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CDD

Maximum number of consecutive dry days
(Drought spell)

Drought monitoring, drought damage indicator

CFD

Maximum number of consecutive frost days
(Cold spell)

General frost damage indicator

CSDI

Cold-spell duration index

Provides information on reduced
blossom formation or reduced growth

WSDI

Warm-spell duration index

Provide an indication concerning the occurrence of heat stress on reduced
blossom formation or reduced growth.

CSU

Maximum number of consecutive summer days
(Hot spell)

Provides information on
heat stress or on optimal growth for C4
crops (e.g. maize)

CWD

Maximum number of consecutive
wet days (Wet spell)

Provides information on drought/oxygen
stress/ crop growth (i.e. less radiation interception during rainy days)

WW

Warm and wet days

Provide an indication of occurrence of various pests insects and especially fungi Provides an indication concerning the crop development, especially leave
formation.

DTR

Mean of diurnal temperature range

Provides information on climate variability and change. Also serves as the proxy for information on the clarity
(transmittance) of the atmosphere

BEDD*)

Biologically Effective Degree Days

Determines crop development stages/rates. Crop development will decelerate/accelerate below and above
certain threshold temperatures.

GSL

Growing Season Length

Provides an indication whether a crop or a combination of crops can be sown and subsequently reach maturity within a
certain time frame

FD

Frost Days

Provides information on frost damage

ID

Ice Days

Provides information on frost damage

R10mm

Heavy precipitation days

Provides information on crop damage
and runoff losses

R20mm

Very heavy precipitation days

Provides information on crop damage
and runoff losses

RR

Precipitation sum

Provides information on possible water
shortage or excess.

RR1

Wet Days

Provides information on intercepted
reduction

SDII

Simple daily intensity index

Provides information on possible run off
losses.

SU*)

Summer days

Provide an indication concerning the occurrence of heat stress. Also base for crop specific variants for heat/cold stress (above/below the crop specific
optimal temperature thresholds)

TG

Mean of daily mean temperature

Provides information on long-term
climate variability and change

TN

Mean of daily minimum temperature

Provides information on long-term
climate variability and change

TNn

Minimum value of the daily minimum
Temperature

Provides information on long-term
climate variability and change

TNx

Maximum value of the daily
minimum temperature

Provides information on long-term
climate variability and change

TR

Tropical nights

Provide an indication of occurrence of various pests.

TX

Mean of daily maximum temperature

Provides information on long-term
climate variability and change

TXn

Minimum value of daily maximum
temperature

Provides information on long-term
climate variability and change

TXx

Maximum value of daily maximum
temperature

Provides information on long-term
climate variability and change