Official 1981-2010 Climate Normals City: IUKA 12 SW State: IL ID: 114400 Latitude: 38.4931 Longitude: -88.9703 Elevation: 569.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 38.4 43.9 54.5 66.0 74.4 83.9 88.2 87.6 79.9 68.9 55.3 41.4 Mean: 29.1 33.8 43.8 54.5 63.2 72.9 76.9 75.5 67.1 56.3 45.0 32.5 Low: 19.8 23.7 33.1 43.0 52.1 62.0 65.5 63.5 54.3 43.7 34.8 23.6 CDD: 0 0 3 17 75 250 368 330 126 26 2 0 HDD: 1113 873 660 332 129 12 1 3 63 295 600 1007 Number of Days T090: 0.0 0.0 0.0 0.0 0.3 5.1 12.0 10.5 2.6 0.2 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.5 0.3 0.0 0.0 0.0 0.0 T000: 1.7 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9 T032: 26.4 22.5 15.4 3.3 0.2 0.0 0.0 0.0 0.1 3.4 12.3 24.7 ------------------------------------------------------------------------------------------ Annual Values High Temp: 65.3 F Mean Temp: 54.3 F Low Temp: 43.4 F Cooling DD: 1196 Heating DD: 5089 Days above 90 (T090): 30.7 Days above 100 (T100): 0.8 Days below 0 (T000): 2.7 Days below 32 (T032): 108.3 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.81 2.69 3.85 4.13 5.37 3.99 3.60 3.06 3.05 3.64 4.28 3.48 Number of Days P001: 8.2 7.9 10.4 10.5 12.3 10.0 9.1 7.2 6.7 8.4 8.5 9.3 P010: 5.1 5.7 6.3 7.2 8.5 7.5 6.6 5.1 4.3 5.5 5.9 6.5 P100: 0.7 0.7 1.2 0.8 1.9 0.9 1.2 1.0 0.8 0.9 0.8 0.6 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 43.95 inches Days precipitation at or above 0 inches (P000): 108.5 Days precipitation at or above 0.10 inches (P010): 74.2 Days Precipitation at or above 1.00 inches (P100): 11.5 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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