Indices | Climdex

The Climdex project offers a range of climate extremes indices. These indices have a range of uses in different sectors.

Click on the index links in this table to find each index's definition

Index	Health	Agriculture and food security	Water resources and food security	Coasts	Disaster Risk Reduction	Energy	Fisheries	Forestry/GHGs	Cryosphere
FD Frost days	✅	✅			✅			✅	✅
TNlt2 TN below 2 °C		✅						✅	✅
TNltm2 TN below -2 °C		✅						✅	✅
TNltm20 TN below -20 °C		✅			✅			✅	✅
ID Ice Days		✅			✅			✅	✅
SU Summer days	✅				✅
TR Tropical nights	✅	✅			✅			✅
GSL Growing season length		✅			✅			✅
TXx Max TX		✅				✅		✅	✅
TNn Min TN		✅				✅		✅	✅
WSDI Warm spell duration indicator	✅	✅	✅	✅	✅	✅	✅	✅	✅
WSDId User-defined WSD	✅	✅	✅	✅	✅	✅	✅	✅	✅
CSDI Cold spell duration indicator	✅	✅		✅	✅	✅	✅	✅	✅
CSDId USer-defined CSD	✅	✅	✅	✅	✅	✅	✅	✅	✅
TXgt50p Fraction of days with above-median temperature	✅	✅	✅					✅
TX95t Very warm day threshold	✅	✅
TMge5 TM of at least 5 °C		✅						✅
TMlt5 TM below 5 °C		✅						✅
TMge10 TM of at least 10 °C		✅						✅
TMlt10 TM below 10 °C		✅						✅
TXge30 TX of at least 30 °C	✅	✅						✅
TXge35 TX of at least 35 °C	✅	✅			✅	✅		✅
TXdTNd User-defined consecutive number of hot days and nights	✅	✅	✅		✅			✅
HDDheatn Heating Degree Days	✅					✅
CDDcoldn Cooling Degree Days	✅					✅
GDDgrown Growing Degree Days	✅	✅						✅
CDD Consecutive Dry Days	✅	✅	✅		✅			✅
R20mm Number of very heavy rain days		✅	✅					✅
PRCPTOT Annual total wet-day PR		✅	✅					✅
R95pTOT Contribution from very wet days		✅	✅					✅
R99pTOT Contribution from extremely wet days		✅	✅					✅
RXdday User-defined consecutive days PR amount	✅	✅	✅		✅			✅
SPI Standardised Precipitation Index	✅	✅	✅		✅			✅
SPEI Standardised Precipitation Evapotranspiration Index	✅	✅	✅		✅			✅
TXbdTNbd User-defined consecutive number of cold days and nights	✅	✅	✅					✅
DTR Daily Temperature Range								✅
TNx Max TN									✅
TXn Min TX									✅
TMm Mean TM			✅						✅
TXm Mean TX			✅						✅
TNm Mean TN									✅
TX10p Amount of cool days						✅
TX90p Amount of hot days						✅
TN10p Amount of cold nights						✅
TN90p Amount of warm nights						✅
CWD Consecutive Wet Days				✅
R10mm Number of very heavy rain days				✅
Rnnmm Number of customised rain days				✅
SDII Daily PR intensity			✅					✅
R95p Total annual PR from heavy rain days				✅
R99p Total annual PR from very heavy rain days				✅
Rx1day Max 1-day PR		✅		✅	✅			✅
Rx5day Max 5-day PR		✅		✅	✅			✅
HWN (EHF/TX90/TN90) Heatwave number (HWN) as defined by either the Excess Heat Factor (EHF), 90th percentile of TX or the 90th percentile of TN	✅	✅	✅	✅	✅	✅	✅	✅	✅
HWF (EHF/TX90/TN90) Heatwave frequency (HWF) as defined by either the Excess Heat Factor (EHF), 90th percentile of TX or the 90th percentile of TN	✅	✅	✅	✅	✅	✅	✅	✅	✅
HWD (EHF/TX90/TN90) Heatwave duration (HWD) as defined by either the Excess Heat Factor (EHF), 90th percentile of TX or the 90th percentile of TN	✅	✅	✅	✅	✅	✅	✅	✅	✅
HWM (EHF/TX90/TN90) Heatwave magnitude (HWM) as defined by either the Excess Heat Factor (EHF), 90th percentile of TX or the 90th percentile of TN	✅	✅	✅	✅	✅	✅	✅	✅	✅
HWA (EHF/TX90/TN90) Heatwave amplitude (HWA) as defined by either the Excess Heat Factor (EHF), 90th percentile of TX or the 90th percentile of TN	✅	✅	✅	✅	✅	✅	✅	✅	✅
CWN (ECF) Coldwave number (CWN) as defined by the Excess Cold Factor (ECF)	✅	✅	✅	✅			✅	✅	✅
CWF (ECF) Coldwave frequency (CWF) as defined by the Excess Cold Factor (ECF)	✅	✅	✅	✅			✅	✅	✅
CWD (ECF) Coldwave duration (CWD) as defined by the Excess Cold Factor (ECF)	✅	✅	✅	✅			✅	✅	✅
CWM (ECF) Coldwave magnitude (CWM) as defined by the Excess Cold Factor (ECF)	✅	✅	✅	✅			✅	✅	✅
CWA (ECF) Coldwave amplitude (CWA) as defined by the Excess Cold Factor (ECF)	✅	✅	✅	✅			✅	✅	✅