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

July 2012 Highlights

 New Records for July 2012

 San Juan

Date

New Record

Old Record

July 20th

Daily maximum rainfall of 1.14"

This broke the old record of 0.98" set back in 1962.

July 31st

Daily maximum rainfall of  1.56"

This broke the old record of 1.12" set back in 1957.

July 2012

Eight warmest July on record with an average temperature of 83.7°F

July 1980 ended as the warmest July on record with an average temperature of 85.1°F.

Summer 2012 (Jun-Jul-Aug)

Summer 2012 currently ranks as the third warmest summer on record with an average temperature of 84.7°F (as of July 31st).

Summer 1980 ended as the warmest summer on record with an average temperature of 85.1°F.

Saint Croix 

Date

New Record

Old Record

 July 2012

Eleventh driest July on record with 1.90" 

 July 1976 ended as the driest July on record with 0.46"

 Summer 2012 (Jun-Jul-Aug)

 Summer 2012 currently ranks as the fourth driest summer on record with 2.16" (as of July 31st).

Summer 1985 ended as the driest summer on record with 3.64". 

Other notable temperatures and precipitation amounts

Notable July 2012 High's

Notable July 2012 Low's

 96°F   Borinquen   July 2nd

 58°F   Cerro Maravilla   July 6th

 95°F   Gurabo AES   July 5th

 60°F   Cerro Maravilla   July 15th

 

Puerto Rico

Virgin Islands

Highest 24 hr Precip Total

3.25"   Corozal AES   July 5th 

 1.84"   Redhook Bay   July 5th

Highest Weekly Rainfall Accum.

     6.15"   Adjuntas 1S  June 30th - July 6th

 1.84"   Redhook Bay  June 30th - July 6th 

July 2012 Statistics

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

 

San Juan

Saint Thomas

Saint Croix

High

88.7°F

90.0°F

88.7°F

Low

78.1°F

78.0°F

78.5°F

Avg. T

83.4°F

84.0°F

83.6°F

Pcpn.

5.07’’

2.85’’

3.04’’

  July 2012 Observations:

 

San Juan

Saint Thomas

Saint Croix

High

88.9°F(+0.2°F)

 88.7°F(-1.3°F)

89.0°F(+0.3°F)

Low

 78.5°F(+0.4°F)

 78.2°F(+0.2°F)

76.9°F(-1.6°F)

Avg. T

 83.7°F(+0.3°F)

83.4°F(-0.6°F)

83.0°F(-0.6°F)

Pcpn.

6.82"(+1.75")

3.09"(+0.24")

1.90"(-1.14")

 July 2012 Extremes:

 

San Juan

Saint Thomas

Saint Croix

High

 92°F July 1st

 91°F July 30th, 29th and 27th

 91°F July 27th, 17th and 1st

Low

74°F July 5th and 4th 

 74°F July 4th

 74°F July 19th, 13th and 12th

 Monthly Summary 

        July 2012 began with a vigorous tropical wave that affected the local islands on July 4th and left rainfall accumulations of between 2 and 4 inches, as well as gusty winds. After the aforementioned tropical wave, a generally fair and mainly dry weather pattern prevailed with limited afternoon convection focused mostly across western Puerto Rico each day. During the last week of the month, another active tropical wave affected the local islands and left rainfall accumulation between 1 and 2 inches island wide with higher accumulations of up to 5 inches in the Patillas and Ponce areas along the Southern Slopes.

Rainfall Accumulations Year to Date (YTD)    

 

  Figure A – Graphical Display of July 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
33.77
30.96
109%
X South Coast
18.19
12.55
145%
X North Slopes
31.95
31.44
102%
X South Slopes
23.67
26.52
89%
X East Interior
45.29
38.23
118%
X West Interior
43.84
37.36
115%
Puerto Rico Average
32.79
29.51
111%
X U.S. Virgin Islands
16.43
16.56
99%

PON= Percent of Normal YTD= Year to Date   

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

July Historical Statistics              

Highest July Temperatures on record:

San Juan

Saint Thomas

Saint Croix

 95°F July 10th 1981

98°F July 27th 1994

 94°F July 20th 1972

94°F July 8th 1995

97°F July 24th 1994

94°F July 8th 1972 

94°F July 1st 1995 

97°F July 22nd 1994 

 93°F July 10th 2007

Lowest  July Temperatures on record:

San Juan

Saint Thomas

Saint Croix

 69°F July 1st 1959

66°F July 22nd 1999

 67°F July 19th 1979

 69°F July 12th 1952

68°F July 21st 1999 

 68°F July 22nd 1982

 69°F July 11th 1952

 70°F July 28th 1994

 68°F July 19th 1960

Wettest Julys: 

San Juan

Saint Thomas

Saint Croix

 11.23"   1950

7.41"   1958 

7.62"   1958 

 11.08"   2011

7.40"   2010 

 6.91"   1964

10.98"   1901 

5.74"   2005 

 6.57"   2011

Driest Julys:

San Juan

Saint Thomas

Saint Croix

 1.10"   1929

 0.03"   2007

 0.49"   1976

1.12"   1974 

 0.27"   1956

0.95"   2009 

1.41"   1947

 0.74"   1994

1.09"   2002 

Decadal July Observations for San Juan, Puerto Rico

 

2010-2012

2000’s

1990’s

1980’s

1970’s

1960’s

High

88.3°F

88.8°F

88.6°F

89.6°F

88.5°F

87.3°F

Low

77.7°F

77.4°F

76.7°F

77.2°F

77.4°F

75.5°F

Avg. T

83.0°F

83.1°F

82.7°F

83.4°F

83.0°F

81.4°F

Pcpn.

8.81"

5.24’’

5.47’’

3.84’’

3.16’’

6.05’’

Looking ahead toward the month of August

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

 

 

San Juan

Saint Thomas

Saint Croix

High

89.2°F

90.2°F

89.2°F

Low

78.2°F

78.2°F

78.4°F

Avg. T

83.7°F

84.2°F

83.8°F

Pcpn.

5.46’’

3.74’’

3.15’’

Moon/Sun/Tide Data for the Month of August 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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