July 2014 Climate Report for Puerto Rico and the U.S. Virgin Islands   

Synopsis

      A generally fair and mainly stable weather pattern prevailed across the local islands, with afternoon showers across portions of West Puerto Rico each day. For the second consecutive month, the near to below normal low level moisture combined with the absence of upper level dynamics resulted in limited shower/thunder activity across the local islands. In fact, on the 23rd and 24th of the month, our hope to see significant rainfall vanished when the remnants of former tropical depression two moved across the forecast area without any significant impact.  As June 2014, July 2014 can be described as a dry and hot month.

     Statistically, the average maximum temperature at the Luis Muñoz Marin International Airport (TJSJ) in San Juan Puerto Rico was approximately 1.7ºF warmer than the 30-year average from the National Climate Data Center (NCDC). The average minimum temperature at TJSJ was 79.6ºF, which is 1.5ºF above normal in respect to the 30 year average. Across the U.S. Virgin Islands, the mean temperature at Henry E. Rohlsen Airport (TISX) in Saint Croix and Cyril King Airport (TIST) in Saint Thomas was 85.0 and 84.4ºF, which is 1.4 and 0.4ºF above normal respectively. In terms of precipitation, a rainfall total of 3.57 inches was reported at TJSJ, which is 1.50 inches below normal. July 2014 produced 17 days of measurable rain at TJSJ, which means 55% of days where 0.01 inch or more accumulated. Meanwhile, 15 and 10 days of measurable rain were reported at TIST and TISX, resulting in 48 and 32% of the days where 0.01 inch or more accumulated.

Rainfall Accumulation       

Figure A – Graphical Display of rainfall for July 2014 across Puerto Rico and the U.S. Virgin Islands derived from a combination of USGS raingauge sensors and radar data. 

 

   

Climate Division Monthly Rain Normal Rain PON Rain YTD Normal Rain PON
North Coastal 2.94"  5.67"  52%  21.48"  32.67"  66% 
South Coastal 1.03"  2.97" 35%   8.85" 17.61"   50%
Northern Slopes 2.55"  5.49"  46%  18.39"  48.08"   44%
Southern Slopes  1.80" 3.83"  47%   17.02"  23.31" 73% 
Eastern Interior 3.96" 7.13"  56%   30.26" 39.44"   77%
Western Interior  5.77" 5.70"  101%  28.53"  38.61"  74% 
Puerto Rico 3.13"  5.13"  62%  21.03"  32.28"   65%
Saint Thomas & Saint John  1.12" 3.33"   34%  13.00" 18.58"  53% 
Saint Croix 1.47"   3.24" 44%   16.71" 17.32"   97%

 Figure B – Tabular Display of rainfall per climate zones for July 2014 across Puerto Rico and the U.S. Virgin Islands derived from 52 COOP stations.

PON -Percent of Normal Precipitation YTD- Year to Date

Monthly Hydrologic Reports (E5/E3)

River and flood conditions as well as flood crest information can all be found by going to the hydrology portion of the National Weather Service San Juan homepage or clicking here.

Highlights for Primary Local Climatological Data Sites 

New Records for July 2014

San Juan

Date New Record Previous Record
 July 2014 July 2014 ended as the 2nd warmest July on record with an average temperature of 85.0°F.  July 1980 continued to be the warmest July on record with an average temperature of 85.1°F. 
 July 2014 July 2014 ended as the 6th warmest month for any given year with an average temperature of 85.0°F.  June 2012 continued to be the warmest month for any given year with an average temperature of 85.7°F. 

Saint Thomas

Date New Record Previous Record
 July 2014 July 2014 ended as the 8th warmest July on record with an average temperature of 84.4°F.   July 1979 continued to be the warmest July on record with an average temperature of 86.6°F.  
 July 2014 July 2014 ended as the 4th driest July on record with 0.81". July 2007 continued to be the driest July on record with 0.03".  

Saint Croix

Date New Record Previous Record
 July 2014 July 2014 ended as the 3rd warmest July on record with an average temperature of 85.0°F.   July 1989 continued to be the warmest July on record with an average temperature of 86.5°F.  
 July 2014 July 2014 ended as the 2nd driest July on record with 0.90". July 1976 continued to be the driest July on record with 0.49".  
 July 2014 July 2014 ended as the 6th warmest month for any given year with an average temperature of 85.0°F.  August 1981 continued to be the warmest month for any given year with an average temperature of 86.5°F. 

July 2014 Statistics 

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

  San Juan Saint Thomas Saint Croix
High 88.7°F 90.0°F 88.7°F
Low 78.1°F 78.0°F 78.5°F
Avg. T 83.4°F 84.0°F 83.6°F
Pcpn. 5.07’’ 2.85’’ 3.04’’

  July 2014 Observations:

  San Juan Saint Thomas Saint Croix
High 90.4°F(+1.7°F) 89.3°F(-0.7°F)
91.7°F(+3.0°F)
Low 79.6°F(+1.5°F) 79.5°F(+1.5°F) 78.3°F(-0.2°F)
Avg. T 85.0°F(+1.6°F) 84.4°F(+0.4°F) 85.0°F(+1.4°F)
Pcpn. 3.57" (-1.50") 0.81" (-2.04") 0.90" (-2.14")

July 2014 Extremes:

  San Juan Saint Thomas Saint Croix
High  93°F July 16th and 1st 93°F July 24th   93°F July 12th and 10th
Low 77°F July 11th  77°F July 18th and 3rd   75°F July 30th

July Historical Statistics  

Highest  July Temperatures on record: 

San Juan Saint Thomas Saint Croix
95°F July 10th 1981  98°F July 27th 1994   94°F July 20th 1972
 94°F July 8th 1995 97°F July 24th 1994   94°F July 8th 1972
94°F July 1st 1995  97°F July 22nd 1994  93°F July 7th 2014

Lowest July Temperatures on record: 

San Juan Saint Thomas Saint Croix
69 °F July 1st 1959 66°F July 22nd 1999  64°F July 5th 1998 
69°F July 12th 1952  68°F July 21st 1999   67°F July 19th 1979
69°F July 11th 1952 70°F July 28th 1994  68°F July 22nd 1982 

Wettest Julys :

San Juan Saint Thomas Saint Croix
14.17"  2013  7.41"  1958   7.62"  1958
11.23"  1950  7.40"  2010  6.91"  1964
11.08"  2011  5.74"  2005 6.57"  2011 

Driest Julys :

San Juan Saint Thomas Saint Croix
 1.10"  1929  0.03"  2007  0.49"  1976
 1.12"  1974  0.24"  1956  0.90"   2014 
 1.41"  1947  0.74"  1994 0.95"   2009

 Looking ahead toward the month of August

Normal Rainfall (click on the image to enlarge)

  Normal Temperatures 

Maximum Temperatures Minimum Temperatures

Caribbean Climate Outlook for August - September - October (ASO) (click here to details) 

ASO rainfall in the Caribbean is likely to be below to normal with the highest confidence in the ABC Islands, Barbados, Belize, Cayman, Jamaica and the Windward Islands, but hardly predictable in the Bahamas, Cuba and the Turks and Caicos Islands.

Moon/Sun/Tide Data for the month of August 2014

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 unique local climate data web page for the NWS San Juan       


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