Park Forest Climate Normals

Official 1981-2010 Climate Normals

City: PARK FOREST 
State: IL
ID: 116616
Latitude: 41.4947
Longitude: -87.6803
Elevation:  709.8 ft

Temperature-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
High:    30.6   35.0   46.3   59.4   70.2   80.1   83.9   81.9   75.2   63.0   48.3   34.9
Mean:    23.1   27.0   37.7   49.6   60.1   70.1   74.4   72.5   65.0   52.9   40.4   27.6
 Low:    15.6   19.0   29.1   39.8   50.0   60.0   65.0   63.1   54.8   42.9   32.4   20.3
 CDD:       0      0      1     10     54    191    296    242    100     12      0      0
 HDD:    1299   1064    847    472    206     40      4     10    100    386    740   1159

Number of Days
T090:     0.0    0.0    0.0    0.0    0.7    3.1    4.9    3.1    1.1    0.0    0.0    0.0
T100:     0.0    0.0    0.0    0.0    0.0    0.1    0.3    0.0    0.0    0.0    0.0    0.0
T000:     4.2    2.0    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    1.8
T032:    28.4   25.3   19.7    5.3    0.2    0.0    0.0    0.0    0.1    3.1   14.7   26.5
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Annual Values

 High Temp:    59.2 F
 Mean Temp:    50.1 F
  Low Temp:    41.1 F
Cooling DD:     907
Heating DD:    6326

Days above  90 (T090):    13.0
Days above 100 (T100):     0.4
Days below   0 (T000):     8.1
Days below  32 (T032):   123.1
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Precipitation-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
Prcp:    1.99   1.85   2.61   3.77   4.47   4.56   4.55   4.50   3.18   3.35   3.58   2.62
Snow:     8.4    7.9    4.4    0.7    0.0    0.0    0.0    0.0    0.0    0.2    0.6    5.6

Number of Days
P001:     9.8    8.7   10.8   11.8   11.9    9.7    9.3    8.9    8.9   10.2   10.9   11.2
P010:     4.9    4.4    6.1    7.3    7.6    6.4    6.5    5.7    5.7    6.4    6.1    5.7
P100:     0.3    0.2    0.4    0.8    1.1    1.3    1.2    1.5    0.7    0.8    0.9    0.3
S001:     5.7    4.5    2.6    0.4    0.0    0.0    0.0    0.0    0.0    0.1    0.8    4.4
S010:     4.0    3.0    1.7    0.3    0.0    0.0    0.0    0.0    0.0    0.1    0.3    2.8
S100:     0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0
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Annual Values

Precipitation:   41.03 inches
     Snowfall:    27.8 inches

   Days precipitation at or above 0 inches (P000):   122.1
Days precipitation at or above 0.10 inches (P010):    72.8
Days Precipitation at or above 1.00 inches (P100):     9.5
      Days Snowfall at or above 0.1 inches (S001):    18.5
      Days Snowfall at or above 1.0 inches (S010):    12.2
     Days Snowfall at or above 10.0 inches (S100):     0.0

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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