Name Units Definition Description
Temperature Extremes Index
 Magnitude
TNn ℃ Minimum daily minimun temperature Coldest nighttime temperature
TNm ℃ Mean daily minimun temperature Average nighttime temperature
TNx ℃ Maximum daily minimun temperature Warmest nighttime temperature
TXn ℃ Minimum daily maximum temperature Coldest daytime temperature
TXm ℃ Mean daily maximum temperature Average daytime temperature
TXx ℃ Maximum daily maximum temperature Warmest daytime temperature
DTR ℃ Average range of daily minimun and maximum temperature Daily Temperature Range
 Frequency
TN10p % Percentage of days when daily minimum temperature < 10th percentile Fraction of cold nights
TN90p % Percentage of days when daily minimum temperature > 90th percentile Fraction of warm nights
TX10p % Percentage of days when daily maximum temperature < 10th percentile Fraction of cool days
TX90p % Percentage of days when daily maximum temperature > 90th percentile Fraction of hot days
 Duration
WSDI days Warm Spell Duration Indicator;
number of days contributing to events where 6 or more consecutive
days have daily maximum temperature > 90th percentile		 Number of days contributing to
a warm period
Rainfall Extremes Index
 Magnitude
PRCPTOT mm Total Precipitation on wet days Total wet-day rainfall
SDII mm/day Simple Daily Intensity Index;
total rainfall divided by the number of wet days		 Average daily rainfall intensity
Rx1day mm Maximum amount of rainfall that falls in one day Maximum 1-day rainfall total
Rx5day mm Maximum amount of rainfall that falls in 5 consecutive days Maximum 5-day rainfall total
P95 mm 95th percentile of wet days Rainfall on very wet days
P99 mm 99th percentile of wet days Rainfall on extremely wet days
R95p mm Total daily rainfall > 95th percentile Total rainfall from very wet days
R99p mm Total daily rainfall > 99th percentile Total rainfall from extremely wet days
 Frequency
P95d days Number of days when daily rainfall > 95th percentile Number of very wet days
P99d days Number of days when daily rainfall > 99th percentile Number of extremely wet days
 Duration
CWD days Consecutive Wet Days;
maximum number of consecutive days when daily rainfall >= 1 mm		 Longest wet spell
CDD days Consecutive Dry Days;
maximum number of consecutive days when daily rainfall < 1 mm		 Longest dry spell