Official 1981-2010 Climate Normals
City: CAIRO 3N
State: IL
ID: 093809
Latitude: 37.0422
Longitude: -89.1856
Elevation: 312.9 ft
Temperature-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 42.7 47.9 58.5 69.6 78.1 86.2 89.0 88.1 81.3 70.3 57.9 45.6
Mean: 34.0 38.5 47.7 58.0 67.5 75.6 78.9 77.5 69.9 58.8 48.1 37.3
Low: 25.2 29.1 36.9 46.4 56.9 65.1 68.8 67.0 58.6 47.2 38.3 28.9
CDD: 0 0 4 35 135 323 431 390 186 35 3 0
HDD: 962 742 541 245 58 4 0 1 38 229 510 861
Number of Days
T090: 0.0 0.0 0.0 0.2 1.1 9.1 14.2 11.4 3.7 0.1 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.2 0.2 0.4 0.0 0.0 0.0 0.0
T000: 0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2
T032: 23.3 17.5 9.9 1.7 0.0 0.0 0.0 0.0 0.0 1.4 7.1 19.7
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Annual Values
High Temp: 68.0 F
Mean Temp: 57.7 F
Low Temp: 47.4 F
Cooling DD: 1543
Heating DD: 4189
Days above 90 (T090): 39.8
Days above 100 (T100): 0.8
Days below 0 (T000): 0.8
Days below 32 (T032): 80.6
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Precipitation-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 3.69 3.77 4.05 4.63 5.27 3.91 4.14 3.01 3.19 4.05 4.46 4.47
Snow: 1.6 1.7 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.8
Number of Days
P001: 8.3 9.5 9.8 10.8 10.6 9.1 7.9 6.9 6.4 7.9 9.1 10.1
P010: 5.4 5.9 6.9 7.3 7.8 6.3 5.7 4.8 4.2 5.9 7.0 7.0
P100: 1.0 1.3 0.9 1.6 1.8 1.1 1.3 1.1 0.9 1.4 1.5 1.0
S001: 1.4 1.1 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6
S010: 0.6 0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2
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: 48.64 inches
Snowfall: 4.4 inches
Days precipitation at or above 0 inches (P000): 106.4
Days precipitation at or above 0.10 inches (P010): 74.2
Days Precipitation at or above 1.00 inches (P100): 14.9
Days Snowfall at or above 0.1 inches (S001): 3.5
Days Snowfall at or above 1.0 inches (S010): 1.4
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
