Official 1981-2010 Climate Normals
City: GRAND CHAIN DAM
State: IL
ID: 113580
Latitude: 37.2036
Longitude: -89.0422
Elevation: 384.7 ft
Temperature-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 42.1 46.7 56.7 67.3 75.8 84.3 88.6 88.1 81.9 70.1 57.7 44.8
Mean: 33.8 38.1 46.4 56.5 65.8 73.9 78.5 77.8 70.8 59.0 48.3 36.9
Low: 25.6 29.6 36.2 45.8 55.8 63.5 68.3 67.5 59.7 47.9 38.9 28.9
CDD: 0 0 1 17 100 275 417 397 200 36 2 0
HDD: 966 752 576 271 75 8 1 0 27 222 503 872
Number of Days
T090: 0.0 0.0 0.0 0.0 0.3 5.2 13.1 11.5 2.7 0.1 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.4 0.0 0.0 0.0 0.0
T000: 0.3 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
T032: 22.4 17.0 9.9 2.3 0.0 0.0 0.0 0.0 0.0 1.1 6.6 19.1
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Annual Values
High Temp: 67.1 F
Mean Temp: 57.3 F
Low Temp: 47.4 F
Cooling DD: 1447
Heating DD: 4273
Days above 90 (T090): 32.9
Days above 100 (T100): 0.4
Days below 0 (T000): 0.4
Days below 32 (T032): 78.4
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Precipitation-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 3.85 3.90 4.48 4.81 4.96 4.30 3.36 2.87 3.30 4.06 4.51 4.60
Snow: 2.1 3.3 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 1.8
Number of Days
P001: 9.6 8.6 9.7 10.2 10.5 9.3 7.5 5.8 7.2 7.3 8.4 9.9
P010: 6.7 6.1 7.4 7.3 8.5 7.0 5.2 4.4 5.0 5.3 6.3 6.9
P100: 1.1 0.7 1.2 1.3 1.6 1.3 1.2 0.9 1.1 1.2 1.1 1.0
S001: 1.1 1.5 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.8
S010: 0.7 0.9 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.6
S100: 0.0 0.1 0.1 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: 49.00 inches
Snowfall: 8.0 inches
Days precipitation at or above 0 inches (P000): 104.0
Days precipitation at or above 0.10 inches (P010): 76.1
Days Precipitation at or above 1.00 inches (P100): 13.7
Days Snowfall at or above 0.1 inches (S001): 3.7
Days Snowfall at or above 1.0 inches (S010): 2.4
Days Snowfall at or above 10.0 inches (S100): 0.2
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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
