National Weather Service Weather Forecast Office

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
CXUS52 KKEY 011450
CLMMTH

CLIMATE REPORT
NATIONAL WEATHER SERVICE KEY WEST FL
1050 AM EDT SUN OCT 01 2023

...................................

...THE MARATHON CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1950 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             97   09/16/2023
 LOW              66   09/22/1959
                       09/28/1954
                       09/04/1953
HIGHEST           97R  09/16                          96  09/02
                       09/17
                                                          09/11
                                                          09/12
LOWEST            74   09/21                          73  09/30
                       09/23
AVG. MAXIMUM    92.9               89.9     3.0     92.2
AVG. MINIMUM    80.1               78.4     1.7     79.6
MEAN            86.5               84.2     2.3     85.9
DAYS MAX >= 90    26               19.0     7.0       24
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       18.45   1963
 MINIMUM        1.71   1961
TOTALS          7.49               6.37    1.12     6.80
DAILY AVG.      0.25               0.21    0.04     0.23
DAYS >= .01       12               15.1    -3.1       16
DAYS >= .10        8                9.1    -1.1        9
DAYS >= .50        4                3.6     0.4        4
DAYS >= 1.00       3                1.4     1.6        2
GREATEST
 24 HR. TOTAL   1.93   09/23 TO 09/23


DEGREE DAYS
HEATING TOTAL      0                  0       0        0
 SINCE 7/1         0                  0       0       MM
COOLING TOTAL    655                574      81      634
 SINCE 1/1      4964               4044     920       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.1
HIGHEST WIND SPEED/DIRECTION    28/060    DATE  09/02
HIGHEST GUST SPEED/DIRECTION    36/060    DATE  09/02

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           27
NUMBER OF DAYS PC              3
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             14     MIXED PRECIP               0
HEAVY RAIN                6     RAIN                       8
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      1
HAZE                      7

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$

MARATHON DAILY RECORDS, SEPTEMBER 2023 AND 2023-TO-DATE

RECORD                    SEP 2023     2023
======                    ========   ========
MAXIMUM TEMPERATURE           7         77
COOL MAXIMUM TEMPERATURE      0          0
WARM MINIMUM TEMPERATURE      4         51
MINIMUM TEMPERATURE           0          0
RAINFALL                      1          6


TOP 10 WARMEST SEPTEMBERS ON RECORD FOR MARATHON

RANKING    YEAR    AVERAGE (DEG F)
=======    ====    ===============
   1       2023         86.5      <---
   2       1987         86.0
   3       2022         85.9
   4       2002         85.7
   5       2000         85.4
   6       2011         85.1
   7       1989         85.0
   8       1998         84.9
   9       2020         84.8
           2019         84.8
           2018         84.8
           2006         84.8

BT/NB