Definitions of the 11 indices for precipitation

1. Monthly maximum 1-day precipitation (Rx1day)
   Let RR_ij be the daily precipitation amount on day i in period j. The maximum 1-day value for period j are Rx1day_j = max (RR_ij)
2. Monthly maximum consecutive 5-day precipitation(Rx5day)
   Let RR_kj be the precipitation amount for the 5-day interval ending k, period j. Then maximum 5-day values for period j are Rx5day_j = max (RRk_j)
3. Simple precipitation intensity index (SDII)
   Let RR_wj be the daily precipitation amount on wet days, w (RR ≥ 1mm) in period j.
4. Annual count of days when PRCP ≥ 1mm(RR1mm)
   Let RR_ij be the daily precipitation amount on day i in period j. Count the number of days where RR_ij ≥ 1mm
5. Annual count of days when PRCP ≥ 10mm(R10mm)
   Let RR_ij be the daily precipitation amount on day i in period j. Count the number of days where RR_ij ≥ 10mm
6. Annual count of days when PRCP ≥ 20mm(R20mm)
   Let RR_ij be the daily precipitation amount on day i in period j. Count the number of days where RR_ij ≥ 20mm
7. Annual count of days when PRCP ≥ 80mm(R80mm)
   Let RR_ij be the daily precipitation amount on day i in period j. Count the number of days where RR_ij ≥ 80mm
8. Annual count of days when PRCP ≥ 200mm(R200mm)
   Let RR_ij be the daily precipitation amount on day i in period j. Count the number of days where RR_ij ≥ 200mm
9. Maximum length of dry spell, maximum number of consecutive days with RR < 1mm(CDD)
   Let RR_ij be the daily precipitation amount on day i in period j. Count the largest number of consecutive days where: RR_ij < 1mm
10. Maximum length of wet spell, maximum number of consecutive days with RR ≥ 1mm(CWD)
    Let RR_ij be the daily precipitation amount on day i in period j. Count the largest number of consecutive days where: RR_ij ≥ 1mm
11. Annual total precipitation in wet days(PRCPTOT)
    Let RR_ij be the daily precipitation amount on day i in period j.

Definitions of the 11 core indices for temperature

1. Monthly minimum value of daily minimum temperature(TN_n)
   Let TN_n be the daily minimum temperatures in month k, period j. The minimum daily minimum temperature each month is then: TN_nkj=min(TN_nkj)
2. Monthly maximum value of daily maximum temperature(TX_x)
   Let TX_x be the daily maximum temperatures in month k, period j. The maximum daily maximum temperature each month is then: TX_xkj=max(TX_xkj)
3. Daily temperature range(DTR)
   Monthly mean difference between TX and TN
4. Monthly maximum value of daily minimum temperature(TN_x)
   Let TN_x be the daily minimum temperatures in month k, period j. The maximum daily minimum temperature each month is then: TN_xkj=max(TN_xkj)
5. Monthly minimum value of daily maximum temperature(TX_n)
   Let TX_n be the daily maximum temperatures in month k, period j. The minimum daily maximum temperature each month is then: TX_nkj=min(TX_nkj)
6. Percentage of days when TX > 90^th percentile(TX90p)
   Let TX_ij be the daily maximum temperature on day i in period j and let TX_in90 be the calendar day 90^th percentile centred on a 5-day window for the base period 1961-1990
7. Percentage of days when TX < 10^th percentile(TX10p)
   Let TX_ij be the daily maximum temperature on day i in period j and let TX_in10 be the calendar day 10^th percentile centred on a 5-day window for the base period 1961-1990
8. Percentage of days when TN > 90^th percentile(TN90p)
   Let TN_ij be the daily minimum temperature on day i in period j and let TN_in90 be the calendar day 90^th percentile centred on a 5-day window for the base period 1961-1990
9. Percentage of days when TN < 10^th percentile(TN10p)
   Let TN_ij be the daily minimum temperature on day i in period j and let TN_in10 be the calendar day 10^th percentile centred on a 5-day window for the base period 1961-1990
10. Warm wave duration index(HWDI)
    Annual count of days with at least 3 consecutive days when TX > 95^th percentile
11. Cold wave duration index(CWDI)
    Annual count of days with at least 3 consecutive days when TN < 5^th percentile