See also: KNMI Climate Explorer ICA&D UERRA project
 
 

Daily data > Data dictionary > Elements

 
 

Elements

Different countries estimate daily average temperatures using different methods and formulae. Also, the time intervals for observing minimum and maximum temperature differ and the time interval for accumulating 24h rainfall differ. The table below describes the different "Ele ID" values available for each element in the database. These recording characteristics are included when downloading the daily data.

 

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Element

Ele ID

Description

Unit

MAXIMUM TEMPERATURE (TX)

 

TX1

Maximum temperature unknown interval

0.1 °C

 

TX2

Maximum temperature 18-18 UT

0.1 °C

 

TX3

Maximum temperature 0-0 UT

0.1 °C

 

TX5

Maximum temperature morning previous day 06,07,08 until morning today (shifted 1 day back by ECA staff)

0.1 °C

 

TX6

Maximum temperature morning today 06,07,08 until morning next day

0.1 °C

 

TX7

Maximum temperature between 06 and 18 UT today

0.1 °C

 

TX8

Maximum temperature 21-21 CET

0.1 °C

 

TX9

Maximum temperature morning previous day 09 h GMT until morning today (shifted 1 day back by ECA staff)

0.1 °C

 

TX10

Maximum temperature from 21:30 previous day until 21:30 CET

0.1 °C

 

TX11

Maximum temperature morning today 9 UTC until morning next day

0.1 °C

 

TX12

Maximum temperature 19-19 UTC

0.1 °C

 

TX13

Maximum temperature within 00-24, 12-12 or 06-06

0.1 °C

 

TX14

Maximum temperature 0-0 LT based on hourly intervals

0.1 °C

 

TX15

Maximum temperature 17-17 CET

0.1 °C

 

TX16

Maximum temperature 22-22 or 23-23 UT

0.1 °C

 

TX17

Maximum temperature 18-18 CET

0.1 °C

MINIMUM TEMPERATURE (TN)

 

TN1

Minimum temperature unknown interval

0.1 °C

 

TN2

Minimum temperature 18-18 UT

0.1 °C

 

TN3

Minimum temperature 0-0 UT

0.1 °C

 

TN5

Minimum temperature morning previous day 06,07,08 until morning day

0.1 °C

 

TN6

Minimum temperature between 18 UT previous day and 06 UT today

0.1 °C

 

TN8

Minimum temperature 21-21 CET

0.1 °C

 

TN9

Minimum temperature morning previous day 09 h GMT until morning today

0.1 °C

 

TN10

Minimum temperature from 21:30 previous day until 21:30 CET

0.1 °C

 

TN11

Minimum temperature 19-19 UTC

0.1 °C

 

TN12

Minimum temperature within 00-24, 12-12 or 18-18

0.1 °C

 

TN13

Minimum temperature 0-0 LT based on hourly intervals

0.1 °C

 

TN14

Minimum temperature 17-17 CET

0.1 °C

 

TN15

Minimum temperature 22-22 or 23-23 UT

0.1 °C

MEAN TEMPERATURE (TG)

 

TG1

Mean temperature unknown interval

0.1 °C

 

TG3

Mean temperature 0-0 UT

0.1 °C

 

TG5

Mean temperature calculated as average of TN and TX

0.1 °C

 

TG6

Mean temperature calculated as weighted average of TN, TX and observations at 06, 12 and 18 UT (5 values)

0.1 °C

 

TG7

Mean temperature calculated as average of 3 or more observations each day

0.1 °C

 

TG8

Mean temperature calculated as weighted average of 06, 13 and 20 (twice) UTC

0.1 °C

 

TG9

Mean temperature 06-06 UTC

0.1 °C

 

TG10

Mean temperature calculated as weighted average of 07:30, 14:30 and 21:30 (twice) CET

0.1 °C

 

TG11

Mean temperature 18-18 UT

0.1 °C

 

TG12

Mean temperature calculated as average of 00, 06, 12, 18 UTC

0.1 °C

 

TG13

Mean temperature calculated as average of 01, 07, 13 and 19 UT

0.1 °C

 

TG14

Mean temperature calculated as average of 07, 14, 21, 21 CET

0.1 °C

 

TG15

Mean temperature calculated as average of 8 observations

0.1 °C

 

TG16

Mean temperature calculated as average of 07, 14, 21 CET

0.1 °C

SUNSHINE (SS)

 

SS1

Daily sunshine

0.1 Hours

 

SS2

Daily sunshine, unknown interval

0.1 Hours

 

SS3

Daily sunshine, 0-0 UT

0.1 Hours

 

SS4

Daily sunshine 18-18 UT

0.1 Hours

 

