July Rainfall Summary

 


Parish Standard Precipitation Index (SPI) Assessment

Parish Mean Rainfall and Comparison with 30-yr Averages

  JUL JUL JUL % OF 30 YR NORMAL
Parishes KEY 2020 2019 30 YR NORMAL (1971-2000) 2020 2020 2020
MAY JUN JUL
Westmoreland WES 285 210 220 51 61 129
St. Elizabeth STE 129 89 131 51 84 97
Manchester MAN 152 92 92 27 99 165
Clarendon CLA 63 33 57 24 50 111
St. Catherine STC 110 56 85 19 56 129
Kingston & St. Andrew (KSA) KSA 64 67 65 22 63 99
St. Thomas STT 123 57 120 27 19 103
Portland POR 246 114 170 17 46 145
St. Mary STM 72 28 82 27 51 88
St. Ann STA 105 74 67 33 73 156
Trelawny TRE 178 95 76 94 98 235
St. James STJ 81 100 125 67 64 65
Hanover HAN 214 169 234 51 60 91
   
Jamaica JAM 140 91 117 40 61 119

Table 1: Parish Mean Rainfall

 

Observed SPI for April to July 2020

 
Parishes Apr/May May/Jun Jun/Jul Change
Westmoreland -1.17 -1.44 0.51 +1.95
St. Elizabeth -1.97 -0.68 0.40 +1.08
Manchester -2.29 -1.16 0.54 +1.70
Clarendon -1.55 -1.34 -0.29 +1.05
St. Catherine -2.38 -1.77 -0.15 +1.62
Kingston & St. Andrew -1.45 -0.94 -0.43 +0.51
St. Thomas -1.82 -1.77 -0.50 +1.27
Portland -2.77 -1.72 -0.06 +1.66
St. Mary -1.98 -1.26 0.06 +1.32
St. Ann -1.60 -1.31 0.24 +1.55
Trelawny -0.82 -0.53 1.47 +2.00
St. James -1.83 -1.46 -1.22 +0.24
Hanover -1.17 -1.55 -0.29 +1.26

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.