May 2012 Climate Report for Puerto Rico and the U.S. Virgin Islands

May 2012 Highlights

New Records for May 2012

Saint Thomas

Date

New Record

Old Record

 May 2nd

A daily maximum  rainfall of 0.69" 

This broke the old record of 0.66" set back in 2010. 

May 17th 

 A daily maximum rainfall of 2.16".

This broke the old record of 1.42" set back in 1981. 

May 2012

Eight wettest May on record with 6.72''

May 1960 ended as the wettest may on record with 16.39".

May 2012

Eleventh coolest May on record with an average temperature of 80.6°F.

May 1959 ended as the coolest May on record with an average temperature of 79.3°F

Saint Croix 

Date

New Record

Old Record

 May 26th

A record low temperature of 72°F. 

This tied the old record of 72°F set back in 1983. 

May 2012

Eleventh coolest May on record with an average temperature of 80.1°F.

May 1982 ended as the coolest May on record with an average temperature of 76.8°F

Other notable temperatures and precipitation amounts

Notable May 2012 High's

Notable May 2012 Low's

94°F  May 31st  Rio Piedras AES 

57°F  May 6th Cerro Maravilla 

 92°F  May 24th  Levittown

57°F  May 29th  Toro Negro 

 

Puerto Rico

Virgin Islands

Highest 24 hr Precip Total

 5.1"  May 7th  Morovis

 2.16"  May 17th  Saint Thomas

Highest Weekly Rainfall Accum.

     6.97"  May 13th-May 18th  Trujillo Alto

         3.64"  May 5th-May 11th           Fort Christiansted

May 2012 Statistics

 Average May Temperatures/Precipitation (NCDC 1981-2010 averages):

 

San Juan

Saint Thomas

Saint Croix

High

87.5°F

87.6°F

86.7°F

Low

76.3°F

76.2°F

76.1°F

Avg. T

81.9°F

81.9°F

81.4°F

Pcpn.

5.90’’

3.06’’

4.15’’

  May 2012 Observations:

 

San Juan

Saint Thomas

Saint Croix

High

86.7°F(-0.8°F)

 85.3°F(-2.3°F)

85.4°F(-1.3°F)

Low

 76.1°F(-0.2°F)

 75.9°F(-0.3°F)

74.9°F(-1.2°F)

Avg. T

 81.4°F(-0.5°F)

80.6°F(-1.3°F)

80.1°F(-1.3°F)

Pcpn.

5.28"(-0.62")

6.72"(+3.66")

3.69"(-0.46')

 May 2012 extremes:

 

San Juan

Saint Thomas

Saint Croix

High

 91°F May 30th

 87°F May 25th, 21st and 11th

87°F  May 31st, 30th and 1st 

Low

73°F May 4th  

 73°F May 2nd

 72°F May 26th

Monthly Summary 

     May 2012 began with an upper level trough combined with a surface trough and deep tropical moisture to produce scattered showers and isolated thunderstorms across the local area during the first week of the month. Days after, a normal pattern prevailed across the area with afternoon showers and thunderstorms across the interior and western portions of Puerto Rico. Around the 20th, a high pressure ridge established across the area, and brought fair and mainly dry weather conditions across the islands. This tranquil weather pattern prevailed until the last week of the month, when a bit wetter pattern returns once again across the forecast area.

Rainfall Accumulations Year to Date (YTD)    

 

  Figure A – Graphical Display of May 2012 precipitation across Puerto Rico and the U.S. Virgin Islands derived from a combination of rain gage and radar data.

