National Weather Service United States Department of Commerce

Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

 

September 2021 was drier than normal across eastern Kentucky.  Jackson and London had less than

three inches of precipitation with both locations around an inch below normal. Jackson averaged 69.7

degrees last month which was more than a half a degree warmer than normal. London finished September

with a temperature of 68.6 degrees which was a couple tenths of a degree cooler than normal. Climate 

data for Jackson dates back to 1981 while weather records began in 1954 at London.

 

The following are September climate summaries for Jackson and London as well as the September Local

Climatological Data reports for Jackson and London:

 

...THE JACKSON KY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2021...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1981 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             98   09/10/2019
 LOW              34   09/24/1989
HIGHEST           86   09/14         89      -3       87  09/02
                       09/19
                                                          09/01
LOWEST            47   09/24         42       5       46  09/30
                       09/26
                                                          09/19
AVG. MAXIMUM    78.8               79.0    -0.2     77.5
AVG. MINIMUM    60.6               59.1     1.5     59.5
MEAN            69.7               69.1     0.6     68.5
DAYS MAX >= 90     0                2.1    -2.1        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        9.17   2018
 MINIMUM           T   2019
TOTALS          2.39               3.42   -1.03     3.78
DAILY AVG.      0.08               0.11   -0.03     0.13
DAYS >= .01       10                8.2     1.8        8
DAYS >= .10        6                5.6     0.4        5
DAYS >= .50        2                2.2    -0.2        4
DAYS >= 1.00       0                1.0    -1.0        1
GREATEST
 24 HR. TOTAL   0.90   09/22 TO 09/23               1.13

SNOWFALL (INCHES)
RECORDS
 TOTAL            MM   MM
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1        0.0                0.0     0.0      0.0
SNOWDEPTH AVG.     0                                   0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0                                   0
 24 HR TOTAL       0                                 0.0

DEGREE DAYS
HEATING TOTAL     24                 39     -15       43
 SINCE 7/1        24                 40     -16       43
COOLING TOTAL    170                161       9      158
 SINCE 1/1      1292               1195      97     1345
................................................................

WIND (MPH)
AVERAGE WIND SPEED              1.6
HIGHEST WIND SPEED/DIRECTION    17/300    DATE  09/22
HIGHEST GUST SPEED/DIRECTION    29/310    DATE  09/22

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           19
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       7
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      20     FOG W/VIS <= 1/4 MILE      9
HAZE                      3

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

$$

 

