# [ncl-talk] Calculate Annual cycle from daily data

Sri Nandini snandini at marum.de
Tue Jun 13 07:35:08 MDT 2017

```Hello

Im using daily data (for evaporation) and would like to convert/calculate monthly values to plot my annual cycle.
The evaporation data is from 1979-2010 in daily format.
My script is:

; ==============================================================
; Open the file: Read only the user specified period first observations then model
; ==============================================================
;***********************************************************
; Read time and create required yyyyddd
;***********************************************************
time    = f->time                          ; time:units = "hours since 1-1-1 00:00:0.0"
TIME    = cd_calendar(time, 0)          ; type float
year    = toint( TIME(:,0) )
month   = toint( TIME(:,1) )
day     = toint( TIME(:,2) )
ddd     = day_of_year(year, month, day)
yyyyddd = year*1000 + ddd                                  ; needed for input
;***********************************************************
;***********************************************************
e0     =  short2flt( f->e(:,:,:) )    ; convert to float
printVarSummary( e0 )
;***********************************************************
; Compute daily climatology: raw and then 'smoothed'
;***********************************************************
EClmDay    = clmDayTLL(e0, yyyyddd)     ; daily climatology at each grid point
printVarSummary(EClmDay)
printVarSummary(EClmDay)                                ; (time, lat,lon)

and the output is:

Variable: e0
Type: float
Total Size: 233385984 bytes
58346496 values
Number of Dimensions: 3
Dimensions and sizes:    [time | 11688] x [latitude | 64] x [longitude | 78]
Coordinates:
time: [692520..973008]
latitude: [64..32.5]
longitude: [30..68.5]
Number Of Attributes: 7
units :    m of water equivalent
long_name :    Evaporation
standard_name :    lwe_thickness_of_water_evaporation_amount
_FillValue_original :    -32767
_FillValue :    -32767
missing_value_original :    -32767
missing_value :    -32767

Variable: EClmDay
Type: float
Total Size: 7308288 bytes
1827072 values
Number of Dimensions: 3
Dimensions and sizes:    [year_day | 366] x [latitude | 64] x [longitude | 78]
Coordinates:
year_day: [1..366]
latitude: [64..32.5]
longitude: [30..68.5]
Number Of Attributes: 4
long_name :    Daily Climatology: Evaporation
units :    m of water equivalent
information :    Raw daily averages across all years
smoothing :    None