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