February 2010 Climate Report for Puerto Rico and the U.S. Virgin Islands

 

February 2010 Highlights: 

 
Temperatures across Puerto Rico ranged from 47ºF in Adjuntas on the 6th of February to 93ºF in San Juan, Gurabo and Levittown (on the 25th, 12th and 26th of the month respectively). Temperatures across the U.S. Virgin Islands ranged from 61ºF, February 6th, at Beth Upper New Works on Saint Croix, to 88ºF, recorded at the Charlotte Amalie Airport on Saint Thomas February 26th & 27th. Other notable temperatures for February 2010 are listed below:

  

Other Notable February 2010 High’s:
 
91ºF in Aguadilla on February 26th
91ºF at Dos Bocas on February 16th   
91ºF in Lajas on February 16th   
91ºF in Corozal on February 19th
90ºF in Ponce, Trujillo Alto, Coloso and
Guayama
 
Other Notable February 2010 Low’s:
 
57ºF in Toro Negro on February 4th    
58ºF in Aibonito on February 6th    
59ºF in Cerro Maravilla on February 7th   
61ºF in Lajas, Gurabo and Maricao

*If multiple occurrences, all dates above reflect the latest occurrence of the month.

The highest 24-hour precipitation total across Puerto Rico for the month of February was 5.02”, which fell at the Maricao on the 22nd of the month. The highest weekly rainfall across Puerto Rico also occurred in Maricao, where 5.25” of rain accumulated the week ending February 26th. Across the U.S. Virgin Islands, the highest 24-hour precipitation total was at Red Hook Bay on Saint Thomas, where 0.85” fell on February 22nd. This 0.85” also represented the highest weekly rainfall (for the week ending February 26th) across the U.S. Virgin Islands for the month.
 

 

Figure 1A – Island wide averaged precipitation (and normals) - by week - for the weeks beginning on January 2nd and ending on February 26, 2010

 

 

Figure 1B – Graphical Display of February 2010 precipitation across Puerto Rico and the U.S. Virgin Islands derived from a combination of rain gage and radar data.

 

Monthly Weather Summary: 

February marks the midpoint of the dry season across Puerto Rico. On average, the Luis Muñoz International Airport in San Juan receives 2.30” of rain during the month of February, making February the second driest month on the island. February is also the second coolest month of the year, on average, across Puerto Rico. February 2010 was above normal, in terms of temperature, and well below normal, in terms of precipitation. Statistically, the San Juan area averaged 3.1 degrees above normal, and 1.22 inches of rainfall below normal.

The month of February began with a high pressure across the local area promoting fair weather conditions over the local islands during several days. The limited low level moisture and stable conditions helped to suppress significant shower activity almost until the second week of the month. The remnants of an old cold front prevailed days after creating dangerous surf conditions and some coastal flooding. By Mid February a new high pressure remained as the dominant feature across the local region maintaining dry and stable conditions. The remainder of February lived up with a low pressure and its associated cold front just north of Puerto Rico. This weather feature slightly increased the moisture across the local forecast area and brought unusual westerly winds.

February 2010 Statistics:
 

Average February Temperatures/Precipitation (NCDC 1971-2000 averages):

 
 
High:     
Low:     
AvgT:   
Pcpn:      
San Juan              
82.8ºF
70.9ºF    
76.9ºF
2.30”
Saint Thomas
85.9ºF    
71.9ºF    
78.9ºF
1.51”
Saint Croix
84.3ºF
71.9ºF
78.1ºF
1.94”
 
February 2010 Observations:
 
 
High:     
Low:     
AvgT:   
Pcpn:      
San Juan
86.5ºF     (+3.7ºF)
73.6ºF     (+2.7ºF) 
80.0ºF     (+3.1ºF) 
1.08”       (-1.28”) 
Saint Thomas
84.8ºF     (-1.1ºF)  
75.5ºF     (+3.6ºF) 
80.1ºF     (+1.2ºF) 
0.52”       (-0.99”) 
Saint Croix
84.8ºF     (+0.5ºF)
72.2ºF     (+0.3ºF)
78.5ºF     (+0.4ºF)
0.32”       (-1.62”)
 
February 2010 Extremes:
 
 
High:  
Low:  
San Juan
93ºF – February25th
71ºF – February 9th & 13th  
Saint Thomas
88ºF – February26th & 27th   
72ºF – February 6th
Saint Croix
87ºF – February 27th & 28th
68ºF – February 6th & 14th
 
 
February Historical Statistics:
 
Highest February Temperatures on record:
 
San Juan              
96ºF – February 27th, 1983
93ºF – February 25th, 2010*
*Most recent occurrence  
Saint Thomas      
93ºF – February 24th 1996
            February 1st & 9th, 1993
92ºF – February 25th, 1996*
*Most recent occurrence
Saint Croix
93ºF – February 10th, 2005
91ºF – February 19th & 21st, 1973
90ºF – February 11th, 1973*
*Most recent occurrence
 
Lowest February Temperatures on record:
 
San Juan              
62ºF – February 7th, 1968*
*Most recent occurrence
Saint Thomas
64ºF – February 26th & 27th, 1972
65ºF – February 6th, 1990*
*Most recent occurrence
Saint Croix
61ºF – February 5th, 1979
62ºF – February 24th, 1981
63ºF – February 23rd, 1981*
*Most recent occurrence
 
