------------------------------------------------------------------------ *These data are preliminary and have not undergone final quality control by the National Climatic Data Center (NCDC). Therefore, these data are subject to revision. Final and certified climate data can be accessed at the NCDC - http://www.ncdc.noaa.gov . * Climatological Report (Monthly) 835 CXCA52 TJSJ 010429 CLMSJU CLIMATE REPORT NATIONAL WEATHER SERVICE SAN JUAN, PR 1228 AM AST MON JAN 1 2018 ................................... ...THE SAN JUAN AREA/PR CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1898 TO 2017 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE DATE(S) NORMAL ................................................................ TEMPERATURE (F) RECORD HIGH 94 12/06/1989 LOW 62 12/29/1917 HIGHEST 89 12/12 87 2 89 12/01 LOWEST 71 12/30 68 3 72 12/31 AVG. MAXIMUM 84.8 83.9 0.9 85.7 AVG. MINIMUM 75.2 73.4 1.8 75.8 MEAN 80.0 78.7 1.3 80.8 DAYS MAX >= 90 0 0.4 -0.4 0 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 0.0 0.0 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 16.81 1981 MINIMUM 0.68 1963 TOTALS 3.33 5.02 -1.69 4.30 DAILY AVG. 0.11 0.16 -0.05 0.14 DAYS >= .01 21 19.6 1.4 25 DAYS >= .10 6 11.0 -5.0 12 DAYS >= .50 1 2.7 -1.7 3 DAYS >= 1.00 1 1.0 0.0 0 GREATEST 24 HR. TOTAL 1.21 12/05 TO 12/05 SNOWFALL (INCHES) TOTALS 0.0 0.0 0.0 0.0 DEGREE_DAYS HEATING TOTAL 0 0 0 0 COOLING TOTAL 472 423 49 495 ................................................................. WIND (MPH) AVERAGE WIND SPEED 8.8 HIGHEST WIND SPEED/DIRECTION 26/070 DATE 12/27 HIGHEST GUST SPEED/DIRECTION 35/050 DATE 12/25 SKY COVER AVERAGE SKY COVER 0.40 AVERAGE RH (PERCENT) 81 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 4 RAIN 6 LIGHT RAIN 21 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 18 FOG W/VIS <= 1/4 MILE 0 HAZE 2 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. ------------------------------------------------------------------------