 

Figure B – Graphical Display of YTD precipitation across Puerto Rico and the U.S. Virgin Islands derived from a combination of rain gage and radar data  

      

Coloso Rincon Calero Camp Isabella AES Mora Camp Borinquen Airport Guajataca Dam Arecibo Observatory Dos Bocas Manati 2E Palmarejo Morovis Corozal AES Negro Corozal Toa Baja Levittown Charlotte Amalie Wintberg Redhook Bay Cruz Bay Coral Bay East Hill Montpellier Beth Upper New Works Fort Christiansted Christiansted Airport East End Rio Piedras AES Trujillo Alto LMM Airport Canovanas Palma Sola Roosevelt Roads Paraiso Rio Blanco Lower Juncos Gurabo AES San Lorenzo Jajome Alto Aguirre Santa Isabel Aibonito Guayama Ponce 4E Juana Diaz Camp Boca Ensenada Magueyes Island Lajas AES Santa Rita Yauco Sabana Grande Hacienda Constanza Mayaguez City Maricao 2 SSW Maricao Fish Hatchery Adjuntas AES Adjuntas 1 NW Corral Viejo Penuelas Cacaos Orocovis Cerro Maravilla Villalba Aceituna Toro Negro Forest

   

Sector
Rain YTD
Normal YTD
PON YTD

 

 
 
X North Coast
29.62
20.83
142%
X South Coast
15.25
8.11
188%
X North Slopes
26.38
20.78
127%
X South Slopes
17.45
16.10
108%
X East Interior
35.81
24.99
143%
X West Interior
35.26
25.62
138%
Puerto Rico Average
26.63
19.41
137%
X U.S. Virgin Islands
13.70
11.94
115%

PON= Percent of Normal YTD= Year to Date   

  Figure C – Display of YTD precipitation by climate sectors derived from rain gage data.

May Historical Statistics              

Highest May Temperatures on record:

San Juan

Saint Thomas

Saint Croix

 96°F May 11th, 1980

97°F May 23rd, 1996 

94°F May 28th, 1972 

96°F May 5th, 1980 

 97°F May 19th, 1995

 93°F May 25th, 1994

95°F May 21st, 2005 

 97°F May 7th, 1994

 93°F May 30th, 1972

Lowest  May Temperatures on record:

San Juan

Saint Thomas

Saint Croix

 66°F May 5th, 1962

66°F May 5th, 1974 

 65°F May 8th, 1982

66°F May 3rd, 1903 

68°F May 11th, 1986 

 65°F May 7th, 1982

67°F May 6th, 1962 

 68°F May 7th, 1986

 65°F May 2nd, 1975

Wettest Mays:

San Juan

Saint Thomas

Saint Croix

16.88" 1936

16.39" 1960 

14.03" 1981

14.99" 1965

9.98" 1979

11.38" 2001

13.97" 1902

9.80" 1987

8.89" 1987

Driest Mays:

San Juan

Saint Thomas

Saint Croix

 0.44"  1972

0.06"  2008 

 0.22"  1974

 0.48"  1973

0.28"  2007 

0.28"  2005 

 0.71"  1925

0.47"  1973 

0.37"  2003

Decadal May Observations for San Juan, Puerto Rico

 

2010-2012

2000’s

1990’s

1980’s

1970’s

1960’s

High

86.2°F

87.4°F

87.8°F

88.2°F

87.4°F

86.0°F

Low

75.9°F

75.6°F

75.4°F

75.0°F

75.0°F

73.2°F

Avg. T

81.1°F

81.5°F

81.6°F

81.6°F

81.2°F

79.6°F

Pcpn.

9.56"

5.02’’

4.35’’

7.59’’

4.25’’

6.41’’

Looking ahead toward the month of June

Average June Temperatures/Precipitation (NCDC 1981-2010 averages):

 

 

San Juan

Saint Thomas

Saint Croix

High

88.9°F

89.3°F

87.9°F

Low

77.7°F

77.7°F

78.1°F

Avg. T

83.3°F

83.5°F

83.0°F

Pcpn.

4.41’’

2.53’’

2.31’’

 

Moon/Sun/Tide Data for the Month of June 2012   

Sunrise/sunset data, phase of the moon, as well as tide data can all be found by going to the climate portion of the National Weather Service San Juan Climate homepage and then clicking on the astronomical tab

 Click here to return to NWS San Juan Local Climate Web Page


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