October 2009 was the warmest October on record at the Luis Muñoz Marin International Airport in San Juan. The average low temperature was 79F, a full degree warmer than the previous record of 78F set in 1980, and the average high temperature was the 89.9F, the seventh warmest average high temperature for the month ever recorded. During the month, the record warmest minimum temperature was tied or broken on 15 separate days, and the average daily temperature was above normal every single day of the month. Below is a table with the 10 warmest October average temperatures, minimum temperatures, and maximum temperatures.

 

1
84.4
2009
1
79
2009
1
91
1982
2
84.4
1980
2
78
1980
2
90.8
1981
3
84
1992
3
77.4
1983
2
90.8
1980
4
83.7
1982
4
77.2
1992
4
90.7
1992
5
83.5
1983
5
77.1
1976
5
90.7
1987
6
83.5
1973
5
77.1
1973
6
90.1
1979
7
83.3
1981
7
77
2006
7
89.9
2009
8
83.3
1987
8
76.9
1972
8
89.8
1973
9
83.1
2006
9
76.7
1997
9
89.7
1983
10
83
1979
10
76.5
1998
10
89.4
1994

(Data from the Luis Muñoz International Airport dates back to January 1st, 1956.)

 

             Year to date, the temperature in San Juan has averaged 82.5F, which is the 4th warmest start to a year on record at the airport. This is 1.2F below the strong El Niño year of 1983, which ended up being the warmest year on record in San Juan.  Click here to see the monthly climate summary for San Juan. A graphical display of the average monthly temperatures for 2009 and their respective deviations is displayed below.

 

(Average temperatures by month in San Juan, PR and the 2009 departures marked in red.) 


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