Climatological Report (Monthly)
Issued by NWS Chicago, IL

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CXUS53 KLOT 011758
CLMRFD

CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1158 AM CST MON JAN 01 2024

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

...THE ROCKFORD IL CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1905 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             69   12/15/2021
                       12/03/2012
 LOW             -24   12/24/1983
HIGHEST           57   12/08                          61  12/29
                       12/25
LOWEST            12   12/19                         -10  12/22
                                                          12/23
AVG. MAXIMUM    42.3               34.3     8.0     34.5
AVG. MINIMUM    30.4               20.2    10.2     18.1
MEAN            36.3               27.3     9.0     26.3
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     1               12.0   -11.0       12
DAYS MIN <= 32    16               27.3   -11.3       24
DAYS MIN <= 0      0                2.4    -2.4        5

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        5.04   1971
 MINIMUM        0.17   1907
TOTALS          3.13               1.93    1.20     2.56
DAILY AVG.      0.10               0.06    0.04     0.08
DAYS >= .01       12                9.8     2.2        8
DAYS >= .10        8                4.6     3.4        3
DAYS >= .50        2                1.2     0.8        2
DAYS >= 1.00       0                0.3    -0.3        1
GREATEST
 24 HR. TOTAL   0.73   12/08 TO 12/09               1.73

SNOWFALL (INCHES)
RECORDS
 TOTAL          30.1   2000
TOTALS           2.8                9.4    -6.6      3.3
SINCE 7/1        4.3               11.9    -7.6       MM
SNOWDEPTH AVG.     0                                   1
DAYS >= 1.0        1                3.0    -2.0        1
GREATEST
 SNOW DEPTH        1   12/05                           2  12/26
                                                          12/27
                                                          12/28
 24 HR TOTAL     2.8                                 1.5

DEGREE DAYS
HEATING TOTAL    883               1170    -287     1196
 SINCE 7/1      2100               2486    -386       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1       805                839     -34       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.8
HIGHEST WIND SPEED/DIRECTION    33/310    DATE  12/18
HIGHEST GUST SPEED/DIRECTION    48/320    DATE  12/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.77
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY         20

AVERAGE RH (PERCENT)     79

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          3     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW               12     SLEET                      1
FOG                      19     FOG W/VIS <= 1/4 MILE      2
HAZE                      0

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

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