Wettest Februarys:
 
San Juan              
6.69” February 1982
6.44” February 1956
6.05” February 1989
Saint Thomas      
3.97” February 1954
3.79” February 1956
3.31” February 1983
Saint Croix
4.23”  February 1995
3.59”  February 1988
3.54”  February 1956
 
Driest Februarys:
 
San Juan              
0.20” February 1983
0.51” February 1993
0.71” February 1975
Saint Thomas
0.42” February 1987
0.47” February 1993
0.52” February 2010
Saint Croix
0.11” February 2005
0.18” February 1983
0.30” February 1986
 
 
 

2000-2010 Decade in Review:

 

 

                February 2010 was significantly warmer in terms of temperature and significantly drier than normal (as compared to the 30-year NCDC normals) across the San Juan Metro area. In fact, February 2010 was the warmest February on record and 11th driest at the Luis Muñoz Marine International Airport. This trend was also observed across the U.S. Virgin Islands where average temperatures averaged 1.2ºF and 0.4ºF above average across Saint Thomas and Saint Croix respectively. Additionally, February 2010 was the 3rd driest on record at the Charlotte Amalie Airport on Saint Thomas and the 4th driest on record at the Christiansted Airport on Saint Croix. A comparison of how February 2010 stacked up compared to the previous 6 decades can be found in the table below.
  

Decadal Observations for San Juan, Puerto Rico:

 

 

Decadal February High Temperatures:

2010
2000’s
1990’s
1980’s
1970’s
1960’s
1950’s
86.5ºF
83.0ºF
84.1ºF
84.3ºF
83.6ºF
83.1ºF
82.3ºF

 
 
 
Decadal February Low Temperatures:

2010
2000’s
1990’s
1980’s
1970’s
1960’s
1950’s
73.6ºF
71.1ºF
71.0ºF
71.0ºF
71.7ºF
68.9ºF
68.2ºF

 
Decadal February Average Temperatures:

2010
2000’s
1990’s
1980’s
1970’s
1960’s
1950’s
80.0ºF
77.1ºF
77.5ºF
77.6ºF
77.7ºF
76.0ºF
75.2ºF

 
 
Decadal February Precipitation:

2010
2000’s
1990’s
1980’s
1970’s
1960’s
1950’s
1.08”
1.90”
2.57”
2.75”
1.60”
2.13”
3.08”

 
* Records for San Juan began on January 1st, 1956
 

 

Figure 2 - Temperature deviations for San Juan, PR

 

Figure 3 - Temperature deviations for Saint Thomas, VI

 

Figure 4 - Temperature deviations for Saint Croix, VI

 

Figure 5 - February 2000's precipitation deviations from normal

 

 Figure 6 - February 2010 precipitation deviations for San Juan, Saint Thomas, and Saint Croix 

 

Looking ahead toward the month of March:

March generally is the last month of the dry season here in Puerto Rico. On average, the Luis Muñoz International Airport in San Juan receives only 2.14 inches of rain during the month of March (far shy of the 6.17 inches of rainfall normally received during November), making March the driest month on the island. March also is one of the cooler months on the island, with an average daily temperature of 77.6ºF, 1.1 ºF warmer than January, the coolest month of the year, yet 4.6 ºF cooler than August, the warmest month.
 
Average March Temperatures/Precipitation (NCDC 1971-2000 averages):
 
 
High:     
Low:     
AvgT:   
Pcpn:      
San Juan              
83.4ºF
71.7ºF    
77.6ºF
2.14”
Saint Thomas
86.5ºF    
72.5ºF    
79.5ºF
1.52”
Saint Croix
85.0ºF
72.3ºF
78.7ºF
1.80”
 

 

Moon/Sun/Tide Data for the month of March:

 

                The sun rises at 6:43 am AST and sets at 6:30 pm AST, in San Juan, Puerto Rico on March 1st. This represents a total of 11 hours and 47 minutes of daylight. By March 31st, the sun will rise at 6:20 am AST and set at 6:38 pm AST, providing a total of 12 hours and 18 minutes of daylight, or a total increase in 31 minutes over the course of the month. On March 13th, there will be exactly 12 hours of daylight in San Juan.

    At Charlotte Amalie on Saint Thomas, the sun will rise at 6:39 am AST and set at 6:26 pm AST on the 1st of the month. By the end of the month, the sun will rise at 6:15 am AST and set at 6:33 pm AST, also representing a total increase in daylight of 31 minutes for the month. Additionally, on March 14th, there will be exactly 12 hours of daylight observed in Charlotte Amalie on Saint Thomas.
 
                For the month of March, a full moon will be observed on the 29th of the month at 10:25 pm AST. There will also be a new moon on the 15th of the month at 5:01 pm AST. The last quarter of the moon will be observed on the 7th of March and the first quarter of the new moon will be observed on the 23rd of the month.
 
                Links to additional sunrise/sunset data, phases of the moon, as well as tide data can all be found by clicking on the climate link of the National Weather Service San Juan homepage (www.srh.noaa.gov/sju) and then clicking on the Astronomical tab.

 


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