750
CXUS52 KKEY 011720
CLMMTH
CLIMATE REPORT
NATIONAL WEATHER SERVICE KEY WEST FL
120 PM EDT THU OCT 1 2026
...............................
..THE MARATHON CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2026
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1950 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
............................................................
TEMPERATURE (F)
RECORD
HIGH 97 09/17/2023
09/16/2023
LOW 66 09/22/1959
09/28/1954
09/04/1953
HIGHEST 92 09/01 91 09/11
09/25
LOWEST 73 09/29 73 09/13
AVG. MAXIMUM 88.5 89.9 -1.4 88.2
AVG. MINIMUM 79.8 78.4 1.4 77.9
MEAN 84.1 84.2 -0.1 83.1
DAYS MAX >= 90 11 19.0 -8.0 8
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 19.59 1959
MINIMUM 0.22 1961
TOTALS 4.98 6.37 -1.39 9.26
DAILY AVG. 0.17 0.21 -0.04 0.31
DAYS >= .01 18 15.1 2.9 20
DAYS >= .10 10 9.1 0.9 13
DAYS >= .50 3 3.6 -0.6 7
DAYS >= 1.00 1 1.4 -0.4 5
GREATEST
24 HR. TOTAL 2.56 09/29 TO 09/30
DEGREE DAYS
HEATING TOTAL 0 0 0 0
SINCE 7/1 0 0 0 0
COOLING TOTAL 579 574 5 548
SINCE 1/1 4052 4044 8 4096
............................................................
WIND (MPH)
AVERAGE WIND SPEED 5.8
HIGHEST WIND SPEED/DIRECTION 30/100 DATE 09/30
HIGHEST GUST SPEED/DIRECTION 40/110 DATE 09/30
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.20
NUMBER OF DAYS FAIR 26
NUMBER OF DAYS PC 4
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 77
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 20 MIXED PRECIP 0
HEAVY RAIN 8 RAIN 7
LIGHT RAIN 18 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 10 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.
MARATHON DAILY RECORDS, SEPTEMBER 2026 AND 2026
RECORD SEP 2026 2026
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MAXIMUM TEMPERATURE 0 0
COOL MAXIMUM TEMPERATURE 0 7
WARM MINIMUM TEMPERATURE 1 18
MINIMUM TEMPERATURE 0 2
RAINFALL 0 2
ROSS
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