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   JACKSON KY
                                          MONTH:     SEPTEMBER
                                          YEAR:      2021
                                          LATITUDE:   37 35 N
                                          LONGITUDE:  83 19 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  76  66  71  -2   0   6 0.21  0.0    0  3.2 13 330   M    M   7 12     20 320
 2  76  60  68  -5   0   3 0.00  0.0    0  0.3  6  90   M    M   1 1      17  80
 3  79  57  68  -5   0   3 0.00  0.0    0  0.1  6 100   M    M   0         9 110
 4  83  64  74   2   0   9 0.00  0.0    0  1.9  6 210   M    M   2        12 210
 5  74  64  69  -3   0   4 0.08  0.0    0  1.2  7 320   M    M   8 12     14 200
 6  80  63  72   0   0   7 0.00  0.0    0  0.1  7 310   M    M   4 12      9 290
 7  84  59  72   0   0   7 0.00  0.0    0  1.6  7 170   M    M   0        12 170
 8  82  65  74   3   0   9 0.14  0.0    0  2.7 13 330   M    M   5 12     20  10
 9  76  60  68  -3   0   3 0.00  0.0    0  2.1 12 320   M    M   6 1      19 270
10  77  55  66  -5   0   1 0.00  0.0    0  0.9  6 360   M    M   1 1      11 340
11  80  58  69  -2   0   4 0.00  0.0    0  3.0 10 170   M    M   0        18 160
12  83  65  74   4   0   9 0.00  0.0    0  2.7  9 170   M    M   0        17 260
13  85  67  76   6   0  11 0.00  0.0    0  2.1  7 160   M    M   1        11 220
14  86  67  77   7   0  12 0.00  0.0    0  1.5  7 160   M    M   1        12 200
15  75  63  69   0   0   4 0.77  0.0    0  1.8 16 330   M    M   7 123    27 320
16  81  63  72   3   0   7 0.00  0.0    0  0.1  5 140   M    M   7 12      8 110
17  85  65  75   6   0  10 0.00  0.0    0  0.9  6 300   M    M   1 1      10 320
18  85  67  76   8   0  11 0.00  0.0    0  0.5  6 130   M    M   2 12      9 110
19  86  68  77   9   0  12 0.13  0.0    0  0.9 10 170   M    M   3 13     21 170
20  81  68  75   7   0  10 0.02  0.0    0  2.1  8 130   M    M   6 1      13 180
21  76  67  72   5   0   7 0.13  0.0    0  1.1  7 150   M    M  10 1      12 160
22  71  53  62  -5   3   0 0.89  0.0    0  3.7 17 300   M    M   9 12     29 310
23  67  52  60  -7   5   0 0.01  0.0    0  2.0 10 290   M    M   6 1      18 280
24  71  47  59  -7   6   0 0.00  0.0    0  1.5  7 300   M    M   0        11 310
25  70  49  60  -6   5   0 0.01  0.0    0  1.7  9 290   M    M   2 1      17 260
26  73  47  60  -6   5   0 0.00  0.0    0  1.5  7 310   M    M   1 128    14 310
27  80  53  67   2   0   2 0.00  0.0    0  3.2 10 170   M    M   0        17 180
28  81  63  72   7   0   7 0.00  0.0    0  1.6  8 240   M    M   0        17 250
29  83  62  73   8   0   8 0.00  0.0    0  0.6  7 310   M    M   0 18     12 300
30  78  60  69   5   0   4 0.00  0.0    0  0.6  5 110   M    M   0 18     11  50
================================================================================
SM 2364 1817        24 170  2.39  0.0     47.2          M       90
================================================================================
AV 78.8 60.6                               1.6 FASTST   M    M   3    MAX(MPH)
                                 MISC ---->    17 300                 29 310
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:   JACKSON KY
                                          MONTH:     SEPTEMBER
                                          YEAR:      2021
                                          LATITUDE:   37 35 N
                                          LONGITUDE:  83 19 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 69.7   TOTAL FOR MONTH:   2.39    1 = FOG OR MIST
DPTR FM NORMAL:   0.6   DPTR FM NORMAL:   -1.03    2 = FOG REDUCING VISIBILITY
HIGHEST:    86 ON 19,14  GRTST 24HR  0.90 ON 22-23      TO 1/4 MILE OR LESS
LOWEST:     47 ON 26,24                             3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:   0.0 INCH    5 = HAIL
                        GRTST 24HR  0.0            6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:  0            7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   0    0.01 INCH OR MORE:  10
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   6
MIN 32 OR BELOW:   0    0.50 INCH OR MORE:   2
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   0

[HDD (BASE 65) ]
TOTAL THIS MO.    24    CLEAR  (SCALE 0-3)  19
DPTR FM NORMAL   -15    PTCLDY (SCALE 4-7)   8
TOTAL FM JUL 1    24    CLOUDY (SCALE 8-10)  3
DPTR FM NORMAL   -16

[CDD (BASE 65) ]
TOTAL THIS MO.   170
DPTR FM NORMAL     9    [PRESSURE DATA]
TOTAL FM JAN 1  1292    HIGHEST SLP 30.26 ON 12
DPTR FM NORMAL    97    LOWEST  SLP 29.55 ON  1

[REMARKS]
#FINAL-09-21#

 

London Kentucky data:

 

...THE LONDON KY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2021...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1954 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             97   09/05/2007
 LOW              32   09/24/1983
HIGHEST           86   09/14         MM      MM       88  09/10
LOWEST            44   09/24         MM      MM       43  09/22
AVG. MAXIMUM    78.9               80.0    -1.1     78.2
AVG. MINIMUM    58.4               57.6     0.8     58.4
MEAN            68.6               68.8    -0.2     68.3
DAYS MAX >= 90     0                3.0    -3.0        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        8.50   2004
 MINIMUM        0.11   2019
TOTALS          2.58               3.55   -0.97     4.30
DAILY AVG.      0.09               0.12   -0.03     0.14
DAYS >= .01        9                8.3     0.7        9
DAYS >= .10        5                5.5    -0.5        6
DAYS >= .50        3                2.1     0.9        4
DAYS >= 1.00       0                1.0    -1.0        2
GREATEST
 24 HR. TOTAL   0.90   09/22 TO 09/22               1.43

