December 2011 Climate Report for Puerto Rico and the U.S. Virgin Islands

December 2011 Highlights

New Records for December 2011

Saint Croix 

Date

New Record

Old Record

 December 11th

A record daily rainfall of 0.94 inches. 

This breaks the old record of 0.90 inches set in 1976. 

 

December 2011 Statistics

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

 

San Juan

Saint Thomas

Saint Croix

High

83.9°F

85.6°F

84.7°F

Low

73.4°F

73.5°F

73.4°F

Avg. T

78.7°F

79.5°F

79.0°F

Pcpn.

5.02’’

2.96’’

2.97’’

  December 2011 Observations:

 

San Juan

Saint Thomas

Saint Croix

High

83.2°F(-0.7°F)

 84.6°F(-1.0°F)

82.8°F(-1.9°F)

Low

 73.5°F(+0.1°F)

 73.7°F(+0.2°F)

71.1°F(-2.3°F)

Avg. T

 78.3°F(-0.4°F)

79.2°F(-0.3°F)

77.0°F(-2.0°F)

Pcpn.

8.19"(+3.17")

2.51" (-0.45")

3.06" (+0.09")

 December 2011 extremes:

 

San Juan

Saint Thomas

Saint Croix

High

 86°F December30th

 87°F December30th

85°F December 30th 

Low

71°F December 4th 

 70°F December 13th

 70°F December 13th


 
Rainfall Accumulations Year to Date (YTD)

     2011 ranks as the second wettest year in nearly 113 years of record keeping in the San Juan Metro Area. An impressive rainfall total of 88.15 inches was reported at the San Juan International Airport, which is 31.80 inches above normal. This total was 1.35 less than 2010, the wettest year on record. According to Cooperative Weather Observer data, 2011 was a wet year across the entire forecast area, with 126% of the normal precipitation falling across all of Puerto Rico and 121% of the normal precipitation falling across the U.S. Virgin Islands.  Not surprisingly, 2011 ranks as the ninth wettest year on record at Charlotte Amalie on Saint Thomas as well as at Christiansted Airport on Saint Croix with a rainfall total of 46.14 and 47.72 inches respectively.

   

  Figure A – Graphical Display of December 2011 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
Normal
PON
 
YTD
YTD
X North Coast
74.47
61.74
121%
X South Coast
46.32
33.63
138%
X North Slopes
78.81
62.75
126%
X South Slopes
71.91
61.43
117%
X East Interior
106.65
79.50
134%
X West Interior
100.06
80.80
124%
Puerto Rico Average
79.70
63.31
126%
X U.S. Virgin Islands
48.21
39.78
121%

PON= Percent of Normal YTD= Year to Date   

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

December Historical Statistics              

Highest December Temperatures on record:

San Juan

Saint Thomas

Saint Croix

94°F December 6th 1989 

92°F December 26th 1995 

92°F December 27th 1995 

91°F December 24th 1995 

92°F December 25th 1995 

90°F December 10th 1998 

91°F December 26th 1994 

90°F December 11th 1995 

90°F December 29th 1972 


Lowest December Temperatures on record:

San Juan

Saint Thomas

Saint Croix

62°F December 29th 1917 

62°F December 5th 1942 

61°F December 29th 1982 

63°F December 22nd 1964 

63°F December 24th 1991 

 61°F December 24th 1964

63°F December 30th 1917 

63°F December 27th 1972 

62°F December 28th 1980 

Wettest Decembers: 

San Juan

Saint Thomas

Saint Croix

 16.81" December 1981

9.87" December 1960 

14.03" December 1960 

15.40" December 1910 

7.45" December 1957 

9.07" December 1975 

12.64" December 1922 

6.66" December 1981 

7.86" December 2001 

Driest Decembers:

San Juan

Saint Thomas

Saint Croix

0.68" December 1963 

0.25" December 1985 

0.37" December 2010 

0.98" December 1925 

 0.63" December 1963

0.75" December 2008 

1.02" December 1997 

 0.76" December 1956

0.79" December 1963 

Decadal December Observations for San Juan, Puerto Rico

 

2010-2011

2000’s

1990’s

1980’s

1970’s

1960’s

High

82.5°F

83.8°F

84.4°F

84.5°F

83.7°F

83.3°F

Low

72.8°F

72.8°F

72.5°F

72.4°F

73.3°F

71.1°F

Avg. T

77.7°F

78.3°F

78.5°F

78.4°F

78.5°F

77.2°F

Pcpn.

7.60"

5.19’’

4.08’’

5.36’’

4.57’’

4.54’’

Looking ahead toward the month of January

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

 

 

San Juan

Saint Thomas

Saint Croix

High

83.2°F

85.1°F

84.0°F

Low

72.0°F

72.5°F

72.4°F

Avg. T

77.6°F

78.8°F

78.2°F

Pcpn.

3.76’’

2.38’’

2.14’’

 

 Moon/Sun/Tide Data for the Month of January 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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