Rainfall Summary

 


Parish Standard Precipitation Index (SPI) Assessment

Parish Mean Rainfall and Comparison with 30-yr Averages

  MAY MAY MAY % OF 30 YR NORMAL
Parishes KEY 2020 2019 30 YR NORMAL (1971-2000) 2020 2020 2020
MAR APR MAY
Westmoreland WES 141 290 274 47 77 51
St. Elizabeth STE 133 140 262 70 25 51
Manchester MAN 72 162 235 51 19 30
Clarendon CLA 33 78 139 101 27 24
St. Catherine STC 28 100 156 111 21 18
Kingston & St. Andrew (KSA) KSA 36 111 152 50 20 24
St. Thomas STT 44 136 162 58 8 27
Portland POR 52 218 292 207 4 18
St. Mary STM 40 70 148 102 16 27
St. Ann STA 54 102 158 159 20 34
Trelawny TRE 132 182 141 91 75 94
St. James STJ 132 198 189 89 40 70
Hanover HAN 158 278 309 25 66 51
   
Jamaica JAM 81 159 201 100 30 40

Table 1: Parish Mean Rainfall

 

Observed SPI for February to May 2020
Parishes Feb/Mar Mar/Apr Apr/May
Westmoreland -0.54 -0.81 -1.17
St. Elizabeth -0.39 -1.88 -1.94
Manchester -0.51 -1.92 -2.10
Clarendon 0.66 -0.61 -1.55
St. Catherine -0.19  -1.00 -2.35
Kingston & St. Andrew -0.72 -0.88 -1.42
St. Thomas -0.08 -1.37 -1.80
Portland 1.05 -0.07 -2.77
St. Mary 0.60 -0.74 -1.98
St. Ann 0.83 -0.42 -1.60
Trelawny 0.01 -0.61 -0.82
St. James -0.02 -1.81 -1.74
Hanover -1.23 -1.02 -1.17

Table 2: Parish SPI for December 2019 to March 2020

 

SPI Data Used In Jamaica Drought Monitor

SPI Value Category SPI Value Category
0.00 to -0.50 Near-normal (dry) 0.00 to 0.50 Near-normal (wet)
-0.51 to -0.79 Abnormally Dry 0.51 to 0.79 Abnormally Wet
-0.80 to -1.29 Moderately Dry 0.80 to 1.29 Moderately Wet
-1.30 to -1.59 Severely Dry 1.30 to 1.59 Severely Wet
-1.60 to -1.99 Extremely Dry 1.60 to 1.99 Extremely Wet
-2.00 or less Exceptionally Dry 2.00 or more Exceptionally Wet

Table 3: SPI Category Chart.