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CID category

#

Code

Index

Units

heat and cold


1

t

Monthly mean of daily mean temperature

°C

2

tn

Monthly mean of daily minimum temperature

°C

3

tx

Monthly mean of daily maximum temperature

°C

4

tnn

Monthly minimum of daily minimum temperature

°C

5

txx

Monthly maximum of daily maximum temperature

°C

6

tx35

Monthly count of days with maximum temperature above 35°C

1days

7

tx35ba

Monthly count of days with bias adjusted maximum temperature above 35°C

1days

8

tx40

Monthly count of days with maximum temperature above 40°C

1days

9

tx40ba

Monthly count of days with bias adjusted maximum temperature above 40°C

1days

10

fd

Monthly count of frost days

1days

11

hd

Annual heating degree-days

°C day

12

cd

Annual cooling degree-days

°C day

wet and dry


13

pr

Monthly mean of daily accumulated precipitation

mm

14

rx1day

Monthly maximum of 1-day accumulated precipitation

mm

15

rx5day

Monthly maximum of 5-day accumulated precipitation

mm

16

cdd

Annual consecutive dry days

days

17

spi6

Monthly Standardized Precipitation Index (SPI) for 6 months cumulation period

1

18*

spei6

Monthly Standardized Precipitation-Evapotranspiration Index (SPEI) for 6 months cumulation period

1

19*

huss

Monthly near surface specific humidity

1

20*

evspsbl

Monthly evaporation including sublimation and transpiration

mm

21*

mrsos

Monthly soil moisture in upper soil portion

kg m-2

22*

mrro

Monthly total runoff

kg m-2

snow and ice


23

prsn

Monthly mean of daily accumulated snowfall precipitation

mm

24

siconc

Monthly mean of sea-ice area percentage

%

wind and radiation

25

sfcwind

Monthly mean of daily mean wind speed

m s-1

26*

clt

Monthly fraction of cloud cover

%

27*

rsds

Monthly surface solar radiation downwards

W m-2

28*

rlds

Monthly surface thermal radiation downwards

W m-2

ocean

29

sst

Monthly mean of sea surface temperature

°C

circulation

30*

psl

Monthly sea level pressure

Pa

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