SNOWFALL (INCHES)
RECORDS
 TOTAL            MM   MM
TOTALS            MM                 MM      MM       MM
SINCE 7/1         MM                 MM      MM       MM
SNOWDEPTH AVG.    MM                                  MM
DAYS >= 1.0       MM                 MM      MM        0
GREATEST
 SNOW DEPTH       MM                                  MM
 24 HR TOTAL      MM                                  MM

DEGREE DAYS
HEATING TOTAL     29                 38      -9       46
 SINCE 7/1        29                 37      -8       46
COOLING TOTAL    144                152      -8      155
 SINCE 1/1      1184               1192      -8     1244
................................................................

WIND (MPH)
AVERAGE WIND SPEED              3.3
HIGHEST WIND SPEED/DIRECTION    23/290    DATE  09/22
HIGHEST GUST SPEED/DIRECTION    32/290    DATE  09/22

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.35
NUMBER OF DAYS FAIR           16
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     77

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       4
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      24     FOG W/VIS <= 1/4 MILE      5
HAZE                      0

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

$$

 

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6)

                                          STATION:   LONDON KY
                                          MONTH:     SEPTEMBER
                                          YEAR:      2021
                                          LATITUDE:   37  4 N
                                          LONGITUDE:  84  5 W

  TEMPERATURE IN F:       :PCPN:    SNOW:  WIND      :SUNSHINE: SKY     :PK WND
================================================================================
1   2   3   4   5  6A  6B    7    8   9   10  11  12  13   14  15   16   17  18
                                     12Z  AVG MX 2MIN
DY MAX MIN AVG DEP HDD CDD  WTR  SNW DPTH SPD SPD DIR MIN PSBL S-S WX    SPD DR
================================================================================

 1  78  65  72  -1   0   7 0.19    M    M  6.8 16 360   M    M   8 1      24 360
 2  77  59  68  -5   0   3 0.00    M    M  5.9 14  20   M    M   1        21  20
 3  81  54  68  -5   0   3 0.00    M    M  2.2  8 300   M    M   2        13 270
 4  82  62  72   0   0   7 0.00    M    M  4.0 15 240   M    M   2 1      19 270
 5  75  67  71  -1   0   6 0.07    M    M  5.2 13 220   M    M   8 1      17 210
 6  80  60  70  -2   0   5 0.00    M    M  2.4 10  60   M    M   4        16  40
 7  83  53  68  -4   0   3 0.00    M    M  2.7 10 240   M    M   1 1      16 240
 8  83  63  73   2   0   8 0.03    M    M  4.8 15 240   M    M   5 1      21 330
 9  78  57  68  -3   0   3 0.00    M    M  4.7 16 360   M    M   5 1      22 360
10  78  52  65  -6   0   0 0.00    M    M  1.4  8  20   M    M   2 1      12  30
11  80  53  67  -3   0   2 0.00    M    M  3.5 16 250   M    M   0 1      20 230
12  84  59  72   2   0   7 0.00    M    M  4.6 14 250   M    M   0        20 250
13  84  62  73   3   0   8 0.00    M    M  2.9  9 220   M    M   2 1      14 200
14  86  63  75   5   0  10 0.00    M    M  1.9 10 200   M    M   1 1      18 200
15  80  63  72   3   0   7 0.62    M    M  4.2 17  20   M    M   8 123    25  20
16  83  61  72   3   0   7 0.00    M    M  1.9  9  50   M    M   5 12     14  40
17  85  63  74   6   0   9 0.00    M    M  1.0  7 140   M    M   3 1      10 230
18  81  67  74   6   0   9    T    M    M  1.4  7 270   M    M   5 1      11 220
19  84  67  76   8   0  11 0.53    M    M  2.6 17 120   M    M   5 123    28 120
20  77  66  72   5   0   7 0.20    M    M  2.7 10 150   M    M   6 1      16 160
21  74  66  70   3   0   5 0.03    M    M  2.6 10 140   M    M   8 1      16 130
22  69  53  61  -6   4   0 0.90    M    M  8.2 23 290   M    M   9 1      32 290
23  66  49  58  -8   7   0 0.00    M    M  6.2 15 240   M    M   6        20 260
24  70  44  57  -9   8   0 0.00    M    M  1.2  8 250   M    M   0 1      12 280
25  70  48  59  -7   6   0 0.01    M    M  2.5 13 280   M    M   3 1      18 280
26  72  49  61  -4   4   0 0.00    M    M  2.3  9 250   M    M   5 12     13 230
27  80  50  65   0   0   0 0.00    M    M  3.9 14 240   M    M   0        22 250
28  81  58  70   6   0   5 0.00    M    M  3.6 15 240   M    M   0 1      19 240
29  84  58  71   7   0   6 0.00    M    M  1.4  8  30   M    M   2 1      12 320
30  82  60  71   7   0   6 0.00    M    M  1.8  8  30   M    M   3 12     12  30
================================================================================
SM 2367 1751        29 144  2.58    M    100.5          M      109
================================================================================
AV 78.9 58.4                               3.4 FASTST   M    M   4    MAX(MPH)
                                 MISC ---->    23 290                 32 290
================================================================================
NOTES:
# LAST OF SEVERAL OCCURRENCES

