Indices data

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KNMI Climate Explorer

ICA&D

C3S2_311_Lot3

Indices of extremes > Indices data

Indices data

This is the download page for aggregated station indices data for all stations within ECA&D. Indices data are freely available for non-commercial research. For each station 76 indices are calculated, each describing changes in the mean or extremes of climate. 26 indices follow the definitions recommended by the CCl/CLIVAR/JCOMM Expert Team on Climate Change Detection and Indices (ETCCDI, marked with *). To learn more about the indices and the way they are calculated see the Indices dictionary.
The 76 indices have been grouped in different categories corresponding with different aspects of climate change.

There is one datafile for each index. Each datafile gives information for all available stations in the ECA&D database. The indices are aggregated over the year, the winter-half (ONDJFM), the summer-half (AMJJAS), winter (DJF), spring (MAM), summer (JJA), autumn (SON) and each of the calendar months. This readme file gives more information.

Cloudiness
Cold
Compound
Drought
Heat
Humidity
Pressure
Rain
Snow
Sunshine
Temperature

Cloudiness

Mean of daily mean cloud cover (CC)	Mostly sunny days (CC2)
Mostly cloudy days (CC6)

Cold

Growing degree days (GD4)	Growing season length (GSL)*
No. consecutive frost days (CFD)	No. frost days (FD)*
Heating degree days (HD17)	No. ice days (ID)*
Cold spell duration index (CSDI)*	No. of cold days (TG10p)
No. of cold nights (TN10p)*	No. of cold day-times (TX10p)*
Minimum of daily maximum temperature (TXn)*	Minimum of daily minimum temperature (TNn)*

Compound

No. of cold/dry days (CD)	No. of cold/wet days (CW)
No. of warm/dry days (WD)	No. of warm/wet days (WW)
Biologically Effective Degree Days (wine sector) (BEDD)	Heliothermal or Huglin Index (wine sector) (HI)
Universal Thermal Climate Index (UTCI)	Good tourism days (TCI >= 60) (TCI60)
Excellent tourism days (TCI >= 80) (TCI80)

Drought

Maximum no. of consecutive dry days (CDD)*	6-month Standardized Precipitation Index (SPI6)
Potential evapotranspiration (PET)	3-month Standardized Precipitation Index (SPI3)

Heat

No. of summer days (SU)*	No. tropical nights (TR)*
Warm spell duration index (WSDI)*	No. of warm days (TG90p)
No. of warm nights (TN90p)*	No. of warm day-times (TX90p)*
Maximum of daily maximum temperature (TXx)*	Maximum of daily minimum temperature (TNx)*
Consecutive summer days (CSU)

Humidity

Mean of daily mean relative humidity (RH)

Pressure

Mean of daily surface air pressure (PP)

Rain

Precipitation sum (RR)	No. of wet days (RR1)
Simple daily intensity index (SDII)*	Maximum no. of consecutive wet days (CWD)*
Heavy precipitation days (> 10mm) (R10mm)*	Very heavy precipitation days (> 20mm) (R20mm)*
Highest 1-day precipitation amount (RX1day)*	Highest 5-day precipitation amount (RX5day)*
No. of moderate wet days (R75p)	Precipitation fraction due to moderate wet days (R75pTOT)
No. of very wet days (R95p)	Precipitation fraction due to very wet days (R95pTOT)*
No. of extremely wet days (R99p)	Precipitation fraction due to extremely wet days (R99pTOT)*
Precipitation amount due to wet days (PRCPTOT)*

Snow

Mean of daily snow depth (SD)	No. of snow days (SD1)
No. of days with 5 cm of snow or more (SD5cm)	No. of days with 50 cm of snow or more (SD50cm)

Sunshine

Sunshine duration fraction (SSp)

Sunshine duration (SS)

Temperature

Mean of daily mean temperature (TG)	Mean of daily minimum temperature (TN)
Mean of daily maximum temperature (TX)	Mean of diurnal temperature range (DTR)*
Intra-period extreme temperature range (ETR)	Mean absolute day-to-day difference in DTR (vDTR)

Wind

Maximum value of daily maximum wind gust (FXx)	Days with FG >= 6 Bft (10.8 m/s) (FG6Bft)
Days with FG <= 2 m/s (calm days) (FGcalm)	Days with northerly winds (DDnorth)
Days with southerly winds (DDsouth)	Days with westerly winds (DDwest)
Days with easterly winds (DDeast)	Mean of daily mean wind speed (FG)