SS5

Daily sunshine 21-21 CET

0.1 Hours

SNOW DEPTH (SD)

 

SD1

Mean daily snow depth, 0-0 UT

1 cm

 

SD2

Mean daily snow depth, unknown interval

1 cm

 

SD3

Snow depth at 6,7,8 am (local time)

1 cm

 

SD4

Snow depth at 07:30 CET

1 cm

 

SD5

Snow depth at 6 or 9 UTC

1 cm

 

SD6

Snow depth at 12 UTC

1 cm

 

SD7

Snow depth at 05:40 UTC

1 cm

PRECIPITATION AMOUNT (RR)

 

RR1

Precipitation amount unknown interval

0.1 mm

 

RR2

Precipitation amount morning previous day 06,07,08,09 until morning today (shifted 1 day back by ECA staff)

0.1 mm

 

RR3

Precipitation amount morning today 06,07,08 until morning next day

0.1 mm

 

RR4

Sum of 12-hourly precipitation of observations at 06 and 18 UT (2 values). Date of 18 UT

0.1 mm

 

RR5

Precipitation amount morning today 07:30 CET until morning next day

0.1 mm

 

RR6

Precipitation amount 18-18 UT (sum of 4 values)

0.1 mm

 

RR7

Precipitation amount 0 - 0 UT

0.1 mm

 

RR8

Sum of 12-hourly precipitation of observations at 18 UT today and 6 UT tomorrow (2 values)

0.1 mm

 

RR9

Precipitation amount morning today 06:00 UTC until morning next day

0.1 mm

 

RR10

Precipitation amount within 00-24, 07-07 or 08-08

0.1 mm

 

RR11

Precipitation amount morning today 05:40 UTC until morning following day

0.1 mm

 

RR12

Precipitation amount 12 UT yesterday until 12 UT today

0.1 mm

 

RR13

Precipitation amount 22-22 or 23-23 UT

0.1 mm

SEA LEVEL PRESSURE (PP)

 

PP1

Sea level pressure at 12 UT

0.1 hPa

 

PP2

Mean sea level pressure, 0-0 UT

0.1 hPa

 

PP3

Mean sea level pressure calculated as weighted average of observations at 00, 06, 12 and 18 UT (4 values)

0.1 hPa

 

PP4

Sea level pressure at 06 UT

0.1 hPa

 

PP5

Sea level pressure, mean of 13, 20 UT previous day and 7 UT current day (shifted 1 day back by ECA staff)

0.1 hPa

 

PP7

Mean sea level pressure calculated as weighted average of observations at 00, 07, 13 and 18 UT (4 values)

0.1 hPa

 

PP8

Mean sea level pressure unknown interval

0.1 hPa

 

PP9

Sea level pressure, mean of 06, 13 and 20 UTC of the current day

0.1 hPa

 

PP10

Sea level pressure, mean of 7:30, 14:30 and 21:30 CET

0.1 hPa

 

PP11

Sea level pressure, mean 18-18 UT

0.1 hPa

 

PP12

Sea level pressure, mean of 8:00 and 13:00 local time

0.1 hPa

 

PP13

Mean sea level pressure, 21-21 UTC (8 values)

0.1 hPa

 

PP14

Mean sea level pressure, 23-23 UTC (24 values)

0.1 hPa

 

PP15

Mean sea level pressure, mean of 7, 13, 20 UT current day

0.1 hPa

 

PP16

Mean sea level pressure, mean of daily minimum and maximum pressure

0.1 hPa

 

PP17

Mean sea level pressure, average of 7, 14 and 19 UT

0.1 hPa

 

PP18

Mean sea level pressure, average of 6, 12 and 18 UT

0.1 hPa

 

PP19

Mean sea level pressure calculated as average of 8 observations

0.1 hPa

 

PP20

Mean sea level pressure, mean of 7, 14, 21 UT current day

0.1 hPa

 

PP21

Mean sea level pressure calculated as average of observations at 07, 13 and 18 UT (3 values)

0.1 hPa

 

PP22

Sea level pressure at 9 AM LT

0.1 hPa

HUMIDITY (HU)

 

HU1

Relative humidity, mean of 0,7,13 18 UT current day

1 %

 

HU2

Relative humidity, unknown interval

1 %

 

HU3

Mean relative humidity, 0-0 UT

1 %

 

HU4

Relative humidity, average of 07:30, 14:30 and 21:30 CET

1 %

 

HU5

Relative humidity, mean of 7, 14 and 21 UTC

1 %

 

HU6

Relative humidity, mean 18-18 UT

1 %

 

HU7

Relative humidity, mean of 7, 14 and 21 CET

1 %

 

