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

August 2012 and Summer 2012 Highlights

New Records

San Juan 

Date

New Record

Previous Record

Summer 2012 (Jun-Jul-Aug) 

 Summer 2012 ended as the third warmest summer on record with an average temperature of  84.3°F.

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

Saint Thomas

Date

New Record

Previous Record

 Summer 2012 (Jun-Jul-Aug)

Summer 2012 ended as the eleventh warmest summer on record with an average temperature of 83.6°F. 

Summer 1994 ended as the warmest summer on record with an average temperature of 86.7°F. 

Summer 2012 (Jun-Jul-Aug) 

 Summer 2012 ended as the eight driest summer on record with 5.96".

Summer 1994 ended as the driest summer on record with 3.74".  

Saint Croix 

Date

New Record

Previous Record

August 2012

August 2012 ended as the twelfth driest August on record with 2.27".

August 2005 ended as the driest August on record with 1.35". 

Summer 2012 (Jun-Jul-Aug)

Summer 2012 ended as the fifth driest summer on record with 4.43".

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

 August 2012 Statistics

 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’’

  August 2012 Observations:

 

San Juan

Saint Thomas

Saint Croix

High

88.9°F(-0.3°F)

 88.6°F(-1.6°F)

89.8°F(+0.6°F)

Low

 78.1°F(-0.1°F)

 78.0°F(-0.2°F)

77.0°F(-1.4°F)

Avg. T

 83.5°F(-0.2°F)

83.3°F(-0.9°F)

83.4°F(-0.9°F)

Pcpn.

7.48" (+2.02")

2.79" (-0.95")

2.27" (-0.88")

 August 2012 extremes:

 

San Juan

Saint Thomas

Saint Croix

High

 93°F August 9th

92°F August 20th, 11th and 2nd 

 93°F August 11th and 2nd

Low

74°F August 13th and 12th 

 75°F August 24th

 72°F August 24th

 Monthly Summary 

     August 2012 began with Tropical Storm Ernesto. This system tracked south of Puerto Rico and U.S. Virgin Islands on August 3rd and 4th  and left periods of showers and thunderstorms mainly over the southern slopes of the island. Afterward, a generally fair weather pattern prevailed, with limited convection across western Puerto Rico. By the end of the month, Tropical Storm Isaac tracked south of the area leaving hazardous sea across the Caribbean waters. The outer bands of Isaac left rainfall accumulations of 2 to 4 inches island-wide with isolated amounts between 6 and 8 inches across sectors of eastern and southern Puerto Rico during a four day period. Strong gusty winds were also reported with Isaac.

Rainfall Accumulations Year to Date (YTD)    

 

  Figure A – Graphical Display of precipitation for August 2012 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  

  

Figure C – Graphical display of departure from normal precipitation YTD.

August Historical Statistics              

Highest August Temperatures on record:

San Juan

Saint Thomas

Saint Croix

97°F  August 21st, 1980 

99°F  August 4th, 1994 

 95°F  August 25th, 1999

96°F  August 20th, 1980 

99°F  August 8th, 1979 

 95°F  August 19th, 1972

96°F  August 23rd, 1974 

98°F  August 13th, 1994 

94°F  August 4th,  1972 

Lowest  August Temperatures on record:

San Juan

Saint Thomas

Saint Croix

68°F  August 12th, 1904 

62°F  August 2nd, 2001 

 63°F  August 17th, 1978

69°F  August 29th, 1916 

64°F  August 2nd, 1972 

67°F  August 31st, 1979 

69°F  August 7th, 1913 

64°F  August 1st, 1972 

67°F  August 16th, 1978 

Wettest Augusts: 

San Juan

Saint Thomas

Saint Croix

18.56"  2011 

 9.14"  2011 

11.41"  1979 

14.10"  1944 

8.54"  1963

11.04"  1989 

11.76"  1955 

 8.22"  2005 

11.04"  1989 

Driest Augusts:

San Juan

Saint Thomas

Saint Croix

1.53"  1919 

 0.70"  1993

 1.35"  2005

1.83"  1994 

 0.98"  1991

 1.40"  1980

1.93"  1982 

 1.26"  2002 

 1.51"  2009

Decadal August Observations for San Juan, Puerto Rico

 

2010-2011

2000’s

1990’s

1980’s

1970’s

1960’s

High

88.8°F

89.0°F

89.4°F

89.9°F

88.3°F

87.8°F

Low

78.1°F

77.6°F

77.3°F

77.0°F

77.3°F

75.6°F

Avg. T

83.5°F

83.3°F

83.3°F

83.4°F

82.8°F

81.7°F

Pcpn.

11.48"

5.92’’

4.83’’

5.08’’

5.27’’

6.13’’

Looking ahead toward the month of September

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

 

 

San Juan

Saint Thomas

Saint Croix

High

89.2°F

90.0°F

89.0°F

Low

77.8°F

77.9°F

77.3°F

Avg. T

83.5°F

84.0°F

83.1°F

Pcpn.

5.77’’

5.58’’

4.86’’

 

 Moon/Sun/Tide Data for the month of September 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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