Official 1981-2010 Climate Normals
City: OLNEY 2S
State: IL
ID: 116446
Latitude: 38.7003
Longitude: -88.0817
Elevation: 479.9 ft
Temperature-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 37.8 42.7 53.7 65.6 75.0 84.3 87.2 86.5 80.3 68.3 54.7 41.2
Mean: 29.1 33.2 42.9 54.2 63.8 73.4 76.4 75.2 67.8 56.2 44.5 32.7
Low: 20.4 23.6 32.2 42.7 52.6 62.5 65.6 63.9 55.4 44.0 34.4 24.2
CDD: 0 0 2 17 82 262 354 318 145 24 1 0
HDD: 1113 892 685 342 119 10 0 2 59 298 615 1001
Number of Days
T090: 0.0 0.0 0.0 0.0 0.3 5.4 9.2 8.2 2.9 0.1 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 0.0 0.0 0.0
T000: 1.9 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9
T032: 26.2 22.0 16.4 4.3 0.1 0.0 0.0 0.0 0.0 4.3 12.8 23.5
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Annual Values
High Temp: 64.9 F
Mean Temp: 54.2 F
Low Temp: 43.5 F
Cooling DD: 1204
Heating DD: 5137
Days above 90 (T090): 26.1
Days above 100 (T100): 0.3
Days below 0 (T000): 3.7
Days below 32 (T032): 109.5
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Precipitation-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 3.05 2.73 4.34 4.33 5.83 4.19 4.33 3.20 3.07 3.99 4.48 3.88
Snow: 4.0 3.3 1.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.9
Number of Days
P001: 9.3 8.1 11.2 11.3 11.8 10.0 8.7 8.1 7.6 8.4 9.8 10.9
P010: 5.2 4.8 7.2 7.8 8.0 6.8 5.8 5.2 4.9 5.4 6.6 6.9
P100: 0.8 0.7 1.2 0.9 1.8 0.9 1.3 1.0 1.0 1.2 1.2 0.9
S001: 2.7 1.9 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.9
S010: 1.6 1.0 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.2
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: 47.42 inches
Snowfall: 11.6 inches
Days precipitation at or above 0 inches (P000): 115.2
Days precipitation at or above 0.10 inches (P010): 74.6
Days Precipitation at or above 1.00 inches (P100): 12.9
Days Snowfall at or above 0.1 inches (S001): 7.2
Days Snowfall at or above 1.0 inches (S010): 4.2
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