HU8

Relative humidity, 23-23 UTC (24 values)

1 %

 

HU9

Relative humidity, mean of 7, 14 and 19 UT

1 %

 

HU10

Relative humidity at 9.00 AM

1 %

 

HU11

Relative humidity at 21.00

1 %

 

HU12

Relative humidity at 9 AM LT calculated from dewpoint and air temperature

1 %

WIND GUST (FX)

 

FX1

Maximum 3 second wind gust, 0-0 UT

0.1 m/s

 

FX2

Maximum 2 second wind gust, 0-0 UT

0.1 m/s

 

FX3

Maximum 10 second wind gust, 18-18 UT

0.1 m/s

 

FX4

Maximum value of wind gust speeds 18 - 18 UT

0.1 m/s

 

FX5

Maximum 3 second wind gust, 18-18 UT

0.1 m/s

 

FX6

Average wind gust from 23 UT previous day - 22 UT today (24 values)

0.1 m/s

 

FX7

Maximum value of 15-min wind speed measurements, 0-0 LT

0.1 m/s

 

FX8

Maximum 3 second wind gust, 9-9 LT

0.1 m/s

WIND SPEED (FG)

 

FG1

Average wind speed of 24 hourly measurements of 10-min average (0-0 UT)

0.1 m/s

 

FG2

Average wind speed of measurements at 06, 12, 18, (00) UTC

0.1 m/s

 

FG3

Average wind speed of 3 measurements at 06.30, 13.30 and 20.30 UTC

0.1 m/s

 

FG4

Average wind speed, mean of 7, 14 and 21 CET

0.1 m/s

 

FG5

Average wind speed 18 - 18 UT, 8 3-hourly observations

0.1 m/s

 

FG6

Average wind speed, mean of 4 10-min averages of 00, 07, 13 and 18 UT

0.1 m/s

 

FG7

Average wind speed of 24 hourly measurements (6 10-min average per hour) 0-0 UT

0.1 m/s

 

FG8

Average 10-minute wind speed from 23 UT previous day - 22 UT today (24 values)

0.1 m/s

 

FG9

Average from 07h to 07h through a mechanical counter

0.1 m/s

 

FG10

Average wind speed of 24 hourly measurements of 15-min average (0-0 LT)

0.1 m/s

 

FG11

wind speed at 9 AM LT

0.1 m/s

WIND DIRECTION (DD)

 

DD1

Average vectorial wind direction calculated from 3 measurements at 06, 12 and 18 UTC.

degrees

 

DD2

Wind direction at time of maximum gust

degrees

 

DD3

Average vectorial wind-speed-weighted wind direction calculated from 3 measurements at 06.30, 13.30 and 20.30 UTC

degrees

 

DD4

Wind direction at 12 UTC

degrees

 

DD5

Average wind direction, mean of 00, 07, 13 and 18UT

degrees

 

DD6

Average vectorial 10-minutes wind direction, 0 - 0 UTC

degrees

 

DD7

Average vectorial 2-minute wind direction from 23 UT previous day - 22 UT today (24 values)

degrees

 

DD8

Wind direction at 14 LT

degrees

 

DD9

Wind direction at 9 AM LT

degrees

CLOUD COVER (CC)

 

CC1

Mean daily cloud cover, 0-0 UT

oktas

 

CC2

Mean daily cloud cover, mean of 7, 13, 18 UT current day

oktas

 

CC3

Mean daily cloud cover, unknown interval

oktas

 

CC4

Mean daily cloud cover, mean of 7, 13, 20 UT current day

oktas

 

CC5

Mean daily cloud cover, average of 07:30, 14:30 and 21:30 CET

oktas

 

CC6

Mean daily cloud cover, mean of 7, 14 and 21 UTC

oktas

 

CC7

Mean daily cloud cover, 18-18 UT

oktas

 

CC8

Mean daily cloud cover, average of 00, 13 and 18 UT

oktas

 

CC9

Mean daily cloud cover, average of 0, 6, 12 and 18 UTC

oktas

 

CC10

Mean daily cloud cover, 23-23 UTC (24 values)

oktas

 

CC11

Mean daily cloud cover, average of 3-hourly values, 0-0 UTC

oktas

 

CC12

Mean daily cloud cover, average of 7, 14 and 19 UT

oktas

 

CC13

Mean daily cloud cover, average of 6, 12 and 18 UTC

oktas

 

CC14

Mean daily cloud cover, mean of 7, 14, 21 CET

oktas

 

CC15

Mean daily cloud cover, mean of 8, 14 CET

oktas

 

CC16

Mean daily cloud cover, mean of 9, 15 CET

oktas