourly totals are enclosed in brackets.
8. If the number of days with missing daily/hourly totals and
daily/hourly totals in brackets
added together is
from 5 to 9, the monthly total and the monthly mean of daily/hourly totals are enclosed in
brackets, and if there are 10 or
more such days the
monthly total and the
monthly mean of daily/ hourly
totals are not calculated and
"- " is entered in
respective columns. All radiation
parameters and sunshine duration are subject to this rule.
9. The monthly means of daily totals of appropriate radiation
parameters from Tables I-III are also given in Tables IV-VI along with
monthly means of hourly totals, with the
exception of the cases when these values are absent in Table I-III. In such
situations the monthly means of daily totals are calculated by summing up the
monthly means of hourly totals for all hour intervals of the 24-hour period for
radiation balance and for all hour intervals of the daytime for global and
diffuse radiation.