Official 1981-2010 Climate Normals

City: CHICAGO NORTHERLY IS
State: IL
ID: 111550
Latitude: 41.8661
Longitude: -87.6153
Elevation:  591.7 ft

Temperature-Related Pseudonormals

For stations with short records, linear combinations of normals from nearby sites were used
to compute so-called pseudonormals.

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
High:    32.2   36.4   45.8   56.9   67.8   77.1   83.4   81.5   74.5   62.8   49.2   36.3
Mean:    26.0   29.7   38.4   49.6   59.8   69.5   76.5   75.1   67.8   56.0   43.4   30.6
 Low:    19.8   22.9   30.9   42.2   51.7   61.9   69.5   68.6   61.1   49.2   37.5   24.9
 CDD:       0      0      0      3     31    172    355    312    130     22      0      0
 HDD:    1209    990    826    466    194     37      0      1     46    301    650   1066

Number of Days
T090:     0.0    0.0    0.0    0.0    0.2    1.4    3.8    2.3    0.3    0.0    0.0    0.0
T100:     0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0
T000:     0.8    0.6    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.3
T032:    27.0   23.4   17.3    2.7    0.0    0.0    0.0    0.0    0.0    0.2    7.0   24.4
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Annual Values

 High Temp:    58.8 F
 Mean Temp:    51.9 F
  Low Temp:    45.1 F
Cooling DD:    1025
Heating DD:    5786

Days above  90 (T090):     8.0
Days above 100 (T100):     0.0
Days below   0 (T000):     1.7
Days below  32 (T032):   102.0
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KEY:
High - average daily high temperature, degrees F
Mean - average daily mean temperature, degrees F
Low - average daily low temperature, degrees F
CDD - cooling degree days, base 50F
HDD - heating degree days, base 50F
T090 - number of Days with Temperatures above 90 degrees F
T100 - number of Days with Temperatures above 100 degrees F
T000 - number of Days with Temperatures below 0 degrees F
T032 - number of Days with Temperatures below 32 degrees F
Prcp - precipitation, inches
Snow - snowfall, inches
P001 - number of Days with Precipitation of 0.01 inches or more
P010 - number of Days with Precipitation of 0.10 inches or more
P100 - number of Days with Precipitation of 1.00 inches or more
S001 - number of Days with Snowfall of 0.1 inches or more
S010 - number of Days with Snowfall of 1.0 inches or more
S100 - number of Days with Snowfall of 10.0 inches or more

Page Source:
Dr. Jim Angel, State Climatologist
Illinois State Water Survey
Prairie Research Institute
University of Illinois

Data Source:
NOAA National Climatic Data Center