Climatological Report (Monthly)
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
929
CXUS53 KLOT 011258
CLMRFD
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
758 AM CDT WED OCT 01 2025
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...THE ROCKFORD IL CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1905 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 103 09/07/1939
LOW 24 09/28/1942
HIGHEST 89 09/29 92 09/21
LOWEST 39 09/07 40 09/08
AVG. MAXIMUM 79.6 75.3 4.3 80.7
AVG. MINIMUM 53.4 53.5 -0.1 53.3
MEAN 66.5 64.4 2.1 67.0
DAYS MAX >= 90 0 2.0 -2.0 2
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.3 -0.3 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 10.68 1961
MINIMUM 0.05 1979
TOTALS 1.05 3.62 -2.57 2.05
DAILY AVG. 0.04 0.12 -0.08 0.07
DAYS >= .01 4 8.4 -4.4 2
DAYS >= .10 2 5.4 -3.4 2
DAYS >= .50 1 2.3 -1.3 2
DAYS >= 1.00 0 1.0 -1.0 1
GREATEST
24 HR. TOTAL 0.74 09/21 TO 09/21 1.31
DEGREE DAYS
HEATING TOTAL 59 107 -48 37
SINCE 7/1 78 116 -38 MM
COOLING TOTAL 111 89 22 106
SINCE 1/1 968 828 140 MM
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WIND (MPH)
AVERAGE WIND SPEED 4.5
HIGHEST WIND SPEED/DIRECTION 36/270 DATE 09/21
HIGHEST GUST SPEED/DIRECTION 50/260 DATE 09/21
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.44
NUMBER OF DAYS FAIR 13
NUMBER OF DAYS PC 10
NUMBER OF DAYS CLOUDY 7
AVERAGE RH (PERCENT) 69
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 5 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 3
LIGHT RAIN 6 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 17 FOG W/VIS <= 1/4 MILE 1
HAZE 1
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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