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

September 2012 Highlights

New Records for September 2012

 San Juan  

Date

New Record

Previous Record

September 15th

A record high temperature of 92°F.

This tied the previous record of 92°F set back in 2003 and 1978.

September 2012

September 2012 ended as the sixth driest September on record with 2.13 inches.

The driest September on record is September 1940 with1.49 inches.

September 2012

September 2012 ended as the warmest September on record with an average temperature of 84.9°F

This tied the previous record of 84.9°F set back in September 1995.

September 2012

September 2012 ended as the fifth hottest month of any year with an average temperature of 84.9°F.

The hottest month ever was June 2012 with an average temperature of 85.7°F.

 Saint Thomas

Date

New Record

Previous Record

 September 2012

September 2012 ended as the  driest September on record with 0.92 inches. 

This broke the previous record of 1.08 inches set back in September 1986. 

 Saint Croix 

Date

New Record

Previous Record

 September 16th

A record high temperature of 92°F.

This tied the previous record of 92°F set back in 1993°F.

September 2012 Statistics

 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’’

  September 2012 Observations:

 

San Juan

Saint Thomas

Saint Croix

High

90.9°F(+1.7°F)

89.1°F(-0.9°F)

88.6°F(-0.4°F)

Low

 78.9°F(+1.1°F)

 79.0°F(+1.1°F)

75.5°F(-1.8°F)

Avg. T

 84.9°F(+1.4°F)

84.0°F(0.0°F)

82.0°F(-1.1°F)

Pcpn.

2.13" (-3.64")

0.92" (-4.66")

3.74" (-1.12")

 September 2012 extremes:

 

San Juan

Saint Thomas

Saint Croix

High

 93°F September 22nd

 92°F September 24th,23rd and 17th

 92°F September 16th

Low

76°F September 25th 

 76°F September 25th,13th and 12th

 73°F September 1st

Monthly Summary 

  A generally fair and mainly dry weather pattern prevailed across Puerto Rico and US Virgin Islands with limited afternoon convection focused across western Puerto Rico each day. Brief periods of passing showers and thunderstorms were noted a few times, and were associated with the passage of weak easterly disturbances. However, rainfall accumulations associated with the aforementioned disturbances were marginal, and there is a lack of rainfall across portions of Eastern Puerto Rico as well as Saint Thomas. Overall, for the San Juan Metro Area, September 2012 can be described as a dry and hot month.

Rainfall Accumulations Year to Date (YTD)    

  Figure A – Graphical Display of precipitation for September 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.

September Historical Statistics              

Highest September Temperatures on record:

San Juan

Saint Thomas

Saint Croix

 97°F  September 1st, 1981

 98°F September 28th, 1993

 95°F September 14th, 1983

96°F September 18th, 1995 

 98°F September 5th, 1993

95°F September 25th, 1972 

96°F September 26th, 1987 

 98°F September 1st, 1993

95°F September 18th, 1972 

Lowest  September Temperatures on record:

San Juan

Saint Thomas

Saint Croix

 69°F  September 15th, 1960

 66°F September 16th, 1972

65°F September 8th, 1982 

69 °F September 6th, 1960 

68°F September 11th, 1991 

65°F September 25th, 1975 

69°F September 29th, 1955 

68°F September 8th, 1979 

 65°F September 17th, 1975

Wettest Septembers: 

San Juan

Saint Thomas

Saint Croix

15.15"    1996 

    14.94"    1953     

21.39"    1979 

14.83"    1989 

13.89"    2004 

19.15"    1996 

13.68"    1928 

12.86"    2008 

9.80"    1953 

Driest Septembers:

San Juan

Saint Thomas

Saint Croix

1.49" 1940 

0.92"  2012 

 1.07"    1981 

1.73" 1987 

1.08"    1986 

1.64"    2001 

1.78"  2006

1.42"    1987 

1.96"    1986 

Decadal September Observations for San Juan, Puerto Rico

 

2010-2012

2000’s

1990’s

1980’s

1970’s

1960’s

High

89.1°F

89.2°F

89.3°F

89.9°F

88.4°F

87.8°F

Low

78.0°F

77.2°F

76.9°F

76.6°F

76.9°F

74.9°F

Avg. T

83.5°F

83.2°F

83.1°F

83.2°F

82.7°F

81.4°F

Pcpn.

5.87"

5.86’’

6.44’’

4.61’’

6.02’’

5.83’’

Looking ahead toward the month of October

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’’

 

 Moon/Sun/Tide Data for the Month of October 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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