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
------------------------------------------------------------------------------------------
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
------------------------------------------------------------------------------------------
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
------------------------------------------------------------------------------------------
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
------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------
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
