CLIMAT Data Format (FM-71)

Monthly Climatological Data

Table of Contents

• Monthly Climatological Data
  • 000 Group
  • 111 Group - General Monthly Data
  • 222 Group - Climatological Averages
  • 333 Group - Number of Days during Month Event Occurred
  • 444 Group - Extremes and Day it Occurred

Syntax

CLIMAT MMJJJ IIiii
111 1PPPP 2pppp 3sTTTsss 4sXXXsNNN 5eee 6RRRRdnn 7SSSppp 8ppttxx 9eerrss
222 0YYyy 1PPPP 2pppp 3sTTTsss 4sXXXsNNN 5eee 6RRRRnn 7SSS 8ppttxx 9eerrss
333 0TTtt 1TTtt 2TTtt 3RRrr 4RRrr 5RRrr 6SSss 7SSss 8FFffFF 9VVvvVV
444 0sXXXyy 1sNNNyy 2sXXXyy 3sNNNyy 4RRRRyy 5iFFFyy 6DDdd 7iGGgg

000 Group

• MM The month of the year.
  JJJ The last 3 digits of the year 1994=994
  
• IIiii The WMO number of the station.

111 Group - General Monthly Data

• 1PPPP The mean sea level pressure (.1mb)

• 2pppp The mean station pressure (.1mb)

• 3sTTT The mean temperature (.1C, - for S=1)
  sss The standard deviation (.1C)

• 4sXXX The maximum temperature (.1C, - for S=1)
  sNNN The minimum temperature (.1C, - for S=1)

• 5eee The mean vapor pressure (.1mb)

• 6RRRR The liquid precipitation (mm)
  d Comparison to normal

  0  less than any value in last 30 years
  1  in 1st quintile
  2  in 2nd quintile
  3  in 3rd quintile (roughly normal)
  4  in 4th quintile
  5  in 5th quintile
  6  greater than any value in last 30 years
  

  nn The number of days it measured >= 1 mm.

• 7SSS The number of hours of sunshine (hours)
  nnn Precent of normal

• 8ppttxx 9eerrss The number of missing observations in each group.

222 Group - Climatological Averages

• 0YYyy The start and end year.

• 1PPPP The mean sea level pressure (.1mb)

• 2pppp The mean station pressure (.1mb)

• 3sTTT The mean temperature (.1C, - for S=1)
  sss The standard deviation (.1C)

• 4sXXX The maximum temperature (.1C, - for S=1)
  sNNN The minimum temperature (.1C, - for S=1)

• 5eee The mean vapor pressure (.1mb)

• 6RRRR The liquid precipitation (mm)
  nn The number of days it measured >= 1 mm.

• 7SSS The number of hours of sunshine (hours)

• 8ppttxx 9eerrss The number of missing years in climatological mean for each group of data.

333 Group - Number of Days during Month Event Occurred

• 0TT The number of days temp >= 25C
  tt The number of days temp >= 30C

• 1TT The number of days temp >= 35C
  tt The number of days temp >= 40C

• 2TT The number of days T_min <= 0C
  tt The number of days T_max <= 0C

• 3RR The number of days prec >= 1mm
  rr The number of days prec >= 5mm

• 4RR The number of days prec >= 10mm
  rr The number of days prec >= 50mm

• 5RR The number of days prec >= 100mm
  rr The number of days prec >= 150mm

• 6SS The number of days snow >= 0cm
  ss The number of days snow >= 1cm

• 7SS The number of days snow >= 10cm
  ss The number of days snow >= 50cm

• 8FF The number of days wind speed >= 20knt
  ff The number of days wind speed >= 30knt
  FF The number of days wind speed >= 40knt

• 9VV The number of days visibility <= 50m
  vv The number of days visibility <= 100m
  VV The number of days visibility <= 1000m

444 Group - Extremes and Day it Occurred

• 0sXXX The maximum daily mean temp (.1C, - for S=1)
  yy The day which it occurred

• 1sNNN The minimum daily mean temp (.1C, - for S=1)
  yy The day which it occurred

• 2sXXX The maximum monthly temp (.1C, - for S=1)
  yy The day which it occurred

• 3sNNN The minimum monthly temp (.1C, - for S=1)
  yy The day which it occurred

• 4RRRR The maximum daily rainfall
  yy The day which it occurred

• 5i The wind type and unit:

  0  m/s  estimated
  1  m/s  anemometer
  2  knt  estimated
  3  knt  anemometer
  

  FFF The maximum wind speed (whole units)
  yy The day which it occurred

• 6DD The number of days with thunderstorms
  dd The number of days with hail/graupel