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

October 2012 Highlights

New Records for October 2012

 San Juan                                                                                                               

Date

New Record

Previous Record

October 28th

A record high temperature of 94°F.

This broke the previous record of 92°F set back in 1992 and 1971.

October 2012

October 2012 ended as the fourth warmest October on record with an average temperature of 83.9°F.

October 2009 ended as the warmest October on record with an average temperature of 84.4°F.

Saint Thomas

Date

New Record

Previous Record

 October 21st

A record rainfall of 1.32". 

This broke the previous record of 1.13" set back in 1998.

October 2012 

 October 2012 ended as the ninth warmest October on record with an average temperature of 83.3°F.

October 1993 ended as the warmest October on record with an average temperature of 85.5°F. 

Saint Croix 

Date

New Record

Previous Record

October 2012 

 October 2012 ended as the seventh warmest October on record with an average temperature of 82.7°F.

October 1972 ended as the warmest October on record with an average temperature of 84.3°F. 

 October 2012 Statistics

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

 

San Juan

Saint Thomas

Saint Croix

High

88.4°F

88.8°F

87.8°F

Low

76.9°F

76.8°F

76.4°F

Avg. T

82.6°F

82.8°F

82.1°F

Pcpn.

5.59’’

5.42’’

5.25’’

  October 2012 Observations:

 

San Juan

Saint Thomas

Saint Croix

High

89.9°F(+1.5°F)

 87.9°F(-0.9°F)

88.3°F(+0.5°F)

Low

 77.9°F(+1.0°F)

 78.8°F(+2.0°F)

77.1°F(+0.7°F)

Avg. T

 83.9°F(+1.3°F)

83.3°F(+0.5°F)

82.7°F(+0.6°F)

Pcpn.

4.67" (-0.92")

4.62" (-0.80")

2.64" (-2.61")

 October 2012 extremes:

 

San Juan

Saint Thomas

Saint Croix

High

 94°F October 28th and 27th

 92°F October 2nd

90°F October 31st 

Low

74°F October 12th 

 75°F October 6th

 73°F October 6th

Monthly Summary 

     Afternoon convection dominated the first half of October as a result of daytime heating and sea breeze convergence. The steering flow focused the afternoon shower activity along the western interior and western portion of Puerto Rico. By the end of the month, a broad area of low pressure across the western Caribbean became Hurricane Sandy, and affected Cuba and Hispaniola as it moved northward. Hurricane Sandy created an unusual wind field across the forecast area and brought deep tropical moisture from the southwest, as well as above normal temperatures along the north coast of Puerto Rico. Showers and thunderstorms associated with the outer bands were strong enough to produce moderate to major flooding across the Guayanilla and Caguas area between October 25th and October 27th.

Rainfall Accumulations Year to Date (YTD)    

 

  Figure A – Graphical Display of precipitation for October 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.

October Historical Statistics              

Highest October Temperatures on record:

San Juan

Saint Thomas

Saint Croix

 98°F October 9th, 1981

 97°F October 14th, 1994

98°F October 1st, 1972

97°F October 13th, 1987

 97°F  October 13th, 1994

 97°F October 11th, 1995

 97°F October 12th,1987

 97°F October 15th, 1993

95°F October 4th, 1972 

Lowest  October Temperatures on record:

San Juan

Saint Thomas

Saint Croix

67°F October 20th, 1959

66°F October 29th, 2007

65°F October 23rd, 1983

68°F October 30th, 2001

66°F October 28th, 2007

65°F October 22nd, 1983

68°F October 26th,1961

66°F October 27th, 2007

65°F October 31st, 1975

Wettest Octobers: 

San Juan

Saint Thomas

Saint Croix

15.06"   1970 

  16.20"   2010 

 16.19"   1977

12.15"   1927 

  12.49"   2005 

 12.95"   1990

11.94"   2005 

 12.45"   1974

 11.79"   1954

Driest Octobers:

San Juan

Saint Thomas

Saint Croix

 1.18"   1979 

  1.95"   2011 

1.06"   1964 

 1.61"   1915 

  2.00"   1988 

1.11"   2002 

 1.63"   1963 

 2.21"   1979

1.23"   1960 

Decadal October Observations for San Juan, Puerto Rico

 

2010-2012

2000’s

1990’s

1980’s

1970’s

1960’s

High

88.6°F

88.2°F

88.6°F

89.2°F

88.3°F

87.5°F

Low

76.9°F

76.4°F

76.1°F

75.5°F

76.4°F

74.2°F

Avg. T

82.8°F

82.3°F

82.4°F

82.4°F

82.4°F

80.8°F

Pcpn.

6.01"

6.20’’

4.44’’

5.58’’

6.29’’

4.85’’

Looking ahead toward the month of November

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

 

 

San Juan

Saint Thomas

Saint Croix

High

85.9°F

87.0°F

86.3°F

Low

75.2°F

75.2°F

75.0°F

Avg. T

80.6°F

81.1°F

80.7°F

Pcpn.

6.35’’

5.23’’

5.46’’

 

 Moon/Sun/Tide Data for the month of November 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  


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