COLUMN 17 PEAK WIND IN M.P.H.

PRELIMINARY LOCAL CLIMATOLOGICAL DATA (WS FORM: F-6) , PAGE 2

                                          STATION:   LONDON KY
                                          MONTH:     SEPTEMBER
                                          YEAR:      2021
                                          LATITUDE:   37  4 N
                                          LONGITUDE:  84  5 W

[TEMPERATURE DATA]      [PRECIPITATION DATA]       SYMBOLS USED IN COLUMN 16

AVERAGE MONTHLY: 68.6   TOTAL FOR MONTH:   2.58    1 = FOG OR MIST
DPTR FM NORMAL:  -0.2   DPTR FM NORMAL:   -0.97    2 = FOG REDUCING VISIBILITY
HIGHEST:    86 ON 14    GRTST 24HR  0.90 ON 22-22      TO 1/4 MILE OR LESS
LOWEST:     44 ON 24                               3 = THUNDER
                        SNOW, ICE PELLETS, HAIL    4 = ICE PELLETS
                        TOTAL MONTH:  M            5 = HAIL
                        GRTST 24HR    M  ON   M    6 = FREEZING RAIN OR DRIZZLE
                        GRTST DEPTH:  M  ON   M    7 = DUSTSTORM OR SANDSTORM:
                                                       VSBY 1/2 MILE OR LESS
                                                   8 = SMOKE OR HAZE
[NO. OF DAYS WITH]      [WEATHER - DAYS WITH]      9 = BLOWING SNOW
                                                   X = TORNADO
MAX 32 OR BELOW:   0    0.01 INCH OR MORE:   9
MAX 90 OR ABOVE:   0    0.10 INCH OR MORE:   5
MIN 32 OR BELOW:   0    0.50 INCH OR MORE:   3
MIN  0 OR BELOW:   0    1.00 INCH OR MORE:   0

[HDD (BASE 65) ]
TOTAL THIS MO.    29    CLEAR  (SCALE 0-3)  15
DPTR FM NORMAL    -9    PTCLDY (SCALE 4-7)  14
TOTAL FM JUL 1    29    CLOUDY (SCALE 8-10)  1
DPTR FM NORMAL    -8

[CDD (BASE 65) ]
TOTAL THIS MO.   144
DPTR FM NORMAL    -8    [PRESSURE DATA]
TOTAL FM JAN 1  1184    HIGHEST SLP 30.28 ON 12
DPTR FM NORMAL    -8    LOWEST  SLP 29.57 ON  1

[REMARKS]
#FINAL-09-21#