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

 

March 2012 Highlights

New Records for March 2012

   San Juan 

Date

New Record

Old Record

 March 25th

A daily maximum rainfall of 3.09". 

This broke the old record of 1.75" set back in 1956. 

March 2012

Second wettest March on record with 9.27".

March 1927 ended as the wettest March on record with 9.38".

   Saint Thomas

Date

New Record

Old Record

 March 19th

A daily maximum rainfall of 0.43". 

 This broke the old of 0.39'' set back in 1961.

March 22nd 

 A daily maximum rainfall of 0.67".

This broke the old record of 0.22" set back in 2001. 

March 24th

A daily maximum rainfall of 0.27".

This broke the old record of 0.15" set back in 1999.

March 28th

A daily maximum rainfall of 0.70".

This broke the old record of 0.43" set back in 1954.

March 2012

Second wettest March on record with 3.95".

March 1961 ended as the wettest March on record with 4.37".

   Saint Croix 

Date

New Record

Old Record

March 21st

A daily maximum rainfall of 0.42".

This broke the old of 0.25'' set back in 2001.

March 24th

A daily maximum rainfall of 0.92".

This broke the old record of 0.42" set back in 1999.

March 2012

Second wettest March on record with 3.79".

March 1985 ended as the wettest March on record with 4.15".

 

Other notable temperatures and precipitation amounts

Notable March 2012 High's

Notable March 2012 Low's

92°F Gurabo AES March 28th 

 45°F Adjuntas AES March 14th

 90°F Gurabo AES March 5th

 48°F Adjuntas AES March 27th

 

Puerto Rico

Virgin Islands

Highest 24 hr Precip Total

 6.50" Arecibo Observatory March 29th

 1.36" Redhook  March 21st

Highest Weekly Rainfall Accum.

     12.83" Paraiso March 24th-29th

 2.80" Beth Upper March 24th-29th

March 2012 Statistics

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

 

San Juan

Saint Thomas

Saint Croix

High

84.9°F

85.9°F

84.6°F

Low

72.9°F

72.8°F

72.5°F

Avg. T

78.9°F

79.4°F

78.6°F

Pcpn.

1.95’’

1.42’’

1.56’’

  March 2012 Observations:

 

San Juan

Saint Thomas

Saint Croix

High

84.3°F(-0.6°F)

 83.4°F(-2.5°F)

83.9°F(-0.7°F)

Low

72.8°F(-0.1°F)

 72.7°F(-0.1°F)

71.2°F(-1.3°F)

Avg. T

 78.5°F(-0.4°F)

78.0°F(-1.4°F)

77.5°F(-1.1°F)

Pcpn.

9.27"(+7.32")

3.95"(+2.53")

3.79"(+2.23")

 March 2012 extremes:

 

San Juan

Saint Thomas

Saint Croix

High

 87°F March 16th, 5th and 4th

 86°F March 6th and 1st

86°F March 15th and 14th 

Low

71°F March 2nd 

 69°F March 19th

 68°F March 20th and 11th

Monthly Summary 

     A generally fair and mainly dry weather pattern prevailed during the first period of the month with just isolated morning showers across the windward side of the local islands and limited afternoon convection across Puerto Rico. By midmonth, a transition to a more convective/wet pattern was noticed.  A mid to upper level trough meandered between the Caribbean basin and the tropical Atlantic, generating favorable conditions for shower and thunderstorm enhancement. This feature interacted with diurnal heating and local effects to generate convective activity along the Cordillera Central and the coastal sections. Due to the northeast prevailing winds, afternoon showers and thunderstorms were concentrated along the interior and southwest portions of Puerto Rico. In addition, during the evening and early morning hours, showers and thunderstorms continued to re-develop over the eastern third of Puerto Rico as mid to upper level disturbances generated favorable conditions across the area. 

Rainfall Accumulations Year to Date (YTD)    

 

  Figure A – Graphical Display of March 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
17.16
9.82
175%
X South Coast
8.29
2.42
333%
X North Slopes
13.07
8.51
154%
X South Slopes
10.06
5.96
169%
X East Interior
19.16
11.38
168%
X West Interior
18.07
9.49
190%
Puerto Rico Average
14.30
7.94
180%
X U.S. Virgin Islands
7.36
5.57
132%

PON= Percent of Normal YTD= Year to Date   

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

March Historical Statistics              

Highest March Temperatures on record:

San Juan

Saint Thomas

Saint Croix

96°F March 19th, 1983 

94°F March 27th, 1994

92°F March 5th, 1996

95°F March 30th, 1984 

94°F March 26th, 1994 

91°F March 24th, 1973

94°F March 21st, 1983 

94°F March 21st, 1994 

91°F March 21st, 1973

Lowest  March Temperatures on record:

San Juan

Saint Thomas

Saint Croix

60°F March 3rd, 1957

60°F March 30th, 1972

60°F March 29th, 1977

61°F March 6th, 1970

60°F March 1st, 1972

62°F March 20th, 1982

61°F March 23rd, 1962

61°F March 29th, 1972

62°F March 8th, 1979

 Wettest Marchs

San Juan

Saint Thomas

Saint Croix

9.38"  1927

4.37"  1961

4.15"  1985

9.27"  2012

3.95"  2012

3.79"  2012

7.18"  1913

3.95"  1975

3.41"  1972

     Driest Marchs

San Juan

Saint Thomas

Saint Croix

0.00" 2005

0.01" 2008

0.17" 1951

0.45" 1951

0.36" 1959

0.29" 2003

0.46" 1924

0.44" 1984

0.39" 2005

Decadal March Observations for San Juan, Puerto Rico

 

2010-2012

2000’s

1990’s

1980’s

1970’s

1960’s

High

84.9°F

84.8°F

84.8°F

85.4°F

84.3°F

83.8°F

Low

73.0°F

72.4°F

71.4°F

71.9°F

72.4°F

70.2°F

Avg. T

79.0°F

78.6°F

78.1°F

78.6°F

78.4°F

77.0°F

Pcpn.

4.54"

1.57’’

1.82’’

2.29’’

2.32’’

2.36’’

Looking ahead toward the month of April

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

 

 

San Juan

Saint Thomas

Saint Croix

High

86.2°F

87.0°F

85.7°F

Low

74.4°F

74.3°F

74.2°F

Avg. T

80.3°F

80.6°F

80.0°F

Pcpn.

4.68’’

2.74’’

2.13’’

 

Moon/Sun/Tide Data for the Month of April 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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