Official 1981-2010 Climate Normals City: WAUKEGAN State: IL ID: 119029 Latitude: 42.3492 Longitude: -87.8828 Elevation: 700.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 29.9 34.1 44.0 55.9 66.5 77.0 81.4 80.0 73.0 61.0 47.5 34.2 Mean: 22.5 26.5 35.9 46.9 56.8 67.0 72.3 71.3 63.4 51.6 39.8 27.3 Low: 15.1 18.9 27.8 37.8 47.0 57.1 63.2 62.7 53.8 42.3 32.1 20.4 CDD: 0 0 1 9 34 133 237 212 75 7 0 0 HDD: 1317 1078 903 553 290 72 11 15 124 421 756 1168 Number of Days T090: 0.0 0.0 0.0 0.0 0.6 2.1 4.1 2.9 0.5 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 T000: 4.9 2.2 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.8 T032: 28.6 24.7 21.2 7.3 0.7 0.0 0.0 0.0 0.0 3.2 14.4 26.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 57.1 F Mean Temp: 48.5 F Low Temp: 39.9 F Cooling DD: 708 Heating DD: 6708 Days above 90 (T090): 10.2 Days above 100 (T100): 0.3 Days below 0 (T000): 9.2 Days below 32 (T032): 126.3 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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