Changes in Climate Extremes over North Thailand, 1960–2099

Table 2

Definition of extreme temperature and rainfall indices used in this study.

ID	Indicator name	Definition	Unit
Temperature indices
SU	Summer days	Annual count when daily max temperature (TX) > 35°C	Days
TR	Tropical nights	Annual count when daily minitemperature (TN) > 25°C	Days
TXx	Hottest day	Monthly maximum value of daily max temperature	°C
TNx	Warmest night	Monthly maximum value of daily min temperature	°C
TXn	Coldest day	Monthly minimum value of daily max temperature	°C
TNn	Coldest night	Monthly minimum value of daily min temperature	°C
TN10p	Cool nights	Percentage of days when TN < 10th percentile	Days
TX10p	Cool days	Percentage of days when TX < 10th percentile	Days
TN90p	Warm nights	Percentage of days when TN > 90th percentile	Days
TX90p	Warm days	Percentage of days when TX > 90th percentile	Days
DTR	Diurnal temp range	Monthly mean difference between TX and TN	°C
WSDI	Warm spell duration index	Annual count of days with at least 6 consecutive days when TX > 90th percentile	Days
CSDI	Cold spell duration index	Annual count of days with at least 6 consecutive days when TN < 10th percentile	Days
Rainfall indices
CDD	Consecutive dry days	Maximum number of consecutive days with RR < 1 mm	Days
CWD	Consecutive wet days	Maximum number of consecutive days with RR  ≥  1 mm	Days
PRCPTOT	Annual total rainfall	Annual total rainfall (RR ≥ 1 mm)	mm
R10	Moderate rainy days	Annual count of days when PRCP ≥ 10 mm	Days
R20	Heavy rainy days	Annual count of days when PRCP ≥ 20 mm	Days
R100	Very heavy rainy days	Annual count of days when PRCP ≥ 100 mm, 100 is user defined threshold	Days
R95p	Very wet days	Annual total PRCP when RR > 95th percentile	mm
R99p	Extremely wet days	Annual total PRCP when RR > 99th percentile	mm
RX1day	Max 1-day rainfall amount	Monthly maximum 1-day rainfall	mm
Rx5day	Max 5-day rainfall amount	Monthly maximum consecutive 5-day rainfall	mm
SDII	Simple daily intensity index	The ratio of annual total rainfall to the number of wet days (≥1 mm)	mm/day